Confined crystallization and phase transition in semi-rigid chitosan containing long chain alkyl groups

被引：36

作者：

Zhou, Yong ^{[2
]}

Shi, Haifeng ^{[1
]}

Zhao, Ying ^{[2
]}

Men, Yongfeng ^{[3
]}

Jiang, Shichun ^{[3
]}

Rottstegge, Joerg ^{[2
]}

Wang, Dujin ^{[2
]}

机构：

[1] Tianjin Polytech Univ, State Key Lab Hollow Fiber Membrane Mat & Proc, Inst Funct Fiber, Tianjin 300160, Peoples R China

[2] Chinese Acad Sci, Inst Chem, CAS Key Lab Engn Plast, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China

[3] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China

来源：

CRYSTENGCOMM | 2011年 / 13卷 / 02期

基金：

中国国家自然科学基金;

关键词：

COMB-LIKE POLYMERS; X-RAY-SCATTERING; FLEXIBLE SIDE-CHAINS; C-13; CHEMICAL-SHIFTS; RIGID-ROD POLYMERS; SOLID-STATE; NORMAL-TRITRIACONTANE; SEGMENTAL DYNAMICS; MOLECULAR-MOTION; DEFECT STRUCTURE;

D O I：

10.1039/c0ce00165a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report on the confined crystallization and polymorphism behavior of a series of comb-like polymers (CS(n)Cs), which were prepared via an N-alkylation reaction between chitosan and n-alkyl bromides (n = 14-20). Analysis by temperature-dependent synchrotron X-ray scattering, Fourier transform infrared spectroscopy (FTIR), solid-state nuclear magnetic resonance spectroscopy (NMR) and differential scanning calorimetry (DSC) revealed that the phase transition and crystalline structure were sensitively controlled by the length scale and the confinement state of alkyl groups, which could induce different packing structures and conformational variation behavior. Remarkably, phase transition from orthorhombic-hexagonal to monoclinic structure was observed for these side-chain polymers, demonstrating that the length scales of alkyl groups and the microstructure of polymeric backbones play an important role in the evolution of packing mode of nano-crystallites.

引用

页码：561 / 567

页数：7

共 47 条

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