疏水化水溶性两性纤维素接枝共聚物CGAO的合成及其水溶液的粘度 …

通过丙烯酸胺及甲基丙烯酰氧乙基二甲基辛基溴化铵与羧甲基纤维素钠进行接枝共聚制备疏水化水溶性两性纤维素接枝共聚物。用红外光谱与元素分析对ＣＧＡＯ的组成进行分析。考察了ＣＡＧＯ的组成，浓度及无机盐对其水溶液粘度行为的影响。     

硫氰酸钠法高吸湿腈纶的研制

研究了丙烯酸对腈纶的吸湿改性。探讨丙烯酸共聚物的水溶性随丙烯酸-丙烯腈的共聚比而变化的规律,丙烯酸含量对改性腈纶的力学性能,回潮率和保水率的影响。结果表明,采用丙烯酸-丙烯腈投料比为1:5.7的共聚物溶液和常规腈纶纺丝原液共混纺丝,在纤维中引入质量分数2.5％的丙烯酸时,制得的高吸湿腈纶强度为1.9cN/dtex,伸长40％,回潮率和保水率分别为7.0％和20.8％。     

丙烯酸乙酯丙丙烯酰胺共聚物的合成

以ＢＰＯ为引发剂合成丙烯酸乙酯丙丙烯酰胺二元共聚物，对其进行了溶解性能和提纯方法的研究，结果发现，当丙烯酸乙烯烯酰胺以３：７投料时，所得共聚物即可水溶。     

电沉积阳离子丙烯酸树脂的水溶性规律及其成漆性能研究

试验合成用于电沉积的阳离子丙烯酸树脂,研究了影响树脂水溶性和漆膜性能的因素。结果表明：共聚物中氨基是其水溶性能的基础,水溶性由氨基的含理决定,同时含差基的尖性单体,共聚物相对分子质量大小及分布,中和剂及助溶剂等也影响树脂的水溶性,共聚物的配比组成,变联剂以及固化条件对漆膜性能有很大影响。     

水溶性聚合物存在下的苯乙烯/丙烯酸丁酯乳液共聚合

以苯乙烯、丙烯酸丁酯为单体,以十二烷基硫酸钠为乳化剂,并向反应体系加入适量的水溶性苯乙烯-丙烯酸共聚物进行一次投料的间歇乳液聚合反应,详细分析了该体系的动力学规律和乳胶粒直径及分布的规律,通过乳液聚合的动力学模型探讨了水溶性聚合物及其它因素对聚合反应速率、乳液稳定性的影响.结果表明,该水溶性聚合物参与的乳液聚合反应规律与小分子乳化剂的乳液聚合基本相似,但聚合反应速率大大下降.     

水溶性纳米富勒烯改性丙烯酸树脂的合成及应用研究

将纳米C60/C70直接引入到丙烯酸(酯)共聚物中,合成得到具有耐热性和抗紫外线功能的水溶性C60/C70-丙烯酸(酯)共聚物.     

AM-AA-ADMOAB共聚物的合成及其水溶液的黏度性能

通过丙烯酰胺 (AM)、丙烯酸 (AA)与甲基丙烯酰氧乙基二甲基辛基溴化铵 (ADMOAB)共聚 ,合成了疏水化水溶性共聚物 (HAPAM)。考察了HAPAM的组成、质量浓度及无机盐对其水溶液黏度行为的影响。发现组成对黏度有直接影响 ,水溶液黏度随共聚物的质量浓度增加而增大并存在临界缔合质量浓度 ρ ,ρ 与其组成紧密相关。结果表明 :由于在聚合物中引入了疏水结构及两性离子结构 ,这类聚合物表现出较好的抗盐性能     

疏水缔合物在粘表面吸附特性的研究

目前国内外围绕疏水缔合水溶性共聚物的研究主要集中在其分子结构,合成以及溶液性能等方面,而有关疏水缔合水溶性共聚物与粘土相互作用的研究非常少。本实验主要研究疏水缔合水溶性共聚物在蒙脱土上的吸附规律。研究影响吸附的因素有疏水缔合水溶性共聚物的浓度、无机盐的浓度、pH值、温度等。     

ZG－93丙烯酸共聚物阻垢分散剂的研制及阻垢机理探讨

本文采用带官能团的丙烯酸、丙烯酸酯、ＡＧｐ－１、顺丁烯二酸酐为反应单体，水为溶剂，合成、制备出一种四元水溶性共聚物──ＺＧ－９３阻垢分散剂。并用静态沉淀法，研究了ＺＧ－９３在不同时间、温度、钙离子浓度、ｐＨ值、阻垢剂用量条件下，对ＣａＣＯ３、Ｃａ３（ＰＯ４）２、ＣａＳＯ４垢粒的阻垢效果以及对铁红的分散作用。文中还从ＺＧ－９３分子结构、低剂量效应、晶格畸变作用以及分散作用方面对其阻垢机理进行了探讨。     

利用原子转移自由基聚合制备水溶性含氟嵌段共聚物

利用原子转移自由基聚合技术合成了相对分子质量可控,相对分子质量分布较窄的丙烯酸叔丁酯与氟烷基（甲基）丙烯酸酯的嵌段共聚物。进一步将嵌段共聚物的丙烯酸叔丁酯链段在酸性条件下水解,制备了水溶性含氟嵌段共聚物,借助核磁共振氢谱和红外光谱对嵌段共聚物进行了表征。     

Synthesis and properties of hydrophobically modified water-borne polymers for pigment stabilization

Some aspects of the molecular design of pigment stabilizers are discussed. The approach of employing copolymers with pigment-affine segments and matrix-affine segments will be particularly addressed. First experimental results obtained with amphiphilic block copolymers and amphiphilic graft copolymers with similar overall composition with regard to polar and relatively non-polar blocks of, e.g. polar backbone and relatively non-polar grafts will be presented. The comparison between the poly(acrylic acid)-polystyrene block copolymer and the graft copolymer with poly(acrylic acid) backbone and polystyrene grafts showed a similar stabilization of TiO₂ in water.     

高密度聚乙烯／尼龙1010共混体系的研究

采用接枝共聚方法,合成了高密度聚乙烯与马来酸酐,甲基丙烯酸和丙烯酸丁酯的接枝共聚物增容剂,研究了增容剂中接枝单体的种类及含量和增容剂用量等因素对高密度聚乙烯／尼龙1010共混体系力学性能的影响,结果表明在不同类型的接枝共聚物中以聚乙烯马来酸酐接枝共聚物对HDPE／PA1010共混体系的增容效果最好,在接枝单体含量和增容剂用量分别为4％－6％和5％左右时,共混体系的力学性能最好。     

Phase behavior and mechanism of formation of protofiber morphology of solution spun poly(acrylonitrile) copolymers in DMF‐water system

Phase diagrams of a series of copolymers of acrylonitrile (AN) and acrylic acid (AAc) were constructed using linearized cloud point correlation. The miscibility region in the phase diagram was found to increase with the increase in AAc content of the copolymers. For various compositions, χ₁₃ (polymer–water interaction parameter) values were estimated by sorption experiment. As the hydrophilic nature of the polymer increased with the increase in the content of acrylic acid, the χ₁₃ interaction parameter was found to decrease from poly(acrylonitrile) homopolymer to its copolymer with 50 mol % acrylic acid (AA50B). The polymer–solvent interaction parameters (χ₂₃) and composition at the critical points for all the polymers were determined by fitting the theoretical bimodal curves to the experimental cloud point curves using Kenji Kamide equations. The polymer composition at the critical point was found to increase by 400% with increasing AAc content. The polymers were solution spun in DMF‐water coagulation bath at 30°C and their protofiber structures were investigated under scanning electron microscopy. The observed morphological differences in protofibers were explained on the changes brought about in the phase separation behavior of the polymer–solvent–nonsolvent systems. The copolymers with higher acrylic acid content could be solution spun into void free homogeneous fibers even at conditions that produced void‐filled inhomogeneous fibers in poly(acrylonitrile) and its copolymers with lower AAc content. The experiments demonstrate the important role of thermodynamics in deciding the protofiber morphology during coagulation process. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Improving water solubility of poly(acrylic acid‐co‐styrene) copolymers by adding styrene sulfonic acid as a termonomer

Acrylic acid is often used to make water‐soluble polymers while styrene is often modified to add special functions to polymers. However, when styrene and acrylic acid are copolymerized, the resulting polymer is much less water soluble. To regain water solubility, the effect of styrene sulfonic acid on solubility of poly(acrylic acid‐co‐styrene) copolymers was investigated. Even though acrylic acid polymers are known for their water solubility, the presence of styrene units within acrylic acid copolymers reduces the solubility of the copolymer substantially at the natural pH of the solutions. By adding styrene sulfonic acid as a termonomer, polymers that are water soluble at the natural pH of the polymerization could be obtained. The solubility of the polymer after removal of the solvent and by redissolving at different concentrations and pH levels is also reported. Solubility increases at higher pH especially with low styrene concentration in the copolymer. It was found that incorporation of as little as 5 mol % of styrene into poly(acrylic acid) reduced the aqueous solubility to less than 0.5 g dL^?1 at pH 7. Upon adding 7 mol % styrene sulfonic acid as a termonomer, the water solubility increased to 5 g dL^?1 at pH 7. At higher levels of styrene, more styrene sulfonic acid was needed, especially at low pH. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

共聚物阻垢分散剂中官能团对硫酸钙阻垢协同作用研究

以水为溶剂,过硫酸胺为引发剂,丙烯酸、异丙烯膦酸、丙烯酰胺为单体,分别合成了低分子量的丙烯酸／丙烯酰胺、异丙烯膦酸／丙烯酰胺二元共聚物,以及不同配比的丙烯酸／异丙烯膦酸／丙烯酰胺三元共聚物．用红外光谱对产物进行了表征。研究了在相同条件下,所舍相同基团的共聚物阻垢剂与复配型阻垢剂对硫酸钙的阻垢性能,以及不同组成的共聚物阻垢剂对硫酸钙的阻垢性能。用扫描电镜观察了共聚物阻垢剂与复配型阻垢剂对硫酸钙结晶形态的影响。结果表明,同一分子链上的基团间具有较好的阻垢协同效应,且基团组成不同,其阻垢协同效应也不同。     

Free‐radical polymerization of urea,acrylic acid,and glycerol in aqueous solutions

The main objective of the present study is to produce copolymers of urea, acrylic acid, and glycerol through aqueous solution free‐radical polymerizations and analyze the structural, thermal, rheological, and release properties of the obtained materials. To do this, aqueous solution copolymerizations were performed in different reaction conditions and the obtained copolymers were characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, rheological analyses, thermogravimetry, gel permeation chromatography, and rates of urea release in distilled water. The obtained results indicate that all constituents of the reacting mixture (potassium persulfate, glycerol, urea, and acrylic acid) affect the characteristics of the produced copolymers. In particular, it is shown that urea can be incorporated into the final copolymer through the proposed reaction scheme, that glycerol promotes crosslinking of polymer chains and that the obtained copolymer materials can be used in agricultural applications. POLYM. ENG. SCI., 55:1219–1229, 2015. © 2015 Society of Plastics Engineers     

Swelling properties of copolymers of styrene and divinylbenzene containing sulfonic and carboxylic acid groups

Copolymers of styrene, divinylbenzene, and acrylic acid that have undergone sulfonation exhibited good water absorbency properties. Removal of the lower molecular weight fraction in the surface region of the copolymer particles by toluene extraction before sulfonation has further increased the water swelling capacity of the sulfonated copolymers. The extent of swelling of the UV‐irradiated copolymer could be related to the ratio of divinylbenzene to styrene. The less crosslinked copolymers were shown to absorb more water. The incorporation of more carboxylate groups in the copolymer could further increase its swelling capacity. Without UV irradiation, the carboxylate containing copolymer was found to absorb more water than the sulfonated copolymer. UV irradiation has induced more effective crosslinking in the carboxylate containing copolymer, hence impairing its water absorbency. By replacing styrene and divinylbenzene partially with butyl acrylate, whereby the amount of crosslinking was reduced, the copolymer was able to absorb water 110 times of its dry weight. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Synthesis of pH-sensitive micelles from linseed oil using atom transfer radical polymerisation (ATRP)

This paper reports the synthesis of an amphiphilic copolymer from linseed oils and its successive auto-association in water into pH-sensitive micelles. An original ATRP lipoinitiator is first designed from linseed oil in two steps. tert-butyl acrylate (tBA) polymerization is consequently initiated from this original initiator and amphiphilic copolymers are obtained after subsequent acidolysis of the PtBA block into poly(acrylic acid) (PAA). The ability of a lipid-b-PAA copolymer to auto-associate in water is finally investigated through different techniques (Fluorescence, Surface Tension, QELS). This copolymer forms well-defined micelles in acidic media with a low critical micellar concentration (cmc) of 7.6 mg L^?1 and dissociates when the pH is raised above 7.     

Function and performance of silicone copolymers(II): Syntheses and interfacial behavior of siliconized acrylic copolymers

Polysiloxane‐containing copolymers were synthesized and characterized by nuclear magnetic resonance and elemental analysis. These copolymers were neutralized by triethylamine. The copolymers could be self‐emulsified to form emulsions in water with and without cosolvent PCS and exhibited excellent defoaming abilities. These copolymers were also used as emulsifiers to emulsify silicone oil in water to form stable oil‐in‐water emulsions. This emulsion again exhibited defoaming properties, more efficiently than that of the self‐emulsified emulsion of siliconized acrylic copolymer (SAA). © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 805–811, 1999     

马来酸乙二醇酯、丙烯酸共聚物合成与在水质稳定上的应用研究

合成了马来酸与乙二醇的酯化物。用该酯化物与丙烯酸二元共聚，及用该酯化物、丙烯酸、马来酸酐三元共聚，得到了两种共聚物。讨论了二元共聚物的特性粘数与单体用量的关系，并测定了二元共聚物及三元共聚物对Ｃａ２＋的螯合能力。