Study on plant fiber/plastic composites as the substrate of floorboard

Three kinds of composites （fiber/Polypropylene, fiber/Polyethelene, and fiber/Polystyrene） were made by using hot pressing process for substrate of floorboard and the properties of each kind of composites were tested. MORs of PP/wood fiber, PS/fiber, and PE/fiber composites with coupling agent added were raised by 18.4%, 37.1%, and 42%. respectively, compared to those without coupling agent. Among the three kinds of fiber/plastic composites, fiber/PP composite has best mechanical properties, and it can meet quality standard of eligible grade product and come up to the excellent grade products of China when the coupling agent is added. The performance of composite made of PE/fiber or PS/fiber can exceed qualified product grade only with coupling agent added.

Effect of Plant Fiber-Polyacrylamide Blend on Retention and Evaporation Water at Arid and Semi-Arid Soils of Algeria

Soil and water conservation is essential for sustaining food production and for preserving the environment in arid and semi arid lands （ASALs） where conditions for agriculture and other land use systems are often harsh and unpredictable. The ASALs of Algeria are an important source of a variety of non wood forest products like Stipa tenacissima L. plant （esparto grass）. This research was conducted to determine the effects of different low concentration （〈 I%） polyacrylaJnide, Stipa tenacissima L. fiber （esparto grass fibers） and its mixtures with the polymer at water retention in arid and semi arid soil. All samples are characterized by infrared spectroscopy, X-ray Diffractometry, thermal analysis TG DSC and scanning electron micrographs （SEM）. The results showed that polymer blend in soil could improve better soil physical proprieties decreased evaporation and increase water retention in arid soils compared with application of any other blend at the same concentration. The use of Polyacrylamide-Cellulose blend appears to promise for reducing the labor cost of irrigation at arid and semi-arid soils, and offers safe and environmentally friendly inexpensive materials. The importance of Polyacrylamide-Cellulose blends to alleviate poor physical properties and retain water in these arid regions to sustain plant growth.

Enhancement of Dimensional Stability of Rigid PVC Foams Using E-Glass Fibers

Short cut E-glass fibers of two different lengths were used to determine the effect of glass fiber length on the dimensional stability of rigid Polyvinyl Chloride (PVC) foam in this study. Glass fibers measuring, 1/16" and 1/32" at different concentrations (0 wt% - 20 wt%) were used to reinforce rigid PVC foams;the PVC foam-glass fiber (PVC-GF) composites were extruded using a single screw profile extruder. The extruded PVC-GF composites were characterized for their dimensional stability, structural, thermal, and mechanical properties. Experimental results show that the dimensional stability, heat resistance, and storage modulus were enhanced without compromising the tensile and flexural strengths of the composites. Thermal shrinkage decreased by almost 55% in composites reinforced with 1/32" GF and by 60% in composites reinforced with 1/16" GFs, with visible improvements to the shape distortion. Overall, foam composites which were prepared with longer (1/16") glass fibers exhibited better mechanical and thermal properties than those prepared with shorter (1/32") glass fibers. Microstructural observations suggest that this is due to better interlocking between the long fibers and the foam cells, which result in better load distribution in the matrix.

Effects of planting dates and shading on carbohydrate content,yield,and fiber quality in cotton with respect to fruiting positions

Two cotton（Gossypium hirsutum L.） cultivars, Kemian 1（cool temperature-tolerant） and Sumian 15（cool temperaturesensitive） were used to study the effects of cool temperature on carbohydrates, yield, and fiber quality in cotton bolls located at different fruiting positions（FP）. Cool temperatures were created using late planting and low light. The experiment was conducted in 2010 and 2011 using two planting dates（OPD, the optimized planting date, 25 April; LPD, the late planting date, 10 June） and two shading levels of crop relative light rate（CRLR, 100 and 60%）. Compared with fruiting position 1（FP1）, cotton yield and yield components（fiber quality, leaf sucrose and starch content, and fiber cellulose） were all decreased on FP3 under all treatments. Compared with OPD-CRLR 100%, other treatments（OPD-CRLR 60%, LPD-CRLR 100%, and LPD-CRLR 60%） had significantly decreased lint yield at both FPs of both cultivars, but especially at FP3 and in Sumian 15; this decrease was mainly caused by a large decline in boll number. All fiber quality indices decreased under late planting and shading except fiber length at FP1 with OPD-CRLR 60%, and a greater reduction was observed at FP3 and in Sumian 15. Sucrose content of the subtending leaf and fiber increased under LPD compared to OPD, whereas it decreased under CRLR 60% compared to CRLR 100%, which led to decreased fiber cellulose content. Therefore, shading primarily decreased the ＂source＂ sucrose content in the subtending leaf whereas late planting diminished translocation of sucrose towards cotton fiber. Notably, as planting date was delayed and light was decreased, more carbohydrates were distributed to leaf and bolls at FP1 than those at FP3, resulting in higher yield and better fiber quality at FP1, and a higher proportion of bolls and carbohydrates allocated at FP3 of Kemian 1 compared to that of Sumian 15. In conclusion, cotton yield and fiber quality were reduced less at FP1 compared to those at FP3 under low temperature and low light conditions. Thus, reduced cotton yield and fiber quality loss can be minimized by selecting low temperature tolerant cultivars under both low temperature and light conditions.

纺膜参数对PVC中空纤维膜结构与性能的影响

以聚氯乙烯(PVC)和醋酸纤维素(CA)为膜材料,采用非溶剂致相分离(NIPS)法,通过改变纺膜参数制备了PVC中空纤维膜.结果表明:所制得的中空纤维膜具有致密皮层,断面为海绵孔与指状孔共存结构,纯水通量可达314 L/(m^(2)·h),BSA截留率可达95.0%,断裂强度22 MPa.此外,细中空纤维膜可在0.6 MPa压力以下稳定运行,并可对自来水中的有机物深度脱除49.30%.

Responses of radial growth, wood density and fiber traits to planting space in poplar plantations at a lowland site

Poplar is raw material for various panel, paper and fiber products. The 12 sample trees of clone Nanlin-895 from four spacings were destructively harvested after thirteen growing seasons to assess the influence of spacing on radial growth and wood properties. Spacing significantly affected tree-ring width and wood basic density (p < 0.05) but not fiber traits. The highest diameter and wood basic density at breast height (1.3 m) was in 6 m × 6 m and 3 m × 8 m spacings, respectively. However, no significant differences in tree-ring width, wood basic density and fiber traits were observed among the four sampling directions in discs taken at 1.3 m for each spacing. Growth rings from the pith and tree heights had significant effects on wood basic density and fiber anatomical characteristics, highlighting obvious temporal-spatial variations. Pearson correlation analysis showed a significantly negative relationship of tree-ring width to wood basic density, fiber length and fiber width, but a significantly positive relationship to hemicellulose. There was no relationship with cellulose and lignin contents. Based on a comprehensive assessment by the TOPSIS method, the 6 m × 6 m spacing is recommended for producing wood fiber at similar sites in the future.

基于Plant Simulation的化纤自动落丝系统仿真实验分析

基于Plant Simulation软件,构建一种化纤自动落丝系统的3D数字化模型,对系统效率关键输入因子进行参数化设置,将系统各工位三维数字模型导入软件中建立层次化运动机构图形结构,并运用Simltalk语言实现三维动作仿真,通过基础物理参数设置,保证了仿真数字化模型与现实系统更具一致性。通过多级实验设计分析了系统影响因子对于系统效率的影响特性曲线,并进一步通过动态参数化实验方法,计算出双输入因子对系统效能影响的敏感度。该实验结果可为化纤自动落丝系统的建设成本控制与可行性分析提供指导,具有较好的工程应用价值。

Influence of Some Plant Fibers on the Mechanical Performance of Composite Materials

This work focused on the search for biobased materials capable of being used in road techniques as soil inclusions, and on studying the influence of their incorporation on the characteristic parameters of pavement layers. To this end, pineapple, cyperus and imperata plant fibers, due to their endemic availability, were used as reinforcement on sourced materials, notably bar soil, lateritic gravel and silty sand. Complete identification and mechanical tests (Proctor and CBR) were carried out on materials in their natural state (soil) and on composite materials (soil + plant fibers) in the laboratory to determine their classification in road geotechnics, their compaction parameters and their mechanical behavior. Firstly, the various types of 2.5 cm long fibers were incorporated into the different types of soil at mass contents of 1% and 2%. This part of the study showed that the pineapple fiber composite incorporated into class A2 bar soil offered the best results, with a 38% gain in CBR index compared with the natural soil. Pineapple fibers incorporated at 1% in lateritic gravel raise the CBR value of the reinforced soil to 10% of the CBR value of the natural soil and to 7% for silty sand.

BFRP条带-PVC管材复合加固纤维再生混凝土短柱轴压性能

为了研究BFRP条带-PVC管材复合加固纤维再生混凝土短柱的轴心抗压性能,对13组再生混凝土短柱进行了轴压试验和理论分析。主要研究变量为BFRP条带层数(0层、1层、3层)、BFRP间距(25 mm、37.5 mm和50 mm)和加固方式(无侧向约束、BFRP条带加固和BFRP条带-PVC管材复合加固)。研究结果表明:BFRP条带-PVC管复合加固不仅可以提高试件的极限承载力,还可以改善纤维再生混凝土短柱的破坏形态。在应力-应变曲线的非线性强化阶段,加固方式对试件刚度的影响更为显著。随着BFRP包裹量的增加,试件的峰值应力和极限应变均明显增加。依据试验数据建立的软化段的应力-应变计算模型具有较好的适用性。

Fiber from Plants,Not Petroleum

Sweetcorn and sugar are no longer just used to feed your appetite, they have joined the team of ‘green re- sources’ and instead of oil, the food farmily is paving its way to achieve a zero-waste revolution.

Effects of High Plant Protein and High Soluble Fiber Beverages on Satiety, Appetite Control and Subsequent Food Intake in Healthy Men

Plant based proteins and fibers are attractive ingredients for weight management-dietary preventive strategies due to their positive satiety enhancement effects. The objective of this study was to evaluate the effect of beverages high in plant-protein and soluble fiber on satiety, appetite, hunger and subsequent food intake in healthy young men. This was a randomized crossover study with 30 normal weight male participants, BMI 23.6 ± 1.6 and age 22 ± 1.4. Volunteers consumed one high carbohydrates control (B) and 3 treatments on different days with 3-day washout period. Beverages had similar viscosity and energy content (238 ± 3.8 Kcal). The blank contained (B)-0 g protein/2g fiber), High protein (HP)-30 g protein/2g fiber, High Fiber (HF)-0 g protein/11g fiber and High protein high fiber beverage (HPHF)-30g protein/11g fiber. Visual Analogue Scales VAS were used for subjective satiety, hunger and appetite. Subsequent energy and macronutrient intake was measured by difference after consuming lunch ad libitum. Beverages HP, HF and HPHF showed higher satiety effect than B after 2 and 3 hours post consumption (P = 0.02). HP showed the most prolonged effect on satiety (4 h) compared to the control (P = 0.02). Appetite control was not different between treatments but significant differences were observed against the control after 2 h of consumption (P = 0.01). No differences on hunger perception, subsequent energy or macronutrient intake were observed among all beverages (P > 0.05). The current study demonstrates that HPHF, HP and HF beverages led to improved satiety over high carbohydrate beverages. In conclusion, beverages formulated with plant-based proteins, soluble corn fiber or both may be an effective strategy to promote satiety as part of an overall weight management plan.

Toxic Gas Put 161 Workers of Jilin Chemical Fiber Plant in Hospital

A news briefing held on May 13 by local government in Jilin city of Jilin province released that 161 workers got sick symptoms as a result of their contact with an unidentified gas emitting from Jilin Chemical Fiber Group Corp.

PVC离心母液水膜法过滤回收利用工艺研究

目的探究膜法过滤技术在氯碱厂PVC离心母液水回收利用工艺中的应用,提高PVC离心母液水的回收利用率,降低悬浮物和化学需氧量。方法对PVC离心母液水进行预处理,去除其中杂质和悬浮物,将预处理后的母液水通过真空泵从膜组件的进料口输入,利用超滤膜过滤系统对其进行过滤,并对过滤后的透过液进行后处理。对后处理的溶液进行水质检测,并统计检测结果。结果利用膜法过滤技术对PVC离心母液水进行过滤后,PVC离心母液水的pH值为7.1~7.2,符合工业用水标准,悬浮物为1.10mg·L^(-1),COD为45.23mg·L^(-1),氯化物为41.23mg·L^(-1),硫酸盐为45.15mg·L^(-1),HCl为0.12mg·L^(-1),电导率为500μS·cm^(-1),浊度为1.5NTU。结论膜法过滤技术在氯碱厂PVC离心母液水回收利用中应用性能较好,有效提升了氯碱厂PVC离心母液水回收利用的效果。

PVC防水卷材在广州五羊本田屋面维修改造工程中的应用

广州五羊本田摩托轻钢结构厂房建于2005年,经过近20年使用,彩钢板屋面及气楼出现锈蚀和渗漏情况,需要做防腐蚀和防水修缮等维修改造。本项目采用在处理后的彩钢板基层上使用专用胶粘剂满粘单层PVC防水卷材的工艺,满足了翻新屋面的防水要求。本文重点介绍了PVC防水卷材在该屋面修缮工程中应用时各细部节点的设计做法。

剑麻纤维与玻纤混杂增强PVC复合材料的性能研究

本文介绍采用短麻纤维(SF)和短玻纤(GF)混杂增强PVC基体,测定了复合材料的弯曲强度、弯曲模量、无缺口冲击强度以及耐水浸泡性能,并探讨了这一复合材料在水浸泡前后的力学性能及其界面行为.结果表明,此种复合材料在弯曲模量和无缺口冲击强度上存在正的混杂效应,而弯曲强度存在负的混杂效应;经水浸泡后,复合材料的弯曲强度、弯曲摸量和冲击强度都有不同程度的下降,而对于纯PVC基体,水浸泡后的弯曲强度和弯曲模量反而有所提高,因此可以认为,水浸泡对纯PVC基体在弯曲性能方面无不良影响,水分主要对纤维与基体的界面产生不良作用,导致复合材料性能下降.

植物纤维/PVC木塑复合材料制备及其性能分析

木塑复合材料是一种各项性能都较好的复合材料,应用价值较高。木塑复合材料是在助剂的作用下,将塑料和植物纤维混合在一起,然后应用相应的加工工艺对其进行加工所得到的一种材料。该材料当前主要问题就是材料和树脂基体之间的界面结合性较差,只有有效提高两种材料的相容性,才能有效推动木塑产业的进步。文章详尽的分析并探讨了植物纤维/PVC木塑复合材料具体制备流程及其具备的性能。

PVC/粉煤灰/玻璃纤维复合材料力学性能的研究

采用粉煤灰填充PVC,并添加玻璃纤维对复合材料进行增强。结果表明:在PVC中填加未经处理的粉煤灰后,体系力学性能随粉煤灰含量的增加而下降。用硅烷偶联剂和硬脂酸对粉煤灰进行表面处理后,共混体系的力学性能有所提高,且硅烷的处理效果要好一些。用玻璃纤维对该复合体系进行补强,填充量为8phr时,补强效果最佳。

改性木粉/PVC复合材料的研究进展

概述了PVC木塑复合材料的发展和背景与性能。简述了木质材料的性质和木粉改性的方法,如物理方法和化学方法。介绍了木塑复合材料的生产流程、成型方法(模压成型、挤出成型、注射成型及其成型设备,讨论了对工艺参数的一些要求。指出目前国内PVC木塑复合材料发展存在的一些问题,并指明了PVC木塑复合材料的应用前景。

短纤维增强PVC的力学性能研究

本文讨论了模压成型制成的短纤维增强PVC的制备方法和力学性能,主要探讨了纤维含量、纤维长度、混杂纤维效应等对复合材料拉伸、弯曲和冲击性能的影响。

PVC/木纤维微孔发泡技术的研究

国外实验研究已经证明 ,利用PVC/纤维素纤维复合材料能够产生微孔发泡结构 ,但发泡率较低。多种因素如PVC、纤维素纤维的改性处理、加工条件等都将影响泡孔形态与制品的物理机械性能。本文针对PVC/木纤维复合材料 ,研究材料中增塑剂含量、表面改性处理、发泡时间、发泡温度等条件对发泡率、泡孔形态及制品物理机械性能的影响 ,以建立加工条件、泡孔形态、制品性能之间的关系。