(2-甲基丙烯酰氧乙基)三甲基氯化铵-丙烯酰胺反相微乳液共聚合研究

采用SPAN-OP复合乳化剂和K_2S_2O_8-Na_2SO_3氧化还原引发剂,进行(2-甲基丙烯酰氧乙基)三甲基氯化铵-丙烯酰胺的反相微乳液共聚合。测得单体的竞聚率r_(DM·MC)=1.11±0.16,r_(AM)=0.53±0.08。在单体总浓度为20—40％(wt),引发剂浓度为0.01—0.05％,乳化剂浓度为10—18％,聚合温度为299K的条件下,得到共聚反应动力学方程:R_p=k[M]~(1.07)[I]~(0.52)[E]~(0.90),文中对上述结果做了解释。     

Solid-State polymerization of the binary mixture of methacrylate and liquid-crystalline compound by electron beam

Solid-state polymerization of a binary mixture of nonliquid-crystalline monomer and liquidcrystalline compound was carried out using electron beam. The monomers were benzoic acid containing 4-[ω-(meth)acryloyloxyalkyloxy] benzoic acids, in which the alkylene spacer was ethylene, hexamethylene, or undecamethylene. The conversion yield of monomer to polymer to a large extent increased with increasing content of a liquid-crystalline compound with a terminal carboxylic group, such as 4-n-alkyloxybenzoic acid, while the addition of a liquid-crystalline compound without terminal carboxylic group did not affect polymerization of the monomer. Phase diagrams of the mixture of monomer and liquid-crystalline compound were examined using cross-polarizing microscopy and differential scanning calorimetry (DSC). All mixtures of monomer and 4-n-alkyloxybenzoic acid or liquid-crystalline compound without terminal carboxylic group showed liquid-crystallinity in a broad composition range. It was concluded that liquid-crystalline compounds with terminal carboxylic acid may form hydrogen bondings with methacrylate or acrylate monomer having terminal carboxylic acid which enhance polymerizability of the mixture. The stereoregularity of polymers determined by NMR depended on increasing irradiation dose and temperature rather than the content of the added liquid-crystalline 4-n-decanoxybenzoic acid.     

偏氟乙烯的聚合反应

本文研究了用有机引发剂引发偏氟乙烯的水相聚合,并对制得的聚偏氟乙烯的性质进行了研究。有机引发剂引发聚合的聚偏氟乙烯的热稳定性、强度、结晶度和熔点均比用过硫酸盐引发聚合的聚偏氟乙烯高。     

大分子引发－转移－终止剂

大分子引发－转移－终止剂杨文君，李俊柏，沈家骢（青岛化工学院橡塑工程研究所，青岛，２６６０４２）（吉林大学化学系，长春，１３００２３）关键词聚苯乙烯，聚丙烯酰胺，嵌段共聚，扩链反应，引发－转移－终止剂含有二乙基二硫代氨基甲酸基的有机硫化物或大分子，在...     

数均聚合度计算的教学方法

总结毛者提出的线型缩聚中当量系数的新定义及引入缩聚体系单体平均官能度的新方法，本文总结出了一套讲授数均聚合度计算问题的简单方法。     

Preparation of holographic gratings of liquid crystals dispersed in polyurethane acrylates under controlled reaction conditions.

Transmission gratings of holographic polymer-dispersed liquid crystals (HPDLC) are prepared under controlled reaction conditions by adding various amounts of chain-transfer agent (CTA). The resulting films have a higher gel content with lower cross-link density, less dark reaction, less grating shrinkage with much smoother LC/polymer interfaces, smaller induction period, and fast saturation of diffraction efficiency, which shows a maximum of 95 % with 1 % CTA. An optimum LC content of 35 % is verified on the basis of morphology and reaction kinetics.     

正丁基锂四氢呋喃引发α-甲基苯乙烯阴离子平衡聚合动力学及反应机理研究

本文研究了以正丁基锂为引发剂,四氢呋喃为添加剂,环己烷为溶剂中的α-甲基苯乙烯阴离子平衡聚合动力学。讨论了体系中的反应活性种;提出了聚合机理;得到了聚合温度为20℃时的平衡单体浓度与活性种速率常数及添加剂浓度之间的关系式。     

带功能基的全氟烷基乙烯基醚的研究——4.四氟乙烯与全氟-3,6-二氧杂-4-甲基-△~7-辛基磺酰氟溶液共聚反应单体竞聚率的测定

在乙烯-四氟乙烯溶液共聚合体系研究中,我们曾编制了一个简易的计算机程序,用于测定二种单体的共聚竞聚率,这一方法计算方便,而且可以避免原先作图法中的误差,结果较为可靠。前文我们报道了四氟乙烯与两个新的全氟烷基乙烯基醚的共聚合反应,并对其中一个新单体——7,7-二氯-3-氧杂-全氟庚烯-1——与四氟乙烯的共聚进行了单体竞聚率的测定。结果表明,这一新的含氟烯醚单体的聚合活性较其它已有报道的同类单体大。为了验证这一     

MgCl_2晶型对丙烯聚合MgCl_2载体催化剂活性的影响

ＭｇＣｌ_２晶型对丙烯聚合ＭｇＣｌ_２载体催化剂活性的影响张明辉，肖世镜中国科学院化学研究所，北京，１００８０）关键词丙烯聚合、ＭｇＣｌ２、载体催化剂近年来，有关ＭｇＣＩ。载体催化剂的研究报道和综述文章不少，但涉及载体晶型对催化剂结构性能的影响却少见．...