Synthesis and characterization of polypropylene-based polymer hybrids linking poly(methyl methacrylate) and poly(2-hydroxyethyl methacrylate)
Synthesis and characterization of polypropylene-based polymer hybrids linking poly(methyl methacrylate) and poly(2-hydroxyethyl methacrylate)
复制标题
DOI：
10.1016/j.polymer.2008.08.032
复制
发表时间：
2008-10
期刊：
影响因子：
4.6
通讯作者：
H. Kaneko;Junji Saito;N. Kawahara;S. Matsuo;T. Matsugi;N. Kashiwa
中科院分区：
文献类型：
--
作者：
H. Kaneko;Junji Saito;N. Kawahara;S. Matsuo;T. Matsugi;N. Kashiwa
通过马来酸酐改性聚丙烯（PP-MAH）的接枝共聚，成功合成了连接聚（甲基丙烯酸甲酯）（PMMA）和聚（甲基丙烯酸2-羟乙酯）（PHEMA）的全同立构聚丙烯聚合物杂化物。 PP-MAH与乙醇胺反应生成含羟基的聚丙烯(PP-OH)，将由此获得的PP-OH用2-溴异丁酰溴处理并转化为含2-溴异丁酰基的聚丙烯(PP-Br)。使用铜催化剂体系在邻二甲苯溶液中于 100°C 下进行 MMA 与 PP-Br 的金属催化自由基聚合，得到连接 PMMA 链段的 PP 基聚合物杂化物（PP-PMMA 杂化物）。由此获得的 PP-PMMA 杂化物表现出比 PP-Br 更高的熔化温度，并且由于两个片段之间的化学连接而具有纳米级的微相分离形态。另一方面，通过 HEMA 与 PP-Br 在邻二甲苯浆料中于 25°C 进行自由基聚合，也获得了连接 PHEMA 片段的聚合物杂化物（PP-PHEMA 杂化物）。 TEM观察表明聚合反应主要在PP-Br粉末的表面引发，导致了独特的核壳形貌。由于 PHEMA 链段的亲水性，这些 PP-PHEMA 杂化粉末表现出良好的水亲和力。
Isotactic polypropylene-based polymer hybrids linking poly(methyl methacrylate) (PMMA) and poly(2-hydroxyethyl methacrylate) (PHEMA) were successfully synthesized by a graft copolymerization from maleic anhydride-modified polypropylene (PP-MAH). PP-MAH reacted with ethanolamine to produce a hydroxyl group containing polypropylene (PP-OH) and the thus obtained PP-OH was treated with 2-bromoisobutyryl bromide and converted to a 2-bromoisobutyryl group containing polypropylene (PP-Br). The metal-catalyzed radical polymerization of MMA with PP-Br was performed using a copper catalyst system in o-xylene solution at 100°C to give the PP-based polymer hybrids linking PMMA segments (PP–PMMA hybrids). Thus obtained PP–PMMA hybrids demonstrated higher melting temperature than PP-Br and microphase-separation morphology at the nanometer level owing to the chemical linkage between both segments. On the other hand, the polymer hybrids linking PHEMA segment (PP–PHEMA hybrids) were also obtained by the radical polymerization of HEMA with PP-Br in o-xylene slurry at 25°C. TEM observation suggested that the polymerization mainly initiated on the surface of the PP-Br powder, led to the peculiar core–shell-like morphology. These PP–PHEMA hybrid powders showed a good affinity with water due to the hydrophilicity of the PHEMA segments.