高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (8): 1515.

• 论文 • 上一篇    下一篇

用固体高分辨NMR研究聚(L-丙氨酸)-聚乙二醇单甲醚双嵌段共聚物的微相结构与链段运动

伍国琳, 孙平川, 马建标   

  1. 南开大学高分子化学研究所, 吸附分离功能高分子材料国家重点实验室, 天津 300071
  • 收稿日期:2002-06-07 出版日期:2003-08-24 发布日期:2003-08-24
  • 通讯作者: 马建标(1959年出生),男,教授,博士生导师,从事功能高分子研究.E-mail:jbma@nankai.edu.cn E-mail:jbma@nankai.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:20174018);高等学校重点实验室访问学者基金资助

Microdomain Structure and Dynamics of Poly(L-alanine)-b-poly (ethylene glycol) Monomethyl Ether Diblock Coploymer Characterized by High Resolution Solid-state NMR

WU Guo-Lin, SUN Ping-Chuan, MA Jian-Biao   

  1. State Key Laboratory of Functional Polymer Materials for Adsorption and Separation, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
  • Received:2002-06-07 Online:2003-08-24 Published:2003-08-24

摘要: 利用固体高分辨13CCP/MAS及二维WISE核磁共振技术研究了聚(L-丙氨酸)-聚乙二醇单甲醚双嵌段共聚物(MPEG-b-PLA)在固态下的微相结构和链段运动行为.结果表明,聚乙二醇链段在形成嵌段共聚物后结晶度明显下降,同时存在晶区和非晶区,从而表现出两种不同的运动状态.而聚乙二醇链段的引入对聚L-丙氨酸链段影响不大,嵌段共聚物中聚L-丙氨酸链段高度结晶,同时含有大量的α螺旋结构,分子链运动严重受限,估计聚L-丙氨酸链段的相区尺寸很小.

关键词: 嵌段共聚物, 微相结构, 固体核磁共振

Abstract: The microdomain structure of poly(L-alanine)-b-poly(ethylene glycol)monomethyl ether, MPEG-PLA, used as a new amphiphilic diblock copolymer was characterized by proton spin diffusion experiments with 13C detection and 1 Hwideline separation 2D1H, 13CNMR experiment(WISE-NMRspectroscopy).The MPEG chains could form crystalline as well as amorphous phases, but the degree of crystallinity is considerably lower in the diblock polymer compared with MPEGhomopolymer.And the PLAblocks are very rigid as α-helix and β-sheet forms.The results imply that the region of α-helix forms is quite larger than β-sheet forms.

Key words: Block copolymer, Microdomain, Solid-state NMR

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