PNIPAAm-GRAFTED LAYERS ON POLYPROPYLENE FILMS Ⅱ. SURFACE PROPERTIES AND TEMPERATURE SENSITIVITY STUDY

LI Bin; CHEN Wenguang; WANG Xiaogong; ZHOU Qixiang

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PNIPAAm-GRAFTED LAYERS ON POLYPROPYLENE FILMS Ⅱ. SURFACE PROPERTIES AND TEMPERATURE SENSITIVITY STUDY

Research Article | 更新时间：2021-03-19

- PNIPAAm-GRAFTED LAYERS ON POLYPROPYLENE FILMS Ⅱ. SURFACE PROPERTIES AND TEMPERATURE SENSITIVITY STUDY
- Acta Polymerica Sinica Issue 1, Pages: 7-12(2003)
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- Published：20 February 2003，
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LI Bin, CHEN Wenguang, WANG Xiaogong, ZHOU Qixiang. PNIPAAm-GRAFTED LAYERS ON POLYPROPYLENE FILMS Ⅱ. SURFACE PROPERTIES AND TEMPERATURE SENSITIVITY STUDY. [J]. Acta Polymerica Sinica (1):7-12(2003)
DOI：

LI Bin, CHEN Wenguang, WANG Xiaogong, ZHOU Qixiang. PNIPAAm-GRAFTED LAYERS ON POLYPROPYLENE FILMS Ⅱ. SURFACE PROPERTIES AND TEMPERATURE SENSITIVITY STUDY. [J]. Acta Polymerica Sinica (1):7-12(2003) DOI：

摘要

通过吸水率和接触角测定研究了聚N-异丙基丙烯酰胺 (PNIPAAm)接枝膜的温度敏感特性 .尽管非交联型接枝膜和交联型接枝膜的吸水特性没有显著差别

但是交联组分的引入确实在一定程度上延缓了接枝膜的失水趋势

同时也有利于接枝膜亲水性的提高 .对接枝膜进行接触角研究发现

在某临界温度以下

接触角随时间的变化表征了探测水滴与膜表面之间的相互作用过程 .为了消除接触角测定过程中水份蒸发造成的影响

建立了接触角修正算法和修正经验关系式

并发展了一种适合于温度敏感性接枝膜LCST测定的变温实时接触角测定方法 .提出了接枝膜与水滴相互作用过程分为两个阶段的模型

并得到交联型PP接枝膜表面性能发生明显变化的临界接枝率为 0.6mg/cm2左右.

Abstract

The temperature sensitivity of poly(N-isopropyl acrylamide)(PNIPAAm)-grafted films was investigated through water absorbency and water contact angle measurements．Though it contributed little to the water absorbency of grafted films

the introduction of MBAAm retarded water evaporation from the grafted layers and also enhanced their hydrophilicity. It was found that below a certain critical temperature

the surface contact angle of the grafted films decreased during the measurement

which was related with the interaction process between the probing water drops and the film surfaces．A Temperature-dependent Real Time Contact Angle Measurement method (TRTCA)

which is especially suitable for the LCST determination of temperature-sensitive grafted films

was developed based on a newly proposed contact angle modification algorithm to eliminate the influence of water evaporation．Finally

a two-stage model was proposed to describe the interaction process between the grafted films and water．Corresponding to this model

the critical grafting yield for grafted films crosslinked with MBAAm showing significant change of surface behavior was found to be around 0.6 mg／cm2．

关键词

PNIPAAm接枝膜温度敏感性吸水率变温实时接触角测定LCST

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