ATR-FTIR STUDIES ON THE EFFECT OF THICKNESS ON THE CRYSTALLIZATION OF POLY(3-HYDROXYBUTYRATE) THIN FILMS

WANG Zhen; YANG Rui; XU Jun; XIE Xuming

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ATR-FTIR STUDIES ON THE EFFECT OF THICKNESS ON THE CRYSTALLIZATION OF POLY(3-HYDROXYBUTYRATE) THIN FILMS

Research Article | 更新时间：2021-03-19

- ATR-FTIR STUDIES ON THE EFFECT OF THICKNESS ON THE CRYSTALLIZATION OF POLY(3-HYDROXYBUTYRATE) THIN FILMS
- Acta Polymerica Sinica Issue 4, Pages: 611-616(2005)
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- Published：20 August 2005，
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WANG Zhen, YANG Rui, XU Jun, XIE Xuming. ATR-FTIR STUDIES ON THE EFFECT OF THICKNESS ON THE CRYSTALLIZATION OF POLY(3-HYDROXYBUTYRATE) THIN FILMS. [J]. Acta Polymerica Sinica (4):611-616(2005)
DOI：

WANG Zhen, YANG Rui, XU Jun, XIE Xuming. ATR-FTIR STUDIES ON THE EFFECT OF THICKNESS ON THE CRYSTALLIZATION OF POLY(3-HYDROXYBUTYRATE) THIN FILMS. [J]. Acta Polymerica Sinica (4):611-616(2005) DOI：

摘要

使用匀胶机(spincoater)

通过溶液铸膜的方法

在铝箔基板上制备出具有不同厚度的聚3羟基丁酸酯(PHB)薄膜.20℃室温条件下

通过衰减全反射傅立叶红外光谱(ATRFTIR)原位观测了不同厚度薄膜的结晶过程

并通过偏光ATRFTIR对薄膜中PHB分子的取向进行了研究.ATRFTIR原位观测结果显示

PHB在薄膜中的结晶速率以及结晶度均随着薄膜厚度的减小而逐渐降低;同时

偏光ATRFTIR测试结果表明

随膜厚减小

薄膜中结晶部分的PHB分子逐渐倾向于沿垂直于基板表面方向取向

膜越薄

倾向越明显.可以认为

PHB分子与基板间的相互作用以及扩散控制结晶导致了上述现象的产生.

Abstract

The crystallization of poly(3-hydroxybutyrate) (PHB) thin films was observed in situ by ATR (attenuated total reflection)-PTIR．The PHB films with different thickness were prepared by means of spin-coating on Al substrates

and then the isothermal crystallization of the PHB films at 200℃ was investigated in situ by ATR-FTIR The results revealed that the crystallization kinetics of PHB films was affected obviously by the film thickness．A reduction in the erystallinity as well as in the rate of crystallization was found with decreasing the film thickness．because the crystallization occurred under constrained geometry conditions．In addition

the effect of film thickness on the orientation of the molecules of the PHB crystals in the films was investigated by polarized ATR-FTIR．The results imply a preferred orientation of the polymer chain axis in the crystals along the surface-normal direction of the flints．The thinner the film thickness

the more the preferred crystalline chain orientation perpendicular to the film surface is.

关键词

PHB薄膜基板分子取向ATR-FTIR

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