偏氯乙烯—丁二烯—苯乙烯胶乳的合成

采用高温低皂乳液聚合技术，以过硫酸铵为引发剂，偏氯乙烯，丁二烯，苯乙烯为单体，合成了ＶＤＣ含量为２３％－４３％，总固物含量为５０％－４％，胶乳粒径为１００－１３０ｎｍ的羧基偏氯乙烯丁苯胶乳。     

交联型聚丙烯酸丁酯胶乳的合成

以十二烷基硫酸钠为乳化剂，过硫酸铵为引发剂，丙烯酸丁酯经两步乳液聚合，合成了胶粒粒径大于２５０ｎｍ，凝胶含量大９０％，适用于合成丙烯酯酯－丙烯腈－苯乙烯共聚物的交联型聚丙烯酸丁酯胶乳。第一步乳液聚合配方及条件：乳化剂用量２％－４％，引发剂用量０．１％－０．４％，交联剂用量２．４％－２．８％；单体采用滴加乳液法或滴加单体法，聚合温度６０－７０℃，聚合时间３－４ｈ，第二步种子聚合条件：乳化剂用量／种子     

歧化松香酸中去氢松香酸含量对BRL的影响

歧化松香酸中去氢松香酸含量对ＢＲＬ的影响张弛（兰州化学工业公司合成橡胶厂，７３００６０）１去氢松香酸含量对反应速度的影响在ＡＢＳ树脂工业生产中，采用乳液聚合一步放大法生产丁二烯胶乳（ＢＲＬ），乳化剂为歧化松香酸钾皂，反应时间为（７２±４）ｈ，转化率大...     

丁苯道路胶乳工业试生产

用减粘剂法釜式（卧式蒸发器）外循环加热真察觉有缩工艺生产了固体物质量分数为４５％的道路胶乳，工业试生产表明，适宜的操作条件为：温度７０～７５℃，真空度－０．０８５ＭＰａ，脱水量３８０～５００Ｌ／ｈ，胡阒浓缩过程中碱性助剂的加入，产品胶乳的ｐＨ值比原料胶乳的高出０．４～２．０，减粘剂的加入速度过快会使胶乳产生絮凝，造成设备堵挂，而且使产品色相呈灰白色，碱性助剂的加料时间以不少于１ｈ为宜，减粘剂的加入量为胶乳总固体物质量的１．３％。     

丁苯胶乳合成中的粒径及其分布

用动态激光光散射法测定了丁二烯－苯乙烯乳液聚合的乳胶料粒子的粒径及其分布,结果表明,在反应初期平均粒径较大,粒径分布最宽,当单体转化率为６０％左右时,乳胶粒子分散度最低,说明粒径较大的液滴逐渐消失,继续聚合,乳胶粒子发生合并聚结,其平均粒径略有增长,粒径分布下降,加入电解质ＫＣｌ是增大乳胶平均粒径的有效方法。     

电解质对丁二烯聚合胶乳粒径的影响

通过改变电解质的用量,研究了丁二烯聚合过程中胶乳粒径的变化规律。结果表明,无电解质条件下胶乳粒子过小,产品流动性差;0．45份电解质体系聚合转化率高,反应时间短,产品流动性好;1．25份电解质体系胶乳粒径变化分2个阶段,反应时间长,生产效率低。     

聚丙烯酸酯—聚有机硅氧烷复合乳液的合成与性能

以在丙烯酸甲酯、丙烯酸丁酯、甲基丙烯酸、八甲基环四硅氧烷（Ｄ４）和乙基七甲基环四硅氧烷（ＶＤ４）为共聚单体,在８５℃下采用一次投料合成了稳定的聚丙烯酸酯－聚有机硅氧迷雾复合乳液。实验结果表明,当ＶＤ４／Ｄ４摩尔比为０．００８,有机硅质量分类小于２０％时,单体转化率均高于８２％,胶乳粒径为５０－６０ｎｍ,且粒径分布均匀;当有机硅质量分数大于２５％时,聚合过程中有凝聚物产生,乳液不稳定,胶膜的拉伸强度     

丁苯胶乳凝胶含量的影响因素

探讨了PVC材料抗冲击改性剂甲基丙烯酸甲酯—丁二烯—苯乙烯共聚物(MBS树脂)专用丁苯胶乳(SBL)合成时各种因素对其凝胶含量的影响及SBL凝胶含量对MBS树脂改性的PVC材料抗冲击性的影响。结果表明，加入少量交联剂，SBL凝胶含量就大大提高；随着相对分子质量调节剂十二硫醇用量增大，SBL出现凝胶的聚合转化率明显增大；丁二烯／苯乙烯配比增大，凝胶含量增大；聚合转化率达到60％后，SBL的凝胶含量快速增大；SBL凝胶质量分数为0．92时，MBS改性的PVC材料抗冲击强度最大。     

无水氯化铁催化合成丁二酸二乙酯

报道了以丁二酸和无水乙醇为原料,在无水氯化铁催化下合成丁二酸二乙酯的反应条件。结果表明：在回流温度下,醇酸物质的量比为２．４：１,催化剂用量为０．０３ｍｏｌ．ｍｏｌ＾－１丁二酸时,反应３ｈ,丁二酸的转化率可达７２．４％。     

PS改性阳离子氯丁胶乳沥青防水涂料的制备和性能研究

研究出了ＰＳ改性阳离子氯丁胶乳沥青防水涂料的制备工艺，当ＰＳ加入量为沥青重量的４％～６％时，产品的延伸性为６２～６１ｍｍ（无处理）和６１～４５ｍｍ（处理后）；柔韧性：－１５±１℃时无裂纹，不断裂；涂层表干和实干时间可缩短为７～６ｈ和２０～１８ｈ。耐热性、粘结性、不透水性、抗冻性均比不加ＰＳ改性的产品有明显提高。     

Chemospecific ring-opening polymerization of α-methylenemacrolides

α-Methylenemacrolides having various groups, such as aromatic, ether, and amine, were enzymatically, anionically, and radically polymerized. The polymerization with the lipase catalyst successfully afforded polymers only through the ring-opening process, whereas the vinyl polymerizations selectively proceeded by using anionic and radical initiators. The polyesters obtained by the enzymatic polymerization have a polymerizable methacrylic methylene group in the main-chain, in addition to the aromatic and polar groups, and were further radically polymerized to quantitatively produce a cross-linked polymer gel.     

Accelerated pressure synthesis and characterization of 2-oxazoline block copolymers

The cationic ring-opening polymerization of 2-oxazolines in acetonitrile was investigated under pressure conditions utilizing methyl tosylate as initiator of which the single crystal X-ray structure is described as well. The polymerization kinetics were studied and compared with previously reported microwave-assisted pressure polymerizations. Moreover, a series of block copolymers was synthesized in an automated parallel synthesis robot utilizing this pressure polymerization method. The resulting block copolymers were characterized with both differential scanning calorimetry and contact angle measurements to determine the effect of copolymer composition on glass transition temperature, melting point and surface energy. Atomic force microscopy was applied to further investigate the possible phase separation.     

苯乙烯的间歇-半连续RAFT细乳液聚合

进行了苯乙烯的间歇-半连续RAFT细乳液聚合,考察了半连续段的起点、单体滴加速率及最终胶乳固含量的影响。结果发现：从最终胶乳的稳定性考虑,半连续聚合的起点选择在间歇聚合的高转化率时期更好;若综合考虑胶乳的稳定性、分子量及其分布、固含量、乳化剂及共稳定剂在胶乳中的残留率等因素,半连续聚合的起点可适当提前,但必须在间歇聚合成核期结束后。过早容易引起乳液的失稳;过迟会延长反应时间,降低聚合物的制备效率,导致死聚物链含量升高。聚合体系的稳定性与胶乳的固含量密切相关,最终固含量不宜超过40％。采用间歇-半连续二段聚合工艺可以制得窄分子量分布(PDI＝～1.3),低乳化剂及共稳定剂残留量（～1.5%,质量）的高分子量聚合物(≈8×10⁴g•mol^-1)。     

Particle formation mechanism in radical polymerization in miniemulsion based on in situ surfactant formation without high energy homogenization

Conventional radical polymerization of styrene at 70 °C in aqueous miniemulsion generated using the in situ surfactant technique, without use of high energy mixing, has been investigated in detail. The surfactant potassium oleate was formed in situ by reaction between oleic acid and potassium hydroxide at the styrene/water interface. The particle formation mechanism was investigated by use of pyrene as a probe, revealing that under suitable conditions with an oil-phase initiator, particle formation occurs primarily via monomer droplet nucleation. The droplet/particle stability is however inferior to that in a typical miniemulsion generated employing ultrasonication, as manifested by a marked increase in droplet/particle size with conversion and a bimodal droplet/particle size distribution by weight. The droplet/particle stability increases with increasing amount of oleic acid, hexadecane, water, and the ratio potassium hydroxide:oleic acid, respectively.     

微乳液聚合研究新进展

对微乳液聚合的特点、聚合机理及动力学影响因素进行了总结和评述，指出了今后微乳液聚合研究的几个关键问题。     

Synthesis of latex particles by ring-opening metathesis polymerization

This paper reviews the recent discoveries that were achieved by our group in the field of particle synthesis via ring-opening metathesis polymerization (ROMP). Both polynorbornene and polybutadiene-based particles were prepared by the respective ROMP of norbornene and cyclooctadiene initiated by (PCy₃)₂Cl₂RuCHPh using several methods of polymerization in dispersed media, such as dispersion, suspension and miniemulsion. Depending upon the process implemented, particles size was found to range from 300 nm to 20 μm.     

等离子体引发丙烯酸(2-乙基)已酯乳液聚合

采用等离子体引发聚合的方法 ,进行了丙烯酸 ( 2 -乙基 )已酯 (简称 EHA)的乳液聚合。考察了后聚合时间、放电功率、乳化剂浓度对聚合转化率及特性粘数的影响。并对丙烯酸酯等离子体引发本体、乳液聚合进行了比较     

Microwave-Assisted RAFT Polymerization

Advances in controlled radical polymerization (CRP) have facilitated access to well-defined polymers with controlled molecular weight, topology, and functionality. However, despite the benefits afforded by many CRP techniques, control over these key polymer attributes often comes at the expense of polymerization rate. One method proposed for accelerating chemical synthesis is microwave heating. This review highlights recent examples of microwave heating being applied during reversible addition-fragmentation chain transfer (RAFT) polymerization. In addition to successfully leading to homopolymers from a variety of monomers, block copolymers have also been prepared by microwave-assisted RAFT, which suggests that the high polymerization rates observed do not necessarily lead to significant end group loss from termination. Despite significant debate regarding the origin of rate enhancement observed during microwave-assisted reactions, the reports included herein provide insight into mechanisms by which well-defined functional polymers can be prepared in an accelerated fashion.     

超声引发聚合反应的研究

综述了超声波在一些聚合方法中的应用。     

水性含硅聚合物涂料的制备与应用

乳液聚合法是制备水性含硅聚合物最常见、最有效的方法。介绍了种子乳液聚合、核/壳乳液聚合、无皂乳液聚合、微乳液聚合、互穿网络聚合等制备水性含硅聚合物的方法,并对水性含硅聚合物涂料的应用做了探讨。