含氟丙烯酸酯聚合物结构对性能的影响分析

将含氟基团引入丙烯酸酯合成的丙烯酸聚合物,不仅具有丙烯酸酯原有的各种性能优势,还可以赋予其更多含氟化合物的特性。介绍了含氟丙烯酸酯类聚合物的主要种类（均聚物、共聚物）及其典型的合成方法,总结分析了影响含氟丙烯酸酯类聚合物性能的关键因素,指出合成更加环保、成本低廉、性能媲美长链氟丙烯酸酯等优异表面性能的含氟丙烯酸酯类聚合物是未来研发方向。     

丙烯酸的生产工艺

丙烯酸是一种重要的有机合成原料,丙烯酸及丙烯酸酯类可以共聚,其共聚产物多数可用于树脂、合成纤维等工业材料的制作。近年来,随着我国科学技术的发展,丙烯酸的生产工艺也趋于成熟。详细分析了丙烯酸的生产工艺流程。     

含氟(甲基)丙烯酸酯的RAFT聚合及其应用

众所周知,普通自由基聚合制备的含氟聚合物具有分子量、分子量分布和聚合物结构不易控制等缺点;可逆加成-断裂链转移聚合(RAFT)可以有效克服以上缺点,成为含氟(甲基)丙烯酸酯类聚合物设计与合成的重要工具。综述了近年来含氟(甲基)丙烯酸酯类单体RAFT聚合研究及其应用研究进展,指出可见光诱导的含氟(甲基)丙烯酸酯类单体的RAFT聚合以及聚合诱导的自组装是今后的发展方向。     

加工助剂ACR-PVC生产工艺的改进

对丙烯酸酯类聚合物ACR -PVC加工助剂的生产工艺进行优化 ,考察了加料方式、温度等对乳液聚合工艺的影响 ,提高ACR加工助剂的性能。     

含氟丙烯酸酯聚合物的制备及应用研究

以含氟丙烯酸酯为主要单体制备了含氟丙烯酸酯聚合物,利用红外光谱和扫描电镜对制备的含氟丙烯酸酯聚合物进行了表征,研究了氟单体、链转移剂和功能单体的含量对含氟丙烯酸酯聚合物性能的影响,并用于石材表面防护,对防护后石材表面性能进行了测试,研究结果表明,经过含氟丙烯酸酯聚合物处理后石材表面具有优异的防水、防油和耐沾污、耐酸碱性能。     

新型超支化环氧丙烯酸酯的合成及表征

采用质子转移聚合法成功制备了超支化环氧树脂,并通过丙烯酸对其端基进行化学改性合成了一种新型的超支化环氧丙烯酸酯,采用FTIR、1H NMR对产物结构进行了表征。通过控制投料比及测定产物酸值来监测反应进行的程度,使生成的超支化环氧丙烯酸酯中既含有环氧基又含有碳碳双键,使之兼具阳离子型光聚合与自由基型光聚合的协同作用。测试了超支化聚合物在氯仿中的紫外-可见光谱和荧光发射光谱,超支化环氧树脂和超支化环氧丙烯酸酯的荧光发射波谱出峰位置分别为314 nm和311 nm。研究表明,超支化聚合物具有较强的荧光性能,作为光固化材料在光学、医疗器件、防伪等领域具有潜在的应用价值。     

水溶性含氟丙烯酸酯乳液的合成研究进展

含氟丙烯酸酯类聚合物因具有突出的成膜性能及耐老化性能而成为优良的成膜材料。其中,水溶性含氟丙烯酸酯乳液的合成研究,具有广泛的单体种类,聚合方式简单多样,在涂料领域受到了广泛的应用和关注。选择合适的乳液共聚单体及聚合工艺,不仅能够根据实际需要调节含氟聚合物的分子结构,而且可以获得最佳含氟量,以满足特殊性能需要的含氟丙烯酸酯乳液。综述了水溶性含氟丙烯酸酯乳液的聚合方法、常用含氟单体和非氟单体以及改性研究进展。     

丙烯酸酯类加工助剂(ACR)生产工艺的改进

针对吉化集团公司苏州安利化工股份有限公司丙烯酸酯类聚合物ACR-401加工助剂的生产工艺进行了优化.考察了加料方式、温度等对乳液聚合工艺的影响,提高了ACR-401加工助剂的性能.     

丙烯酸酯类加工助剂（ACR）生产工艺的改进

针对吉化集团公司苏州安利化工股份有限公司丙烯酸酯类聚合物ACR－401加工助剂的生产工艺进行了优化,考察了加料方式,温度等对乳液聚合工艺的影响。提高了ACR－401加工助剂的性能。     

含氟“三防”纺织助剂的合成方法及发展前景

目前所合成的含氟聚合物主要是含氟丙烯酸酯类共聚物,特别是含氟共聚物乳液,是将含氟单体与丙烯酸酯类单体或其它乙烯类单体通过乳液共聚而制得。该合成方法的条件简单、操作易控,可制得稳定的共聚物乳液,产物防水性、防油性、耐候性及耐腐蚀性都较好。     

Radical polymerization approach for ring opened oxanorbornene anhydride based macromonomers

In this work, we synthesized end group functionalization of the cis-Norbornene-5-6-endo-dicarboxylic anhydride species via the ring-opening metathesis polymerization (ROMP) of oxanorbornene derivatives generated a chiseled poly(cis-Norbornene-5-6-endo-Dicarboxylic anhydride) acrylate macromonomer. Further, acrylate oxanorbornene based macromonomer further polymerized via reversible addition fragmentation chain transfer (RAFT) polymerization technique. Chain transfer is exhibited in the structure during the radical polymerizations so that free radical polymerization could also be used to comb structure copolymers with a PDI value below 1.2 with the help of acrylate oxanorbornene. Atomic force microscopy reveals the comb shape of branched polymer brushes structure. This method involves polymerizable end-group attachment to a macromonomer, and the backbone of the comb polymer is created in a second step of the polymerization. We believe that this kind of comb structured polymers can be considered for different biological applications.     

丙烯酸丁酯原位悬浮聚合法制备表面改性纳米TiO_2

将悬浮聚合与溶液聚合方法改性纳米TiO2作了对比研究,探讨了介质和单体浓度对结果的影响,并对改性后纳米二氧化钛粒子的分散性能进行了分析。结果表明,在悬浮与溶液聚合条件下,在纳米TiO2粒子表面均能形成聚合物包覆层,当单体浓度为0.25 g/mL时包覆率达最大值。TG表明与以水为介质相比,在乙醇中聚合物包覆率较大,但TEM表明包覆前的纳米粒子在乙醇中更易团聚,因此悬浮聚合条件下更利于聚合物在单个纳米粒子表面的吸附从而促进纳米粒子的分散。     

The effect of interpenetrating polymer network formation on polymerization kinetics in an epoxy‐acrylate system

The kinetics of thermally initiated cationic epoxy polymerization and free radical acrylate photopolymerization were studied using photo-differential scanning calorimetry. The reactions of the neat monomers and diluted monomers as well as interpenetrating polymer networks (IPNs) were studied as a function of dilution by the other monomer and temperature. The reaction sequence was also varied to study its effect on the kinetics of formation of the simultaneous IPN's. Both reactions quickly become diffusion controlled. The effects of increasing temperature and dilution on the acrylate polymerization rate profiles are similar, leading to reduced polymerization rate and longer polymerization times. The dilution effect on the epoxy polymerization is similar to that of the acrylate. However, unlike the acrylate reaction the epoxy polymerization rate increases strongly with temperature. The preexistence of one polymer has a significant effect on the polymerization of the second monomer. This effect is larger for the acrylate than for the epoxy polymerization. New kinetic models are needed to capture these complex behaviors.     

聚合工艺和组成对苯丙乳液最低成膜温度的影响

通过对不同聚合工艺和组成制得的苯丙聚合物乳液 ,测其最低成膜温度 (MFT) ,结果发现 :利用种子乳液聚合 ,核主要组成为聚苯乙烯 ,壳主要组成为聚丙烯酸丁酯 ,所制得的核壳聚合物乳液与同组成无规共聚所得乳液相比 ,MFT能下降 2 5℃左右。其意义有二 :( 1 )该乳液可在较低温度下使用 ,从而拓宽了施工温度范围。 ( 2 )若制得与常规共聚乳液相同MFT时 ,该方法所制得的乳液由于可少用价格高昂的丙烯酸丁酯 ,多用价廉的苯乙烯 ,从而降低乳液成本 ,使该类产品具有较强的市场竞争力。     

Poly(lauryl acrylate) and poly(stearyl acrylate) grafted multiwalled carbon nanotubes for polypropylene composites

Two new polymer grafts on an industrial grade multiwalled carbon nanotube (MWCNT) were prepared through a non-oxidative pathway employing controlled free radical polymerization for surface initiated polymer grafting. After photochemical introduction of an ATRP initiator onto the MWCNT, polymerizations of lauryl or stearyl acrylate were performed, resulting in two novel polymer modifications on the MWCNT (poly(lauryl acrylate) or poly(stearyl acrylate)). The method was found to give time dependent loading of polymers as a function of time (up to 38 wt% for both acrylates), and showed a plateau in loading after 12 h of polymerization. The modified nanomaterials were melt mixed into polypropylene composites with very low filler loading (0.3 wt%), whereafter both the thermal and electrical properties were investigated by DSC and dielectric resonance spectroscopy. The electrical properties were found to be substantially improved, where poly(lauryl acrylate) was found to be the superior surface modification, resulting in a conductive composite.     

Microporous polyurethane/acrylate gel polymer electrolyte obtained by emulsion polymerization

A novel polyurethane/acrylate (PUA) porous gel electrolyte was prepared by a new method, emulsion polymerization. Compared with the traditional phase inversion method, the new method can eliminate the pollution from solvent and decrease the cost of production. The swelling properties and morphology of the porous polymer membranes were characterized. The porous membranes, made by emulsion polymerization, could absorb large quantities of electrolyte solution to form porous gel electrolytes. The gel electrolytes have good solvent retention ability and high ionic conductivity. Copyright © 2004 Society of Chemical Industry     

聚丙烯酸钠高吸水性树脂的性能改善

采用水溶液聚合法合成了聚丙烯酸钠高吸水性树脂，并通过改变聚合过程中的添加剂和进行吸水性树脂的表面交联反应处理，对产品性能进行了研究。结果表明在聚合过程中添加适当的添加剂和对产品进行表面交联反应处理，能显著地改善产品性能。     

Polymer–leather composites. II. Kinetics of the deposition of selected acrylate monomers by polymerization into chrome-tanned cattlehide

Limited kinetic information on a convenient process for depositing polymer in 5-oz cattlehide is presented in this article. The work includes a systematic study of the total polymerization rate and of the derived rates of deposition into the fibrous matrix, of bound polymer formation, and of polymer production in the external aqueous phase (the float) for three acrylic monomers. The monomers used, with a persulfate–bisulfite redox initiating system at 27°C, were methyl methacrylate (MMA), n-butyl acrylate (BA) and a fixed mixture of n-butyl acrylate and methyl methacrylate (BA + MMA). The effects of the reaction variables on rate, as measured by their intensity exponents, were not in agreement with a rate expression proposed to describe grafting in homogeneous polymerization, nor were they wholly compatible with classical and modified Smith–Ewart theories for heterogeneous emulsion polymerization. The experimental behavior, however, was in harmony with self-nucleation in the aqueous phase. Exponential orders of dependence were initiator > 0.5 (MMA, 0.72; BA + MMA, 0.66); monomer, zero; surfactant, ～0.5. The approximately 0.6 order dependence (MMA, 0.9) on leather amount was shown to be largely apparent and to decline as total polymerization proceeded. Thus a dominant grafting reaction was not supported. In support of this conclusion, simple impregnation of the matrix with preformed emulsion polymer yielded the same amount of bound polymer as that formed in situ. It was concluded that monomer is initiated largely from active centers formed initially near fibers or fibrils to form embryo polymer particles, which join penetrating swollen polymer particles and become unstable. These nucleate a polymer front, containing occluded radicals, which grows by diffusion regulated transport of monomer to complete deposition.