Characteristics of Coaxial Dielectric Barrier Discharge at an Atmospheric Pressure with a Swirling Gas Argon/Oxygen Mixture for the Surface Modification of Polyester Fiber Cord

Abstract A newly developed coaxial dielectric barrier discharge reactor with a length of 1000 mm at an atmospheric pressure was used for plasma treatment of polyester fiber cord in a roll-to-roll manner. In this reactor, swirling mixture gases of oxygen of about 1% and argon with a flow rate of 1.5 L/rain to 2.7 L/min ensured the gas usage sparing, discharge uniformity and efficient fiber surface modification. The water contact angle and surface morphology of the treated fiber were measured. The results show that the surface oxygenation is mainly responsible for the wettability improvement of the fiber cord when passing through the plasma zone at a linear speed of 3 m/min to 8 m/rain. The specimens of modified-polyester fiber reinforced rubber composite were also prepared for the interracial shear strength tests. Furthermore, the effect of adding oxygen into argon discharge on the fiber surface oxidation was correlated with optical emission spectroscopy. Finally, the effect of adding oxygen into argon discharge on the kinetic processes of the active species generation were also analyzed.

Influence of Thermal Treatment on the Structure and Thermal Properties of Kaolin Modified Polyester Fibers

Modified polyester fibers were obtained using 2% and 6% of kaolin blends through melt spinning.The influences of two thermal treatments maintaining the original tension(180 ℃×2 min and 200 ℃×1 min)on the structure and properties of fiber were compared.The changes of grain size and crystallinity of fiber were investigated by X-ray diffraction(XRD).The changes of thermal properties of fibers were analyzed using dynamic mechanical analyzer(DMA).The results show that the crystalline structure of kaolin modified polyester fiber doesn't change with the thermal treatment.With the kaolin content increasing,the grain size of fiber changed.The higher the thermal treatment temperature is,the higher the crystallinity of fiber is.There are two glass-transition temperatures for kaolin modified:the lower one is the glass-transition temperature of polyester fiber matrix,and the higher one is derived from the heterogeneous blend of polyester matrix and nano kaolin.The higher the kaolin content is,the higher the glass-transition temperature is.Thermal treatment could increase the compatibility of polyester matrix and nano kaolin.There was only one glass-transition temperature for the thermal treatment fiber,and the heat resistance of fiber was improved.Thermogravimetric analysis-differential scanning calorimetry(TGA-DSC)results of kaolin modified polyethylene terephthalate(PET)matrix indicate that the decomposition temperature of PET fibers,kaolin modified PET fibers,and thermal treated fibers were little different within 40%-60% of weight loss rate range.

KINETICS AND MECHANISM RELATING ALKALINE HYDROLYSIS OF POLYESTER BLEND FIBER

Cation Dyeable Polyester(CDP)was made by copolymerizing dimethyl terephthalate(DMT),S-sodium sulfonate dimethyl isophthalate(SIPM) with a weight fraction of 4.5% and ethyleneglycol (EG).Blend of PET and CDP was spun into hollow fiber.The fiber was then treated withaqueous NaOH.In this paper,kinetics and mechanism of alkaline hydrolysis of PET,CDP andtheir blend PET/CDP fiber were studied by means of specific area measurement,scantling elec-tron microscopy and other chemical analyses.It was showed that the rate of alkaline hydrolysis isCDP】PET/CDP】PET.Because of blending effect,the alkaline hydrolysis of PET/CDP is dif-ferent from that of PET.CDP phase in the PET/CDP fiber is predominantly hydrolyzed,andhence some pieces of fiber(micro-fiber) fall off the fiber because of etching.

AN INVESTIGATION ON TENSILE FRACTURE FEATURE FOR THREE KINDS OF POLYESTER FIBERS

This paper deals with the fracture feature of three kinds of polyester fibers with differentstructures under different tensile conditions.We studied fracture initiation,crack propagationand ultimate fracture characteristics under tension of polyester fibers.The fracture features ofpolyester fibers are related with fiber structure and tensile condition.Crack is initiated in fibersurface.It propagates from outside to inside and eventually causes rupture of the fiber.In addi-tion,it is stated also that the analysis on tensile fracture feature of fibers might be confirmed bydynamic testing technique of scanning electron microscopy.

Morphology and Thermal Behavior of Polypropylene/Easily Hydrodegraded Polyester Blend Fibers

Ultrafine polypropylene fibers are prepared frompolypropylene/easily hydro - degraded polyester （PP/EHDPET） blend fibers, in which file EHDPET compo-nent is degradable by treating with NaOH - H2O solu-tion. We investigated the morphology of PP/EHDPETblend fibers before and after stretching and alkalinehydrolysis. Then thermal behavior of the blend has alsobeen studied.

Influence of Fiber Properties and Processing Parameters on Properties of Highloft Nonwoven Bonded by Bicomponent Polyester Fibers

Highloft nonwoven was produced by heat bonding of bicomponent polyester fibers. The effect of fiber properties and processing parameters on the mechanical properties of the nonwoven was investigated. The heat bonding processing parameters for the nonwoven were optimized. The results show that the range of processing temperature is wider while the shell melting point of the bicomponent fibers (Tm1) is lower. The best processing temperature is about 15℃ higher than Tm1 while the shell melting point (Tm1) is higher.

Decorative Wood Fiber/High-Density Polyethylene Composite with Canvas or Polyester Fabric

Wood-plastic composite is an environmentally friendly material,due to its use of recycled thermoplastics and plant fibers.However,its surface lacks attractive aesthetic qualities.In this paper,a method of decorating wood fiber/high-density polyethylene(WF/HDPE)without adding adhesive was explored.Canvas or polyester fabrics were selected as the surface decoration materials.The influence of hot-pressing temperature and WF/HDPE ratio on the adhesion was studied.The surface bonding strength,water resistance,and surface color were evaluated,and observation within the infrared spectrum and under scanning electron microscopy was used to analyze the bonding process.The results showed that the fabric and WF/HDPE substrate could be closely laminated together depending on the HDPE layer accumulated on the WF/HDPE surface.The molten HDPE matrix penetrates canvas more easily than polyester fabric,and the canvasveneered composite shows a greater bonding strength than does the polyester fabric-veneered composite.A higher proportion of the thermoplastic component in the substrate improved the bonding.When the hot-pressing temperature exceeded 160°C,the fabric-veneered WF/HDPE panels had greater water resistance,although the canvas fabric changed more obviously in terms of fiber shape and color,compared with the polyester fabric.For the canvas fabric,140°C–160°C was a suitable hot-pressing temperature,whereas 160°C–180°C was more suitable for polyester fabric.The proportion of the thermoplastic component in the composite should be not less than 30%to achieve adequate bonding strength.

Mechanical Properties of Glass Fiber/Unsaturated Polyester Resin Composite Water Collector

The water collector is operated in the humid and hot environment of the cooling tower all the year round.It also needs to carry part of the weight of water and silt.Therefore,it is particularly critical to optimize the material of the water collector and improve its mechanical properties.Polyester,a general term of polymer obtained from polyols and polyacids,is a kind of engineering plastics with excellent properties and wide applications.Glass fiber is a reinforced plastic reinforcement material,and the biggest characteristic of it is the high tensile strength and good heat resistance.In this paper,glass fiber reinforced polyester resin composite material is prepared,its tensile properties and bending properties are tested,and the performance of the imported material JK2020B is compared and analyzed.The results show that the elastic modulus along the fiber direction is relatively high,but the interlayer force in the direction of thickness and width is very small.This review provides a guidance for production process.

Identification of Silver Nanoparticles on Polyester Fiber on Raman Spectrograms of the in the Conditions of Information Uncertainty

The paper shows the results of method development identification of colloidal silver nanoparticles on the components of the Raman spectra, using the conditions information uncertainty decision to increase the reliability evaluating the presence nanoparticles at the surface polyester fibers.

Removal of Surface Oligomers from Polyester Fiber by an Ul-trasonic / Alkali System

The removal of surface oligomers from polyester fiber was investigated by an Ultrasonic / Alkali System.Effects of concentration of alkali, temperature, time and ultrasonic frequency were discussed. It was found that Ultrasonic / Alkali System could decrease remarkably surface oligomers content of polyester fiber dyed by HIP without influencing the dyeing properties of the fiber.

Influence of Polyester Resin Treatment on Jute Fabrics for Geotextile Applications

In this study, jute woven fabrics (1 × 1 plain, twill, zigzag and diamond weave) were manufactured from 100% raw jute yarn. The fabric specimens were treated by 5%, 10%, 15%, 20% and 25% unsaturated polyester resin where styrene monomer used as a solvent and 1% methyl ethyl ketone peroxide (MEKP) was used as initiator. Two bar pressure was applied for complete wetting of the fabric by a Padder and curing was done at 130?C for 10 minutes. The physico-mechanical characteristics of untreated and treated samples were examined and evaluated. It was revealed that moisture content (MC) and water absorbency of the treated specimens were decreased with the increase of resin percentage (%) in the fabrics. MC and water absorbency were maximum decreased up to 50.23% and 60.14% respectively by 25% resin treatment. On the other hand, bending length (BL), flexural rigidity (FR), flexural modulus (FM) and tensile strength (TS) were enhanced with the increase of resin percentage in the fabrics which resulted higher fabric stiffness. The maximum improvement of BL, FR, FM and TS were found to be 6.67%, 56.04%, 10.57% and 18.75% respectively in comparison to untreated sample. Soil degradation tests exhibited that 33.59% TS loss occurred for untreated specimens where only 8.04% loss of TS found for 25% resin treated one. Furthermore, jute based twill, zigzag and diamond fabrics were also treated by 10%, 15%, 20% and 25% resin, then measured their TS and compared with plain fabrics. It was revealed that plain fabrics have superior TS over other fabrics. It was also evident that TS enhanced for all the fabrics after resin treatment and maximum increase found for all the fabrics up to 25% resin treatment.

Synthesis and Application of Easy Hydrolysis Degradable Polyester

An easy hydrolysis degradable polyester (EHDP) is synthesized; the fiber produced from which can be hydrolyzed by dilute basic solution easily. The properties of these kind polyesters are measured. The results show that this kind polymer is suitable to be spun into filament The EHDP can be spun into staple fiber and manufactured into non-woven fabric. This fabric is used as disposable clothes. In composite spinning, the PET (polyethylen glycol terephthalate) or PA (polyamide) is used as continuous phase, and EHDP used as dispersed phase. Then the fabric of this kind fiber is treated by basic solution; the ultra-fine fiber fabric is obtained.The fineness of the fiber is about 0.045 dtex. In blend spinning, EHDP is mixed with polypropylene (PP) to produce hollow fiber with micro-holes in radical direction. This fiber is a usable material in filter especially in medical use.

Biodegradable Behavior of Waste Wool and Their Recycled Polyester Preforms in Aqueous and Soil Conditions

Present study deals with the biodegradable behavior of individual components and their preforms of nonwoven biocomposites developed from waste wool fibers including coring wool(CW),dorper wool(DW)and recycled polyester fibers(RPET).A respirometric technique was employed to estimate the production of CO_(2) during the biodegradation experiments under soil and aqueous media conditions.Functional groups of test samples before and after biodegradation were analyzed using Fourier transform infrared spectroscopy(FTIR).Leaching chemicals such as formaldehyde(hydrolyzed)and Chromium VI(Cr VI)was also measured.The CO_(2) emission in wool fibers CW and DW indicated 90%and 60%biodegradation in soil burial and aqueous media conditions respectively,for 100 days incubation.RPET fibers,20%and 10%biodegradation in soil burial and aqueous media conditions was measured respectively while the preforms of waste wool and RPET reflected 30%and 25%biodegradation in soil burial and aqueous media conditions,respectively.The degradation of end functional groups such as carbonyl(keto and ester),aldehyde and hydroxyl were also confirmed by FTIR.The DW and CW wool fibers showed higher Cr(VI)concentration as compared to the RPET.The released formaldehyde results showed higher concentration for RPET preforms as compared to waste wool preforms.These results suggest that waste wool preforms are extremely environment friendly as compared to RPET preforms.Thus,waste wool preforms it can be potentially utilized for preparing biocomposite materials and associated biobased products.

Humidity Diffusion on Jute/Polyester Laminated Composites and Its Effects on Mechanical Properties

Jute is a natural fiber widely used as reinforcement in composites due to its high tensile strength and stiffness,but they can easily absorb water and have their physical properties compromised.The water absorption properties of jute/polyester composites are evaluated according to ASTM D 570 and the effect of humidity in the composite mechanical behavior is also analyzed.The composite showed a pseudo-Fickian behavior and gained 13.37%in weight after the test.It also lost tensile strength and elasticity modulus,and increased its specific deformation.Scanning electron microscope images showed that wet specimens were more subject to cracks,voids and fiber pullout than dry specimens.Failures produced by water diffusion in composite and polymer plasticization,added to breakdown in the fibers’cellulosic structures,justify the change in mechanical properties due to water absorption.

The Effect of Desizing and Scouring with Enzyme on Grooved Polyester/Cotton Denim

The denim woven by cotton and grooved polyester fiber (Coolcool) is desized by amylase and scouring enzyme. The technological parameters are discussed,such as concentrations of amylase and compound enzyme HK,time,temperature,and pH value. The technical conditions are optimized through experimental analysis. This eco-finishing process is very helpful to improve the denim production and the performance of moisture absorption and sweat transmission function.

中国废旧军服面料回收利用的研究现状及发展前景

为促进废旧军服面料的高值化回收利用,总结了国内07式军服的种类及其面料特征,系统分析了目前开纤纺纱法、再生聚酯切片法、涤棉分离技术等废旧军服面料的回收利用方法,并对废旧军服面料回收再利用的发展前景进行展望。分析表明:目前废旧军服面料的回收利用主要聚焦于简单再利用或回收涤纶组分制备高值再生聚酯切片,较少关注军服面料中其余组分的高值回收利用。针对废旧军服面料中含量相对较高的涤棉混纺面料,采用有效的涤棉分离技术高效分离涤纶和棉纤维,并以此作为原料分别制备再生聚酯切片和再生溶解浆,进一步以再生棉浆粕为原料制备再生纤维素产品将非常有前景。因而,开发高效的涤棉分离、废旧涤纶和棉纤维的高值化利用技术是实现废旧军服面料综合利用的重要发展方向。

聚酯纤维泡沫混凝土力学性能及孔结构研究

纤维的掺加可有效地改善泡沫混凝土抗压强度低、脆性特征显著的缺陷,增强其工程适用性。本工作针对聚酯纤维对泡沫混凝土力学性能的改善开展试验研究,选定密度等级为700 kg/m3的泡沫混凝土,考虑不同纤维体积掺量(0.1%、0.2%、0.3%和0.4%)对其抗压强度、抗折强度、劈裂抗拉强度以及延性的影响。结果表明:纤维掺量为0.1%时,材料表现出较优的抗压和劈裂抗拉性能,28 d强度分别增加了86.4%和91.3%;纤维掺量为0.2%时,材料表现出较优的抗折性能,28 d抗折强度提升了39.1%。试样破坏形态和应力-应变曲线表明,聚酯纤维可有效地提升泡沫混凝土的延性。最后,运用图像分析处理法分别获得了五组试件的孔结构参数,从细观孔结构的角度讨论了聚酯纤维对泡沫混凝土抗压强度的影响机理。

碱溶性聚酯/碳酸钙/聚酯(COPET/CaCO_(3)/PET)多孔纤维制备及性能研究

采用自制的碱溶性聚酯/碳酸钙(COPET/CaCO_(3))母粒与聚酯(PET)母粒,经熔融纺丝实现对传统PET纤维的改性,结合单因子控制变量法优选碱酸处理制备COPET/CaCO_(3)/PET多孔纤维的最佳工艺参数,并对纤维性能进行测试与表征。结果表明,当NaOH质量分数为4%、HCL质量分数为3%时,纤维具有较好的表观形态和孔隙结构。在最优处理条件下,纤维内部含有较多分布均匀的孔隙,孔径主要集中分布在15~54nm。此时,纤维的断裂强度、线密度、比表面积和熔融温度分别为1.29cN/dtex、4.84dtex、5.5273m^(2)/g和253.85℃。

一种氧化锌复合物抗菌纺织纤维材料制备及性能测试

为降低抗菌材料生物毒性,提高其抗菌性能,本试验先通过原位还原法制备氧化锌复合物,并以该复合物作为抑菌剂,结合聚酯纤维无纺布制备一种抗菌纺织纤维材料,并研究其性能。试验结果表明,当氧化锌复合物中Cu含量在4.5%以上时,抗菌纺织纤维材料抑菌率基本达到99%,抗菌性能良好;在经过50次2 g/L的AATCC 1993标准洗涤剂洗涤后,抗菌纺织纤维材料抑菌率为97.6%,耐水洗性能良好;在经过12 h、24 h细胞培养后,抗菌纺织纤维材料的细胞相对存活率分别是86.6%、85.1%,生物相容性良好。综上,该抗菌纺织纤维材料综合性能良好,具备应用价值。

体育服饰用超细纤维合成革针刺非织造基布的力学性能表征

为有效解决开纤处理后海岛超细纤维针刺非织造基布致密性低且针刺痕迹等一系列问题,以促使其在体育服饰用超细纤维合成革中广泛应用,本文基于针刺法将高收缩聚酯纤维掺入海岛超细纤维合成革非织造基布,以制备生成了超细纤维合成革针刺非织造基布,并对其力学性能进行了测试表征。结果发现,随着高收缩聚酯纤维掺入量增加,超细纤维合成革针刺非织造基布断裂强度与撕裂强度皆逐渐增大;透湿性与吸湿性先降低后升高;热收缩率逐步增高;耐磨性逐渐提升,且基布均匀度较好;弯曲长度与弯曲刚度皆逐渐增大,柔软度随之降低;以针刺非织造基布为原料制成的体育服饰用超细纤维合成革表面平整且光滑,底面平整且粗糙度适中,致密性较好,且断裂强度、撕裂强度、透湿性与吸水性均表现优异。