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具有光学活性的两亲性聚炔聚乙二醇单甲醚接枝共聚物的合成与表征

DOI: 10.3724/SP.J.1105.2011.10057, PP. 281-286

Keywords: 聚炔,光学活性,螺旋结构,两亲共聚物

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Abstract:

设计并合成了含手性侧基和含亲水性大分子侧基的接枝聚炔共聚物[聚(丙炔酸薄荷醇酯-co-丙炔酸聚乙二醇单甲醚酯)(poly(a-co-b),(apropiolicacidL\|mentholester;bpropiolicacidpolyethyleneglycolmonomethyletherester)).通过比旋光度([α]D),圆二色光谱(CD)表征手段发现共聚物poly(a-co-b)具有很强的光学活性且能形成单一方向的螺旋构象.另外还考察了共聚物中聚乙二醇单甲醚(MPEG)含量、溶剂极性及时间对共聚物的光学活性和二级结构的影响,结果表明,随着MPEG含量的增加,共聚物的光学活性会降低.在所选的4种溶剂中(三氯甲烷,四氢呋喃,二氯甲烷,苯),共聚物的螺旋构象在三氯甲烷溶剂中最能稳定存在.然而此类共聚物的二级结构在溶剂中是不稳定的,其光学活性会随着时间的延长而逐渐减弱.

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