中文文摘介绍了有机硅引发剂的种类、结构、性能及制备方法 ;阐明了引发剂在特定结构高分子合成中所起的重要作用。英文文摘The types , st ructure , properties , preparation , as well as the application in the synthesis of functional polymer of silicone initiators ...were introduced in this paper.
［中文文摘］研究了稳定自由基存在下苯乙烯的活性聚合 .发现在 2 ,2′ 联吡啶的存在下 ,苯乙烯聚合的分子量控制效果提高 ,分子量可控 ,分子量分布较窄 .在与丙二腈共同作用时 ,可在 4h内达到 85 %的转化率 ,分子量分布在 1 5以下 ,分子量控制误差在 2 0 %以下 .设计分子量在 1× 10 4 ～ 9× 10 4 的范围内 ,实测分子量和理论分子量相近 .［英文文摘］The ...living free radical polymerization of styrene was studied with benzoyl peroxide as the initiator in the presence of TEMPO (2,2,6,6 tetramethylpiperidinyl 1 oxy).It was found that styrene polymerization was distinctly accelerated by means of using malononitrile (MN) as additive.The purpose of this paper is to explore the effect of MN/bpy on the control of molecular weight.These mixture additives were able to control the polymerization of styrene to high conversion (85%) in 4 hours, and samples of molecular weight from 1 ×104 to 9 ×104 and withpolydispersities of 1. 15 to 1. 4 were readily obtained. In comparison with the polymerization without any additives ,these systems represented a dramatic improvement in the ability to control the molecular weight . The molecularweight of the polymer gradually increased with ti
中文文摘研究了以 2 ,2 ,6 ,6 -四甲基 - 1-哌啶氧化物 (TEMPO)作为稳定自由基 ,过氧化苯甲酰(BPO)为引发剂 ,丙二腈 (MN)为加速剂 ,极性单体甲基丙烯酸甲酯的聚合 .在丙二腈的促进下 ,聚合速率明显加快 ,4h可达 89%的转化率 .在聚合过程中 ,分子量变化不大 ,分子量分布较窄 .随着聚合体系温度提高 ,转化率随之升高 ,到达 12 0℃后 ,转化率反而下降 ...,分散性变化不大 .12 0℃为其较理想的聚合温度 .通过对模型聚合物的核磁共振 (1HNMR)分析 ,发现氧氮自由基部分脱落 ,解释了极性单体不能在稳定自由基存在下进行活性聚合的原因 .对氧氮自由基易从主链脱落的可能解释是两个腈基的强吸电子效应削弱了C -O键 ,从而使氧氮自由基与主链的连接减弱 ,导致分子量不可控制。英文文摘Poly (methyl methacrylate) was synthesized starting from benzoyl peroxide and TEMPO (2,2,6,6-tetramethylpiperidinyl-1-oxy). It was found that nitroxide mediated polymerization of methyl methacrylate was distinctly accelerated by the addition of small amount of malononitrile (MN). During the whole course, the polydispersities were narrow and the molecular weight didn't increase with conversion and time. When the reaction temperature was enhanced, the rates increased but when the temperature reached 120℃, they stopped increasing and began to drop and the polydispersities kept low. 120 ℃was the optimal temperature for this system. Through the 1H NMR an
中文文摘 对由无皂乳液聚合法合成的苯乙烯 丙烯酸丁酯 十一烯酸钠高分子电解质 P (St BA UA Na+) 胶乳微球在离子介质中的物理化学行为进行了讨论。利用透射电子显微镜 (TEM)对不同介质条件下胶乳微球的形态、粒径及其分布进行了表征 ,认为 Na UA参与了 St、BA的共聚合键连于高分子链上可极大地提高乳化效率和乳液的稳定性 ,其用量对乳胶粒径影响较大 ,介质 p ...H对胶乳粒径分布有较大影响。英文文摘The physicol chemical properties of P (styrene buthyl acrylate sodium undecylenate) electrolyte microsphere synthesised by emulsifier free emulsion polymerization were studied under the condition of ionic environment. The form, particle diameter and particle diameter distribution of polyelectrolyte microsphere under the different pH were characterized by transmission electron micrography(TEM). After having participated copolymerization with St, BA, NaUA bonded emulsion particle, thus, it can heighten emulstification efficiency and stability of emulsion The particle diameterof latex and the particle diameter distribution can be influenced by the amount of NaUA and pH of system respectively.
