Synthesis of a Novel UV-curable Prepolymer Polypropyleneglycol Diglycidyl Ether Diacrylate

A novel UV-curable prepolymer polypropyleneglycol diglycidyl ether diacrylate （PPGGEA） was synthesized by utilizing polypropyleneglycol diglycidyl ether （PPGGE） and acrylic acid （AA） as starting materials, N, N-dimethylbenzylamine as catalyst and p-hydroxyanisole as inhibitor. The optimum synthetic conditions were in the following： the concentration of N, N-dimethylbenzylamine was 0.80 wt% of reactants, the concentration of p-hydroxyanisole was 0.3 wt% of reactants, the reaction temperature was 90-110 ~C, and the molar ratio of PPGGE to AA was 1：2.2. Meanwhile, 1-hydroxycyclohexyl phenyl ketone of a UV-cured initiator was added to the synthesized PPGGEA to prepare a kind of UV-cured coating. The mechanical properties of the UV-cured films were determined, giving 29.99 MPa of tensile strength, 834.27 MPa of the Young＇s modulus and 5.66% of elongation at tear.

Preparation and Characterization of Carboxyl-terminated Poly(butadiene-co-acrylonitrile)-epoxy Resin Prepolymers for Fusion-bonded-epoxy Powder Coating

Liquid carboxyl-terminated poly（butadiene-co-acrylonitrile）（CTBN）-epoxy resin（EP） prepolymers were prepared with different contents of CTBN.The chemical reactions between EP and CTBN were characterized by Fourier ransform infrared（FTIR） spectroscopy and gel permeation chromatography（GPC）.The scanning electron micrograph（SEM） and dynamic mechanical analysis（DMA） of curing films showed phase separation,and the rubber particles were finely dispersed in the epoxy matrix.Mechanical properties analysis of curing films showed that impact strength and elongation at break increased significantly upon the addition of CTBN,indicating good toughness of the modified epoxy resins.Thermogravimetric analysis（TGA） showed that the incorporation of CTBN had little effect on the thermal stability of EP.Fusion-bonded-epoxy（FBE） powder coatings modified with CTBN-EP prepolymers were prepared.The experimental results demonstrate the ability of CTBN-EP prepolymers,toughening technology to dramatically enhance the flexibility and impact resistance of FBE coatings without compromising other key properties such as corrosion protection.

Synthesis and Characterization of Fluorine-containing Polyacrylate Emulsion with Core-Shell Structure

A fluorine-containing polyacrylate copolymer emulsion was synthesized by a seed emulsion polymerization method, in which methyl methacrylate （MMA） and butyl acrylate （BA） were used as main monomers and hexafluorobutyl methacrylate （HFMA） as fluorine-containing monomer. The structure and properties were characterized by Fourier transform infrared spectrum （FT-IR）, transmission electron microscopy （TEM）, particle size analysis, X-ray photoelectron spectroscopy （XPS）, contact angle （CA）, differential scanning calorimetry （DSC） and thermogravimetry （TG） analysis. The FTIR and TEM results showed that HFMA was effectively involved in the emulsion copolymerization, and the formed emulsion particles had a core-shell structure and a narrow particle size distribution. XPS and CA analysis revealed that a gradient concentration of fluorine existed in the depth profile of fluorine-containing emulsion film which was richer in fluorine and more hydrophobic in one side. DSC and TG analysis also showed that a clear core-shell structure existed in the fluorine-containing emulsion particles, and their film showed higher thermal stability than that of fluorine-free emulsion.

Synthesis of a Novel UV-curable Prepolymer Hexanediol Diglycidyl Ether Diacrylate and Its Cured Film Tensile Property

A novel UV-curable prepolymer hexanediol diglycidyl ether diacrylate （HDGEA） was synthesized by utilizing hexanediol diglycidyl ether （HDGE） and acrylic acid （AA） as starting materials, N, N-dimethylbenzylamine as catalyst and p-hydroxyanisole as inhibitor. The optimal synthetic conditions were that the concentration of N, N-dimethylbenzylamine was 0.80 wt% of reactants, the concentration of p-hydroxyanisole was 0.3 wt% of reactants, the reaction temperature was 90-110 ℃, and the molar ratio of HDGE to AA was 1︰2.2. Meanwhile, 1-hydroxycyclohexyl phenyl ketone of a UV-curing initiator was added to the synthesized HDGEA to prepare a kind of UV-curing coating. The mechanical properties of the UV-cured films were determined, giving 31.87 MPa of tensile strength, 871.88 MPa of Young＇s modulus and 6.77% of elongation at tear.

Performance of CTBN(carboxyl-terminated poly (butadiene-co-acrylonitrile))-EP(diglycidyl ether of bisphenol-A (DGEBA)) Prepolymers and CTBN-EP/polyetheramine (PEA) System

CTBN-EP prepolymers were synthesized from CTBN and epoxy resin under the catalysis of HTMAB. FTIR analyses indicate the formation of ester group between the carboxyl group of CTBN and the oxirane group of epoxy resin. The viscosity of modified prepolymer increases with CTBN content increasing, but the epoxy value of the prepolymer decreases greatly. DSC analyses verify that CTBN affects the curing process of CTBN-EP/PEA system. Mechanical testing presents the improved toughness of CTBN-EP/PEA curings for the decrease of tensile strength, flexural strength and compressive strength, and increase of impact strength and elongation-at-break with the CTBN content increasing. SEM micrographs show the rubber phase with many holes in diameter about 0.5-1.5 μm is formed when CTBN content is lower than 10 phr. However, the pattern of SEM graph shows some stalactite-like strips when CTBN content is higher than 15 phr. Furthermore, the SEM image of 25 phr CTBN sample forms a kind of co-continuous structure.

Research progress on preparation and purification of fluorine-containing chemicals in lithium-ion batteries

With the development of digital products,electric vehicles and energy storage technology,electronic chemicals play an increasingly prominent role in the field of new energy such as lithium-ion batteries.Electronic chemicals have attracted extensive attention in various fields.Characteristics of high-end electronic chemicals are high purity and low impurity content,which requires a very strict separation and purification process.At present,crystallization is a key technology for their separation and purification of electronic chemicals.In this work,the representative fluorine-containing compounds in cathode and anode materials,separator and electrolyte of lithium-ion batteries are introduced.The latest technologies for the preparation and purification of four kinds of fluorine-containing battery chemicals by crystallization technology are reviewed.In addition,the research prospects and suggestions are put forward for the separation of fluorine-containing battery chemicals.

Preparation and Characterization of Phenolic Prepolymer Impregnated Chinese Fir by Cyclic Increasing-Pressure Method with Green and Efficient

The Chinese fir wood was impregnated using a cyclic increasingpressure method(CIPM)with phenolic prepolymers as the impregnating modifier.Unmodified Chinese fir and progressive increasing-pressure method(PIPM)impregnated Chinese fir were used as reference samples and were compared and analyzed.The product’s chemical structure,internal morphology,crystal structure,and heat resistance were characterized.The transversal and longitudinal sections showed better filling effects,so that it bore greater external loading and reduced the water storage space.CIPM infused more phenolic prepolymer into the Chinese fir.Not only producing more physical filling but also forming more hydrogen bond associations and chemical bond combinations.Compared with PIPM and unmodi-fied Chinese fir,the CIPM impregnated Chinese fir had better mechanical strength and water resistance.The cellulose chains in CIPM impregnated Chinese fir were more closely linked and their crystallinity were clearly improved.Changes in internal morphology and crystal structure explained the reason why the mechanical properties and water resistance of CIPM impregnated Chinese fir were improved significantly.This Chinese fir had lower thermal decomposition rates,higher decomposition residual rates,and smaller combustion flames,which confirmed that it possessed improved heat and fire resistance.

SYNTHESIS AND CHARACTERIZATION OF A NOVEL FLUORINE-CONTAINING HYDROPHOBICALLY ASSOCIATING POLYMER

In this article, the synthesis and characterization of a novel fluoromonomer and its copolymer with acrylamide is reported. 2-perfluoroamyl-4-hydroxylquinoline 2 was synthesized from ethyl 2, 2-dihydroperfluoroheptanoate in high yields. The monomer 4 was then synthesized from 2 in two steps readily in high yields. Synthesis and characterization of copolymers of acrylamide (AM) and the fluoromonomer were investigated. The composition and intrinsic viscosity of these copolymers were studied. It was found that the rheological properties of aqueous solutions of polyacrylamide were modified significantly when a small proportion of the fluoromonomer 4 was incorporated on investigating the viscosity-concentration profiles, pseudoplasticity of these solutions and the effect of the presence of surfactant. These results could be explained by the hydrophobic association of the fluorocarbon segments in the aqueous solutions of these copolymers.

Design and Synthesis of Novel Fluorine-containing Acrylates

A series of novel fluorine-containing acrylates 6a-6g were synthesized via the condensation of ethyl cyanoacetate and trifluoroacetic anhydride, followed by chloridization and the coupling reaction with amines. These new compounds exhibited some biological activity as preliminary bioassay indicated. A plausible reaction mechanism was outlined and discussed.

Michael Addition of Nitroalkanes to CF_3CCl_2COCH=CHPh: A Facile Route to Fluorine-containing γ-Nitro Ketones

Nitroalkanes react smoothly with CF_3CCl_2COCH=CHPh via Michael addition in the presence of inorganic bases such as KF/Al2O3 or K2CO3, giving fluorinecontaining γ-nitro ketones in good yields.

Synthesis of a novel UV-curable prepolymer neopentyl glycol diglycidyl ether diacrylate and its cured film tensile property

A novel UV-curable prepolymer neopentyl glycol diglycidyl ether diacrylate (NPGGEA) was synthesized by using neopentyl glycol diglycidyl ether (NPGGE) and acrylic acid (AA) as starting materials, N, N-dimethylbenzylamine as catalyst and p-hydroxyanisole as inhibitor. The optimum synthetic conditions were taken as follows: The concentration of N,N-dimethylbenzylamine, 0.80% of reactants; the concentration of p-hydroxyanisole, 0.3% of reactants; the reaction temperature, 90-110 ; the molar ratio of NPGGE to AA, 1:2.2. Meanwhile, 1-hydroxycyclohexyl phenyl ketone of a UV-cured initiator was added to the synthesized NPGGEA to prepare a kind of UV-cured coating. Mechanical properties of the UV-cured films were determined, giving 28.75 MPa of tensile strength, 923.82 MPa of Young’s modulus and 5.51% of elongation at tear.

Synthesis and Characterization of Fluorine-containing Poly(ether ether ketone)s

Poly（ether ether ketone）s（PEEK） are a class of high performance engineering thermoplastics known for their excellent thermal, mechanical, and electrical properties. This class of advanced materials has currently received considerable attention for potential application in aerospace, electronics, automobile and other high technology fields. However, it is difficult for PEEK to be processed because of their high melting temperature and poor solubility.

A CONVENIENT SYNTHESIS OF FLUORINE-CONTAINING QUINOLINES

2-Fluoroalkyl-4-hydroxy-quinolines were easily obtained from the reactions of 2-(F-alkyl)acetates with aromatic amines in the presence of Et_3N,followed by cyclization of the intermediates with PPA.

EB凹印油墨固化性能的研究

目的为了改善EB凹印油墨的固化性能,满足其在高速印刷设备上的应用需求,需要研究油墨固化性能的影响因素,并寻找影响规律。方法从预聚物种类、单体种类、预聚物与单体的比例、电子束辐射剂量、电子束辐射剂量累加5个方面对EB凹印油墨的固化性能进行研究。结果2种预聚物超支化聚酯丙烯酸酯EB150和改性环氧丙烯酸树脂6215-100可以改善油墨的固化性能;单体丙烯酰吗啉ACMO配制的油墨双键转化率高、固化速度快;双键转化率随预聚物含量的增加呈现先增加再平缓后下降的趋势,预聚物含量过多或过少都不利于油墨固化;油墨双键转化率随辐射剂量增加,呈现出先增加达到峰值后略微下降的趋势;同一辐射剂量下,累加多次可显著提高EB凹印油墨固化性能。结论预聚物、单体和辐射剂量对油墨的固化性能都有一定的影响,掌握影响规律可以获得固化性能优异的EB凹印油墨。

聚氨酯热熔胶用预聚体的合成

以二异氰酸酯和聚醚多元醇为原料,通过定时测定—NCO的含量,确定了合适的预聚反应时间和温度,制备了聚氨酯热熔胶用预聚体。对影响预聚体合成的因素:异氰酸酯的种类、—NCO的含量、水分的含量以及预聚体的贮存稳定性等进行了探讨。结果表明,最佳预聚反应条件为80℃、2 h,—NCO含量控制在9%~10%,物料中水分质量分数低于0.05%,制备的产物性能稳定。

聚氨酯预聚体中异氰酸酯基含量不确定度评价

聚氨酯被广泛应用,预聚体法是聚氨酯重要的制备方法,而异氰酸酯含量是预聚体的重要指标,尚未见到关于异氰酸酯含量不确定度评价的论文。本文根据HG/T 2409-1992测定聚氨酯预聚体中异氰酸酯基含量,按照JJF1059.1-2012对各影响因素进行分析,得到异氰酸酯基含量为(5.93%±0.12%)(k=2,置信水平95%)。通过对不确定度的评定,综合各因素对不确定度的影响,发现测量重复性引入的不确定是异氰酸酯含量测定不确定度的主要来源。

预聚体对无溶剂聚氨酯胶黏剂耐蒸煮性能的影响

本文合成了系列聚氨酯预聚体,将其用于制备双组分无溶剂聚氨酯胶黏剂,并利用红外光谱和核磁共振波谱证明预聚体和胶黏剂的结构。通过控制变量法研究了聚氨酯预聚体的异氰酸酯基质量分数(ω_(NCO))、多元醇分子量、R值(胶黏剂中-OH和-NCO基团的摩尔比)对胶黏剂黏度和耐蒸煮性能的影响。结果表明,在ω_(NCO)为17%时,预聚体黏度较低,聚氨酯胶黏剂经水煮后的剥离力较高。当ω_(NCO)一定时,随着多元醇分子量减小,预聚体黏度增大,聚氨酯胶黏剂水煮前后的剥离力增加。在多元醇分子量为1 609 g/mol,ω_(NCO)为17%,R值为2.5时,水煮前后耐蒸煮聚丙烯流延膜层剥离力最高分别达到6.30 N和4.37 N。将该预聚体与多种B组分混合获得一系列聚氨酯胶黏剂,均满足国家标准GB/T 41168-2021对铝塑复合膜耐蒸煮性能的需求。

聚己内酯聚氨酯预聚体增容壳聚糖/聚己内酯复合材料的结构与性能研究

以聚己内酯聚氨酯预聚体(PUP)为增容剂,采用熔融法制备了壳聚糖(CS)/聚己内酯(PCL)复合材料,探究了PUP含量和PCL分子量对CS/PCL复合材料结构及性能的影响。结果表明,PUP分子上的异氰酸酯基团可以与CS分子上的羟基和氨基反应形成共价键,同时PUP与PCL相似相容,通过PUP与两相的相互作用可以有效提高CS与PCL之间的界面相容性;随着PUP含量的增加,复合材料的热稳定性和力学性能增强,当PUP含量为20%、PCL分子量为40000时,复合材料的断裂强度从15.94 MPa增至33.60 MPa,断裂伸长率从1.0%升至18.4%;PCL的分子量越高,PCL与CS的界面相容性越低。该研究为壳聚糖基复合材料的热塑加工制备及其应用奠定了一定的理论基础。

一种甲氧基封端苯基甲基硅树脂预聚体合成工艺的探究

以苯基三氯硅烷、二甲基二氯硅烷、甲醇、水为原料,水解缩合制备甲氧基封端的苯基甲基硅树脂预聚体.探究了水解和加料方式、溶剂、反应时间、温度等对反应过程及产物性能的影响,通过对预聚物组成、结构及性能的表征,确定了制备液体硅树脂预聚体的最优反应条件.