Stereoregularities of Ring-containing Polymethacrylates Obtained by Radical Polymerization
Stereoregularities of Ring-containing Polymethacrylates Obtained by Radical Polymerization
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自由基聚合获得的含环聚甲基丙烯酸酯的立构规整性
DOI：
10.1295/polymj.2.555
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发表时间：
1971
期刊：
影响因子：
--
通讯作者：
Y. Sakaguchi
中科院分区：
文献类型：
--
作者：
J. Nishino;H. Nakahata;Y. Sakaguchi
甲基丙烯酸苯基酯、甲基丙烯酸2-萘酯（2-Np-MA）、甲基丙烯酸1-萘酯（1-Np-MA）、甲基丙烯酸9-芴酯、甲基丙烯酸5，6，7，8-四氢-1-萘酯、甲基丙烯酸环己酯（CH-MA）、甲基丙烯酸环戊酯（CP-MA）和甲基丙烯酸十氢-2-萘酯（D-MA）在自由基引发剂作用下，在苯和正己烷中进行本体聚合。聚合物通过水解然后甲基化转化为聚（甲基丙烯酸甲酯）（PMMA）。通过比较衍生的PMMA的IR和NMR谱，研究了聚合物的亲水性。含芳族取代基的聚合物比传统的PMMA更全同立构，特别是在正己烷中制备的聚（2-Np-MA）和聚（1-Np-MA）的是相当全同立构。另一方面，聚（CH-MA）、聚（CP-MA）和聚（D-MA）的聚合度与常规PMMA的聚合度几乎相同。这些结果表明，甲基丙烯酸酯的芳环似乎促进了全同立构序列的形成，这种效果与萘基增强，但脂肪族环对这种立体调控的影响不大。
Phenyl, 2-naphthyl(2-Np-MA), 1-naphthyl(1-Np-MA), 9-fluorenyl, 5,6,7, 8-tetrahydro-1-naphthyl, cyclohexyl(CH-MA), cyclopentyl(CP-MA), and decahydro-2-naphthyl(D-MA) methacrylates were polymerized in bulk, benzene, and n-hexane by radical initiators. The polymers were converted into poly (methyl methacrylate)(PMMA) by hydrolysis followed by methylation. The tacticities of the polymers were studied by comparing the IR and NMR spectra of the derived PMMA’s. The polymers containing aromatic substituents were more isotactic than conventional PMMA, and especially poly(2-Np-MA) prepared in n-hexane and poly(1-Np-MA)’s were considerably isotactic. On the other hand, tacticities of poly(CH-MA)’s, poly(CP-MA)’s, and poly(D-MA)’s were nearly the same as those of conventional PMMA. These results suggest that aromatic rings of the methacrylates seem to promote the formation of isotactic sequence and this effect is enhanced with naphthyl groups, but the aliphatic rings have little effect on such stereoregulation.
用于检查污水管道内部的浮动全向摄像系统的提案及成像结果的考虑
DOI：
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发表时间：
2015
期刊：
影响因子：
--
作者：
前田拓磨;林友貴;澤野弘明;石原進
通讯作者：
石原進