PLLA Mesophase and Its Phase Transition Behavior in the PLLA-PEG-PLLA Copolymer As Revealed by Infrared Spectroscopy

被引：119

作者：

Zhang, Jianming ^{[1
]}

Duan, Yongxin ^{[1
]}

Domb, Abraham J. ^{[2
]}

Ozaki, Yukihiro ^{[3
,4
]}

机构：

[1] Qingdao Univ Sci & Technol, Minist Educ, Key Lab Rubber Plast, Qingdao 266042, Peoples R China

[2] Hebrew Univ Jerusalem, Fac Med, Sch Pharm, Dept Med Chem, IL-91120 Jerusalem, Israel

[3] Kwansei Gakuin Univ, Dept Chem, Sch Sci & Technol, Gakuen, Sanda 6691337, Japan

[4] Kwansei Gakuin Univ, Res Ctr Environm Friendly Polymers, Gakuen, Sanda 6691337, Japan

来源：

MACROMOLECULES | 2010年 / 43卷 / 09期

关键词：

POLY(L-LACTIC ACID); DIBLOCK COPOLYMERS; MESOMORPHIC PHASE; CRYSTALLIZATION; CRYSTAL; STEREOCOMPLEXES;

D O I：

10.1021/ma100301h

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A detailed analysis of the IR spectrum of melt-quenched PLLA-PEG-PLLA sample and its change with temperature is presented. It was found that, in the initial state of the melt-quenched PLLA-PEG-PLLA sample, the PLLA constituent does not exist as a normal amorphous or crystalline phase but as a kind of mesophase, which is confirmed by the WAXD data. The IR data suggest that both chain conformation and chain packing arc disordered to some extent in such a mesophase. Therefore, this mesophase is less thermally stable than the ordered a phase and even the disordered alpha phase (alpha') of PLLA. In the heating process, the mesophase of PLLA in the PLLA-PEG-PLLA copolymer starts the partial melt first upon heating in a stepwise way, and subsequently it is reorganized directly into the stable alpha phase but not through the alpha' phase of PLLA. These phase transition behaviors are examined and discussed at the molecular functional group level.

引用

页码：4240 / 4246

页数：7

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