摘要
本文首次报道了稀土镧离子Ｌａ（Ⅲ）与壳聚糖（ＣＳ）配位聚合物（Ｌａ－ＣＳ）的形成、该配位聚合物的ｘ射线光电子能谱、红外光谱、热分析、紫外光谱和电导率的表征和Ｌａ－ＣＳ配位聚合物在Ｎａ２ＳＯ３的存在下对于甲基丙烯酸甲酯（ＭＭＡ）聚合反应的催化作用。结果表明，配位聚合物中配体ＣＳ的仲羟基氧原子和氨基氮原子均参与与配位，Ｌａ（Ⅲ）与ＣＳ单体单元的配位比是１∶５，即Ｌａ（Ⅲ）的配位数是１０。Ｌａ－ＣＳ配位聚合物－Ｎａ２ＳＯ３体系对ＭＭＡ聚合具有较高的催化活性，聚甲基丙烯酸甲酯（ＰＭＭＡ）收率达７５％以上，ＭＭＡ按自由基机理进行聚合。
In this paper,formation of lanthanum(La)-chitosan(CS) coordination polymer is reported.The coordination polymer is characterized by x-ray photoelectron spectroscopy,infrared spectra,thermal analysis,ultraviolet spectra and specific conductivity.The result shows that the La-CS coordination polymer involves five oxygen atoms and five nitrogen atoms of five chitosan residues per La ion,so the coordination number is 10. The catalytic activity of the La-CS coordination polymer-Na 2SO 3 for the polymerization of MMA is also reported.The yield of PMMA is more than 75%.The free radical mechanism for the polymerization of MMA is proposed.
出处
《稀土》
EI
CAS
CSCD
北大核心
1997年第5期20-23,37,共5页
Chinese Rare Earths
基金
福建省自然科学基金
关键词
镧
壳聚糖
配位聚合物
催化剂
PWMA
La(Ⅲ),chitosan, coordination polymer, catalysis,polymerization
