Preparation of Chitin/Polystyrene Hybrid Materials by Efficient Graft Copolymerization Based on Mercaptochitin
Preparation of Chitin/Polystyrene Hybrid Materials by Efficient Graft Copolymerization Based on Mercaptochitin
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基于巯基甲壳素的高效接枝共聚制备甲壳素/聚苯乙烯杂化材料
DOI：
10.1021/ma951184i
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发表时间：
1996
期刊：
影响因子：
5.5
通讯作者：
S. Nishimura
中科院分区：
文献类型：
--
作者：
K. Kurita;Soichiro Hashimoto;H. Yoshino;S. Ishii;S. Nishimura
研究了苯乙烯与巯基甲壳素的接枝共聚反应。甲壳素首先被甲酰化，得到甲酰甲壳素，随后转化为巯基甲壳素。虽然接枝共聚是在悬浮液中进行的，但它可以有效地得到具有聚苯乙烯分支的几丁质衍生物，这是一种由天然多糖和合成聚合物组成的新型杂化材料。在适当的条件下，接枝率可达970%，表明巯基甲壳素作为引发剂对苯乙烯的聚合反应效率高。所得接枝共聚物在115℃时表现出玻璃化转变现象，并且由于引入聚苯乙烯支链而在有机溶剂中表现出高溶胀性。接枝率为940%的接枝共聚物分离得到的聚苯乙烯的Mn、Mw和Mw/Mn值分别为9.74 × 104、2.55 × 105和2.62。帖前……
Graft copolymerization of styrene onto mercaptochitin has been examined. Chitin was first tosylated to give tosylchitin, which was subsequently transformed into mercaptochitin. Athough the graft copolymerization was carried out in suspension, it proceeded efficiently to give chitin derivatives having polystyrene branches, a novel type of hybrid materials composed of a natural polysaccharide and a synthetic polymer. Under appropriate conditions, the grafting percentage reached 970%, indicating the high efficiency of the mercaptochitin as an initiator for the polymerization of styrene. The resulting graft copolymers exhibited glass transition phenomena at 115 °C and showed high swelling in organic solvents as a result of the introduction of polystyrene branches. Hydrolytic degradation of the chitin main chain allowed the isolation of the side chains, and the polystyrene isolated from the graft copolymer with a grafting percentage of 940% had Mn, Mw, and Mw/Mn values of 9.74 × 104, 2.55 × 105, and 2.62. Thes...