共查询到18条相似文献，搜索用时 109 毫秒
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本文首先发现了硫醇在相当于引发剂用量范围内,在常温下能够诱发甲基丙烯酸甲酯与丙烯腈的共聚反应.并研究了该共聚反应的动力学、聚合物组成及分子量等有关问题. 相似文献
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本文研究了N,N—二甲基苯胺在催化量情况下引发甲基丙烯酸甲酯的聚合反应,并讨论了该聚合反应的动力学等有关问题. 相似文献
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超临界CO2做溶剂及携带剂,协助甲基丙烯酸甲酯/丙烯酸改性丝素蛋白纤维.研究了各种实验条件对纤维增重率的影响.插嵌时间4 h后增重率变化不再明显;改变压力,增重率有极值出现;随单体浓度的增加,增重率增大. 相似文献
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环保型水性上光油的制备及性能 总被引：1，自引：0，他引：1
采用半连续种子乳液聚合的方法,选择合适的单体进行乳液聚合,合成了印刷用环保型上光油,探讨了丙烯酸丁酯和甲基丙烯酸甲酯的比例、乳化剂的种类和用量、引发剂用量及pH值对乳液性能的影响,结果表明：丙烯酸丁酯和甲基丙烯酸甲酯比例为0．85,OP-10与SDS组成的复合乳化剂用量为2．5％,引发荆为0．25％时最佳,该上光油具有光泽好,耐化学品性能强,稳定性良好等特点。 相似文献
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基于甲基丙烯酸甲酯的自由基悬浮聚合基本原理,采用控制变量法,探讨了料剂比、搅拌速度、引发剂的用量等对聚甲基丙烯酸甲酯颗粒大小、均匀程度和产率的影响因素.结果表明:在单体用量固定为10 mL,分散剂为水溶性聚乙烯醇的情况下,其悬浮聚合的最佳反应条件为:料剂比为1∶6、搅拌速度为250 r/min、分散剂为浓度5％的聚乙烯醇10mL,引发剂AIBN用量为0.12g、反应温度为76～78℃.在这样条件下,聚合反应能顺利完成,形成的聚合物颗粒大小适中、形状均匀,产率较高,最高可达82.4％. 相似文献
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刘洪波 《顺德职业技术学院学报》2010,8(1):7-9
研究了碳-碳引发转移终止剂（iniferter）对甲基丙烯酸甲酯聚合反应的影响,实验结果表明：引发剂取代基位阻效应的增大将降低初级自由基与单体的加成反应速率,进而降低聚合反应速度：位阻效应的增加尽管也同时降低了初级自由基与增长自由基的偶合反应速率,但也使聚合物末端的活性端基更容易均裂,从而能够使体系中保持较高的初级自由基浓度,更有利于对聚合反应的控制。 相似文献
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DHARMALINGAM K. RAMACHANDRAN K. SIVAGURUNATHAN P. 《浙江大学学报(A卷英文版)》2006,7(11):1928-1931
INTRODUCTION Hydrogen bonds constitute a very interesting class of intermolecular interactions, which are of extreme importance in many fields of chemistry and molecular biology. Acrylic esters are industrially important chemicals and precursors in the synthesis of polymers (Schildknecht, 1977). Alcohols play an important role in many chemical reactions due to the ability to undergo self-association with manifold internal structures and are in wide use in industry and science as reagents,… 相似文献
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Tan Dingsheng 《上海大学学报(英文版)》1998,2(1):67-71
ＳｔｕｄｙｏｎＳｕｒｆａｃｅＭｏｄｉｆｉｃａｔｉｏｎｏｆＴｉｔａｎｉｕｍＤｉｏｘｉｄｅＵｓｉｎｇＰｏｌｙｍｅｔｈｙｌＭｅｔｈａｃｒｙｌａｔｅＴａｎＤｉｎｇｓｈｅｎｇ（ＳｈａｎｇｈａｉＵｎｉｖｅｒｓｉｔｙ）ＹａｎＮｉａｎｘｉＸｕｅＱｉｎｇ（Ｓｏｃｈｏｗ... 相似文献
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以过氧化苯甲酰（BPO）为引发剂,甲基丙烯酸甲酯（MMA）为单体进行本体聚合制备有机玻璃。探讨了引发剂的用量、不同阶段的反应温度等因素对反应的影响。得出最佳实验条件为：m（BPO）／m（MMA）为0．3％;-N聚水浴温度为90℃,预聚时间为1．5h;烘箱中聚合前期温度为45％,24h后升温至90℃再聚合2h。 相似文献
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研究了N－丙烯酰吩噻嗪（APT）敏化甲基丙烯酸甲酯（MMA）的光聚合，得到了APT敏化MMA光聚合的速度方程和表观活化能并探讨了引发机理。 相似文献
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左晓兵 《常熟理工学院学报》1999,13(2):80-83,87
采用甲基丙烯酸甲酯、甲基丙烯酸、苯乙烯及二乙烯苯组成四元共聚体系,通过本体聚合制备出一系列耐热透明有机玻璃板材。研究了各改性组分对共聚物热形变温度的影响,测定了共聚物的玻璃化温度,结果表明,苯乙烯用量２５－３０％,甲基丙烯酸１０－１２％,二乙烯苯１－２％时的改性效果较好。 相似文献
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Methyl methacrylate (MMA) emulsion polymerization in the presence of nanometer calcium carbonate (nano-CaCO3) surface modified with (-methacryloxypropyltrimethoxysilane (MPTMS) was carried out to prepare poly (methyl methacrylate) (PMMA)/nano-CaCO3 composite. The reaction between nano-CaCO3 and MPTMS, and the grafting of PMMA onto nano-CaCO3 were confirmed by infrared spectrum. The grafting ratio and grafting efficiency of PMMA on nano-CaCO3 modified with MPTMS were much higher than that on nano-CaCO3 modified with stearic acid. The grafting ratio of PMMA increased as the weight ratio between MMA and nano-CaCO3 increased, while the grafting efficiency of PMMA decreased. Transmission electron micrograph showed that nano-CaCO3 covered with PMMA was formed by in-situ emulsion polymerization. 相似文献
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A new catalyst composed of Tin-bridged yttrocene Ph2Sn(MeCp)2YCI (MeCp=methylcyclopentadienyl) and Al (i-Bu)3 was successfully developed for the polymerization of methyl methacrylate (MMA). Detailed study of factors (such as the molar
ratio of Al/Cat., catalyst concentration, various solvents, temperature and time) influencing polymerization reaction indicated
that the catalytic active species may be still somewhat stable at high temperature and still have a long catalytic lifetime.1H NMR spectrum showed about 65% syndiotactic content in the polymethyl methacrylate (PMMA) prepared. From kinetic studies,
the polymerization rate equation may be expressed as Rp=Kp[Cat.]2.4. The overall activation energy of polymerization is 20.9±3.1 kJ/mol.
Project(29774021) supported by the Natural Science Foundation of China and National Laboratory of Element-Organic Chemistry,
Nakai, University. 相似文献