高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (S1): 227.

• 研究论文 • 上一篇    下一篇

ABA型聚L-丙氨酸-聚乙二醇嵌段共聚物的合成及其表征

张国林, 马建标   

  1. 南开大学高分子化学研究所吸附分离功能髙分子材料国家重点实验室, 天津 300071
  • 收稿日期:2001-07-04 出版日期:2001-12-31 发布日期:2001-12-31
  • 基金资助:

    国家自然科学基金(批准号:59773021)资助.

Synthesis and Characterization of an ABA Triblock Copolymer Consisting of Poly(L-Alanine Acid) as A Component and Poly(Ethylene Glycol) as B Component

ZHANG Guo-Lin, MA Jian-Biao   

  1. Institute of Polymer Chemistry, State Key Laboratory of Functional Polymer Materials for Adsorption and Separation, Nankai University, Tianjin 300071, China
  • Received:2001-07-04 Online:2001-12-31 Published:2001-12-31

摘要:

利用L-α-丙氨酸和三聚光气反应制备了N-羧基-α-丙氨酸-环内酸酐(NCA).以聚乙二醇(PEG)为原料.制备了端氨基聚乙二醇(PEG-NH2),并以此作为引发剂,引发NCA开环聚合.合成了不同组成和分子量的聚L-丙氨酸-聚乙二醇(PLAA-PEG-PLAA)嵌段共聚物.利用IR、1H NMR、DSC、WAXD、CD等方法对共聚物结构进行了表征.结果表明,PEG-NH2引发NCA开环聚合得到的是嵌段共聚物,通过1H NMR谱得到共聚物组成及数均分子量;引入PEG的结果使聚L-丙氨酸的亲水性有所改善;CD测诚结果表明共聚物在水溶液中主链主要以α-螺旋构象存在.

关键词: 聚L-&alpha, -丙氨酸, 开环聚合, 嵌段共聚物

Abstract:

N-Carboxy-L-Aianine acid anhydride (NCA) was synthesized by L-α-alanine and triphosgen. PEG was used to prepare amine-terminated poly(ethylene glycol) (PEG-NH2), which was used to initiate NCA open ring polymerization and produce PLAA-PEG-PLAA block copolymers of various contents and molecular weights. The structural characteristics of copolymers were shown by IR、1H NMR、DSC、WAXD、CD etc. The results showed that products of NCA open ring polymerization initiated by PEG-NH2 were block copolymers. Copolymer's contents and number-average molecular weights were obtained by 1H NMR. The hydrophilicity of PLAA were improved by adding PEG. The results of CD showed the copolymers in aqueous solution existed as α-helical conformation.

Key words: Poly(L-α-Alanine acid), Open ring polymerization, Block copolymer

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