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2-亚甲基-丁二酯酐和甲基丙烯酸甲酯在四氢呋喃中以过氧化二苯甲酰作引发剂进行自由基共聚合。由作图法求得这两种单体在66℃的共聚竞聚率:r1=4.22,r2=0.64,表明它们趋于嵌均共聚。用粘度法和GPC测量了共聚物的分子量和分子量分布。 相似文献
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采用甲基丙烯酸甲酯-苯乙烯自由基共聚合微型化实验,研究了微型化实验条件下,聚合反应工艺条件对共聚产物性能及转化率的影响,说明了高分子微型化实验的可行性。同时,通过微型实验与常规实验相比,进一步阐述微型高分子化学实验不仅装置精巧、新颖,还有利于减少火灾、爆炸等事故的发生几率,而且原料用量及废液量大幅减少,具有节约和环保的双重意义。微型化学实验由于简化了实验装置和实验操作,将其用在教学或科研上,比起常规实验更加简单易行、安全可靠。 相似文献
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<正> 对反丁烯二酸酯(DRPs)类单休的均实反应研究已有许多报道。研究结果表明,所有的正烷基酯基DRFs单体,如反丁烯二酸二王丙酯等,均表现出很低的聚合反应活性,因而得不到高分子量的均聚物;而某些非正烷基酯的DRFs单体,如反丁烯二酸二异丙酯则显示出很高的聚合反应活性并可形成高分子量的聚合物。对反丁烯二酸酯同其他乙烯类单体(如苯乙烯等)的共聚研究曾有一些报道,但对DRFs单体之间的共聚 相似文献
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聚氧乙烯大单体与甲基丙烯酸甲酯的共聚合及其共聚物的研究 总被引:2,自引:0,他引:2
研究了聚氧乙烯(PEO)大单体与甲基丙烯酸甲酯的溶液共聚合,考察了引发剂用量,单体总浓度、投料比、反应时间对共聚物组成和分子量的,IR、HNMR、GPC、VPO、DSC航透射电等测定结果表明,经纯化的共聚物具有预期的结构,且呈现微相分离,体外人体正常抗凝血浆复钙时间测定结果显示:共聚物的抗凝血明显好于玻璃和PMMA均聚物,且随共聚物中PEO含量的增加而增强,经水化处理的共聚物的抗凝血性比未经处理的 相似文献
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运用数据处理软件(maple)对经典的自由基二元聚合公式进行图形绘制,得到了二元单体之间共聚关系的三组图.一是二元单体的自由基共聚曲线图F1-f1,二是聚合物中单体平均组成(Fp)与投料单体浓度(f1)的关系曲线图,三是聚合物转化率(C)与投料单体(f1)的关系曲线图.通过二组具有代表性的共聚实例,分别是有恒比点的非理... 相似文献
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在杷来酸酐-苯乙烯本体聚合反应过程中,于70℃和低引发剂浓度(0.59-1.8×10^-3mol/L条件下,共聚物组成与单体的配比无关,生成无规共聚物;在高引发剂浓度(2×10^-2mol/L),随马来酸酐单体含量的增加,趋向生成1:1交替共聚物,温度的提高可以使生砀共聚物结构向1:1组成移动,当温度超过140℃时将生成无规共聚物,在本体聚合反应体系中,存在共聚反应和苯乙烯的均聚反应,而且随着的提 相似文献
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The copolymerization of acrylonitrile (AN) in dimethylformamide (DMF) was retarded by the presence of itaconic acid (IA) comonomer. Addition of TEA helped overcome the retardation at enhanced concentrations of IA in the feed. The monomer reactivity ratios determined by both terminal and penultimate models revealed that the overall monomer reactivity’s are practically unaffected by the presence of TEA. The penultimate-unit effect for radicals terminated in AN was enhanced by the presence of TEA. Higher TEA concentrations helped regain the reactivities of AN and IA to AN-radical to the state in pure DMF. The penultimate model could explain the feed-copolymer composition profile for the whole range. Whereas IA systematically retarded the polymerization rate at all concentration regime in DMF, it increased the rate at higher IA concentration in DMF/TEA system. For a given IA concentration, the polymerization rate decreased as the solvent is enriched in TEA. The copolymers synthesized in the presence of TEA, manifested higher cyclization temperature and consequently lower char residue, attributed to the incorporation of TEA in the polymer by means of salt formation with IA moiety camouflaging the catalytic effect of the -COOH group in cyclization reaction. 13C-NMR studies confirmed the incorporation of the TEA molecules in the polymer chain. 相似文献
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自从研制出克量的C6 0 [1],其在超导光、电、磁、生物等领域的研究迅速发展 .由于C6 0 只溶于几种非极性溶剂中 ,其使用受到限制 ,从而制备C6 0 的高分子衍生物一直被认为是C6 0 材料化的重要途径[2 6 ].文献 [39]报道 ,富勒烯与含双键的单体如苯乙烯、甲基丙烯酸甲酯等可很方便地进行自由基共聚 ,得到富勒烯与烯类单体的共聚物 ,产物可溶于四氢呋喃等有机溶剂 .但迄今为止 ,可溶于水或其它强极性溶剂中的C6 0 聚合物研究的很少[10 ,11],而C6 0 的三元共聚物的制备几乎未见报道 ,为此 ,我们采用自由基共聚制备了C6 0 苯乙烯 顺丁烯… 相似文献
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甲基丙烯酸甲酯和联苯酯的基团转移共聚邹友思,林国良,姚青青,潘容华(厦门大学化学系,厦门,361005)关键词基团转移共聚,竞聚率,甲基丙烯酸甲酯,甲基丙烯酸联苯酯前文[1]报道了基团转移嵌段共聚的结果,用混合投料的方法进行了基团转移无规共聚并研究了... 相似文献
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The simultaneous gravimetric and dilatometric techniques have been used to study the kinetics of aqueous free radical crosslinking copolymerization of acrylamide (AAm) and N,N'-methylenebisacrylamide (MBA) at different crosslinker ratios, and reaction temperatures. In this study, the gel properties were investigated using swelling measurements and microscopic techniques. Based on the data, it was proposed that the deviation point of the results of dilatometric technique from those of the gravimetric one can be a new criterion for gel point. The monomer conversion and the equilibrium swelling ratio of the hydrogels were measured as a function of the reaction time. Experimental data showed an inverse dependence of the critical gel point on crosslinker concentration. As the MBA/AAm ratio was decreased to 0.1?wt%, the product appearance changed. In addition, the effects of temperature on the reaction rate and critical gel point were studied. At higher temperatures, the equilibrium swelling ratio reached to its minimum value earlier. Besides, the hydrogel surface became smoother. 相似文献
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It is well known that maleic anhydride (MAH) behaves as an electron acceptor and forms charge-transfer complexes with donor monomers such as styrene (ST) [1,2], divinyl ether [3], and some of other olefms [4–61. The charge-transfer polymerization of ST with MAH has been extensively studied [1,7–11]. On the other hand, L-ascorbic acid (L-Asc) in combination with a suitable oxidants proved to be an efficient redox initiator for various vinyl polymerizations. Misra et al. [12] showed that the reduction of peroxides by ascorbic acid follows a chain mechanism with ascorbate and other free radicals as intermediates. Thus, we can expect that such an electron donor might initiate the copolymerization of MAH with ST. 相似文献
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Ring-opening Copolymerization of Adipic Anhydride and Propylene Oxide Catalyzed by Yttrium Triflates
CHEN Feng ZHU Wei-pu SHEN Zhi-quan Institute of Polymer Science Key Laboratory of Macromolecule Synthesis Functionalization Ministry of Education Zhejiang University Hangzhou P. R. China 《高等学校化学研究》2009,25(3)
The ring-opening copolymerization of adipic anhydride with propylene oxide was carried out with yttrium triflates as a catalyst. Poly(propylene adipate) could be synthesized by controlling the copolymerization conditions. The copolymerization procedure was tracked by 1H NMR analyses. 相似文献