淀粉接收聚合物吸水树脂的研究

研究了淀粉接枝丙烯酸、丙烯酰胺聚合物吸水树脂合成工艺条件与吸水性能的关系，结果表明，在适当的原料配比和适宜的工艺条件下，可得到较高吸水倍数的树脂。     

影响PVC树脂聚合物降解的主要因素及预防措施

PVC树脂聚合物出现降解后,会使PVC塑窗异型材制品内在质量降低,外观产生质量问题。本文通过聚合物降解产生的危害、降解机理等的论述,指出了影响PVC树脂聚合物降解物主要因素及预防措施。     

浅析影响PVC树脂聚合物降解的主要因素及预防措施

PVC树脂聚合物出现降解后,会使PVC塑窗异型材制品内在质量降低,外观产生质量问题。本文通过聚合物降解产生的危害、降解机理等的论述,指出了影响PVC树脂聚合物降解物主要因素及预防措施。     

液晶聚合物在涂料中的应用

液晶聚合物是具有分子部分取向状态的聚合物，分子沿流动方向的聚向导致其粘度较低，从而使之适用于高固体分涂料，这类聚合物还显示优良的硬度和柔韧性的平衡，评述了如丙烯酸、醇酸、聚酯和环氧等各类树脂的合成方法及其表征的不同技术，讨论了液晶聚合物超过其对应无定形聚合的优点，给出了配制烘烤型和非烘烤型液晶丙烯酸共聚物的原则。     

丙烯酸树脂及其涂料

用于提高硬度和附着力的透明涂料用丙烯酸聚合物组合物：JP2004-300238，金属表面用丙烯酸树脂涂料组合物：W02004—98796，丙烯酸有机硅涂料组合物：KR156784,可防止底材边缘堆积的丙烯酸聚合物涂料组合物及其涂漆物品：JP2004—331700，含酸官能丙烯酸共聚物和二氧化硅的低VOC可室温固化的涂料组合物……     

淀粉接枝聚合物吸水树脂的研究

研究了淀粉接枝丙烯酸、丙烯酰胺聚合物吸水树脂合成工艺条件与吸水性能的关系。结果表明，在适当的原料配比和适宜的工艺条件下，可得到较高吸水倍数的树脂。     

超支化聚合物改性醇酸树脂的性质研究

在合成醇酸树脂中，采用端基为羟基的超支化聚合物代替多元醇，对醇酸树脂进行改性，考察了改性后醇酸树脂与固化剂和丙烯酸树脂的相容性。研究发现：改性后的醇酸树脂与固化剂相容性很好．与丙烯酸树脂相容性较差。利用改性后的醇酸树脂制备的漆膜具有很好的透明性和柔韧性。     

增韧改性环氧树脂互穿网络聚合物的合成与表征

合成了端异氰酸酯/环氧丙烯酸树脂互穿网络聚合物,在环氧树脂交联网络中引入柔性链段,达到增韧的目的。通过改变端异氰酸酯和环氧丙烯酸树脂的组分比,合成不同组成的互穿网络聚合物(IPNs)。借助红外光谱和扫描电镜等分析方法,研究了IPNs的分子混合形态结构。同时采用差热分析法(DSC)测试了聚合物的玻璃化转变温度,结果表明:端异氰酸酯预聚体含量越高,聚合物的玻璃化转变温度越低。对成膜物的力学性能研究表明,INPs的拉伸强度在端异氰酸酯/环氧丙烯酸树脂比例为30:70时,拉伸强度为55.24 MPa,是纯环氧树脂的2.5倍。     

丙烯酸树脂及其涂料

可以填充不平整表面和形成厚膜的防腐蚀丙烯酸环氧三聚氰胺树脂热固性涂料及其涂装方法;高性能UV固化丙烯酸涂料;对底材附着性、硬度和柔性优异的丙烯酸聚合物涂料组合物;丙烯酸聚合物耐划伤光固化硬涂料及其涂覆的树脂模塑件;一种高封闭性聚丙烯酸酯分散体的制备方法     

互穿聚合物网络讲座（连载六）

第六章IPN功能高分子材料1离子交换树脂（IER）在第一章里曾介绍过，Millar第一个使用了IPN的术语，认真地研究了聚苯乙烯／聚苯乙烯的Homo－IPNs，用来合成离子交换树脂的基质。从此以后，IPN离子交换树脂的理论和应用研究一直没有间断。1.1IPN离子交换树脂的分类根据IPN的结构，IPN离子交换树脂分成半-IPN和全-IPN两大类。1．1．1半-IPN离子交换树脂a两性IER-蛇笼IERHatch等首次报道了半-ⅠIPN蛇笼ⅠER[1]，其中聚合物Ⅰ是交联的聚苯乙烯，聚合物Ⅱ是线性的聚丙烯酸。合成方法是用丙烯酸单体浸泡商业IER（如DowexA－…     

HPLC测定高吸水性树脂中残余丙烯酸的含量

介绍了高吸水性树脂中残余丙烯酸的HPLC分析方法。该分析方法能够准确地分析高吸水性树脂中残余丙烯酸含量,回收率为96.7%-101.3%,相对标准偏差为2.96%,是一种快速、准确的分析方法,可以用于控制高吸水性树脂的质量。     

聚松香乙二醇酯丙烯酯及其氧化物的合成

以松香、乙二醇为原料,合成松香乙二醇单酯,再与丙烯酸反应,得到松香乙二醇酯丙烯酯;然后在催化剂的作用下催化聚合得到聚松香乙二醇酯丙烯酯,再在催化剂作用下用过氧化氢氧化聚松香乙二醇酯丙烯酯。测定了聚松香乙二醇酯丙烯酯及其氧化物的比表面积、孔径、溶解性和差热等各种性能。BET法测定聚松香乙二醇酯丙烯酯的比表面、孔径分别为 0.3185 m²/g, 60~90 nm;聚松香乙二醇酯丙烯酯氧化物的比表面积、孔径分别为 9.3669 m²/g, 50~90 nm,说明所合成的聚合物为大孔树脂;聚松香乙二醇酯丙烯酯及其氧化物在乙醇中的溶解度分别为每 100 mL 0.0272 和 0.00482 g;聚松香乙二醇酯丙烯酯的交联度为 12.3%;两种聚合物失重 5% 时分别对应的温度为259.8和 307.8℃;在30~550℃的温度范围内样品没有明显的软化点;相对分子质量测定结果表明聚松香乙二醇酯丙烯酯氧化物的相对分子质量在 25000以上。     

粉状丙烯酸低聚物的快速合成和应用

简要介绍粉状丙烯酸低聚物的快速节能合成工艺技术以及丙烯酸低聚物的应用市场概况。     

A simple chemical approach to the production of nano‐sized crystals of poly(acrylic acid)

A new approach is proposed which is shown to be a feasible method for the production of nano‐sized polymer crystals of poly(acrylic acid). The new approach involves in situ polymerization of acrylic acid in the interlayers of layered double hydroxides, followed by exchange of the polymer anions for carbonate. The key is the use of a layered double hydroxide as a template. Copyright © 2006 Society of Chemical Industry     

弹性聚合网络对聚合物分散液晶膜电-光性能的影响

研究了由丙烯酸丁二醇酯（BDDA）/甲基丙烯酸丁酯（BMA）/液晶和丙烯酸羟丙酯（HPA）/丙烯酸丁二醇酯（BDDA）/甲基丙烯酸丁酯（BMA）/液晶两种复合物经紫外光照射后所形成的聚合物分散液晶（PDLC）薄膜的电-光性能。丙烯酸羟丙酯的存在提高了聚合网络的弹性,并且提高了PDLC薄膜的稳定性、PDLC薄膜的电-光性能的稳定性及热稳定性。     

外墙外保温系统专用粘结剂的研制

介绍了外墙外保温系统专用粘结剂中乳液的合成、性能及其应用，讨论了聚合物乳液中丙烯酸含量、乳化剂种类及添加量等对其性能的影响，确定了该外墙外保温系统专用粘结剂中聚合物乳液与水泥的最佳配比。     

Polycarbonate-modified acrylic polymers for coating materials

Reactivities of six-membered cyclic carbonates (1) were studied and a carbonate-modified acrylic polymer was synthesized, which was expected to show good water resistance. The carbonates (1) reacted with several alcohols under acidic conditions giving the corresponding alkyl 3-hydroxypropyl carbonates, quantitatively. The reactivities of 1 with alcohol depended on their steric hindrance, on the acidity of the catalyst and on the basicity of the solvents. ¹³C NMR analysis indicated that the reaction proceeded by interaction between the CO group of 1 and the acid catalyst, followed by ring-opening of 1 via the nucleophilic attack by the alcohol on the CO group. This reaction of 5,5-dimethyl-1,3-dioxane-2-one (1a) with n-butanol produced polymers (2) at 50°C in toluene, using methane sulfonic acid as a catalyst. The molecular weights ranged from 2530 to 9310 and ¹H NMR showed that the polymerization was initiated from n-butanol. Also the ring-opening reaction enabled the production of both a carbonate-modified acrylic polymer (4a) containing carbonate units in their side chains by the reaction of 1a with poly(styrene-co-2-hydroxyethyl methacrylate) (3a) and methacrylic monomers (HEMAC) containing 3-hydroxyneopentyl carbonate units by reaction of 1a with 2-hydroxyethyl methacrylate (HEMA). Free radical copolymerization of HEMAC also produced carbonate-modified acrylic polymer (4c). A carbonate-modified acrylic polymer showed excellent hydrolysis resistance when compared with -caprolacton-modified acrylic polymer (5a). Waterborne coatings, consisting of a carbonate-modified acrylic polymer (4c) and a melamine resin, showed excellent storage stability at 40°C when compared with a similar coatings based on an -caprolactone-modified acrylic polymer (5b), and the 4c melamine coating showed nearly the same curability to that of the 5b melamine coating when baked at 140°C for 30 min.     

Ultrasonic degradation of poly(acrylic acid)

The ultrasonic degradation of poly(acrylic acid), a water‐soluble polymer, was studied in the presence of persulfates at different temperatures in binary solvent mixtures of methanol and water. The degraded samples were analyzed by gel permeation chromatography for the time evolution of the molecular weight distributions. A continuous distribution kinetics model based on midpoint chain scission was developed, and the degradation rate coefficients were determined. The decline in the rate of degradation of poly(acrylic acid) with increasing temperature and with an increment in the methanol content in the binary solvent mixture of methanol and water was attributed to the increased vapor pressure of the solutions. The experimental data showed an augmentation of the degradation rate of the polymer with increasing oxidizing agent (persulfate) concentrations. Different concentrations of three persulfates—potassium persulfate, ammonium persulfate, and sodium persulfate—were used. It was found that the ratio of the polymer degradation rate coefficient to the dissociation rate constant of the persulfate was constant. This implies that the ultrasonic degradation rate of poly(acrylic acid) can be determined a priori in the presence of any initiator. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Hydroxyethyl chitosan‐g‐poly(acrylic acid‐co‐sodium acrylate) superabsorbent polymers

A novel hydroxyethyl chitosan‐g‐poly(acrylic acid‐co‐Sodium Acrylate) (HECTS‐g‐(PAA‐co‐PSA)) superabsorbent polymer was prepared through graft copolymerization of acrylic acid and sodium acrylate onto the chain of hydroxyethyl chitosan. The structure of the polymer was characterized by FTIR. By studying the water absorption of the polymer synthesized under different conditions, the optimal conditions for synthesizing the polymer with the highest swelling ratio was defined. This superabsorbent polymer was further treated by the solvent precipitation method and by the freeze‐drying method. We found that the water absorption rate of the treated polymer was greatly increased and the microstructure of the treated polymer was changed from small pores to loose macro pores. The swelling processes of the polymers before and after modification fit first‐order dynamic processes. The amount of the residual acrylic acid was greatly decreased after treatments. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Mixed solvent and polyacrylamide-blended ethylcellulose liquid crystals

The mesophase behaviours of mixed solvent cellulosic liquid crystal systems, ethylcellulose/acrylic acid+water (EC/AA+W), ethylcellulose/acrylic acid+glacial acetic acid (EC/AA+GAA) and of ethylcellulose/acrylic acid systems blended with a flexible polymer, polyacrylamide (PAM+EC/AA), have been studied. The critical concentrations decreased in all the systems compared with the pure EC/AA system and the morphologies were affected, but still cholesteric. The cholesteric properties varied with composition of solvent and polymers. ©1997 SCI