TEM Observation of Natural Rubber Thin Films Crystallized under Molecular Orientation

Author:

Shimizu Toshiki1,Tosaka Masatoshi2,Tsuji Masaki2,Kohjiya Shinzo2

Affiliation:

1. 1Research & Development Center, Toyo Tire & Rubber Co., LTD., 5-7 Nishichujo, Ibaraki, Osaka-Fu, 567-0887, Japan

2. 2Laboratory of Polymer Condensed States, Institute for Chemical Research, Kyoto University, Uji, Kyoto-Fu 611-0011, Japan; e-mail: tsujimas@scl.kyoto-u.ac.jp

Abstract

Abstract Morphology of natural rubber (NR) thin films crystallized under molecular orientation was examined by transmission electron microscopy (TEM). A thin film of NR (RSS#1) was made by casting its n-hexane (or benzene) solution onto the water surface, and prestretched up to a desired amount of strain (%). Each of the specimens thus prepared was introduced into a TEM column and isothermally crystallized at −25 °C with a cryo-transfer specimen-holder. Morphological observations in bright- and dark-field imaging modes revealed directly that the length of the lamellae, which were oriented perpendicular to the stretching direction, decreased with increasing strain. The result seems to be related to the population density of “γ-filaments” (named by Andrews) generated only by prestretching. Time-resolved bright-field observations by in situ TEM of the thin film prestretched up to a strain of 200% revealed the following. Though the film gave crystalline reflections in its selected-area electron diffraction even before isothermal crystallization, no well-defined lamellae were recognized. Subsequent isothermal crystallization for 2 h, however, formed well-defined lamellae oriented perpendicular to the stretching direction. This observation, conceivably, suggests that “γ-filaments” were formed immediately by prestretching and then the lamellae were nucleated on the γ-filaments at −25 °C.

Publisher

Rubber Division, ACS

Subject

Materials Chemistry,Polymers and Plastics

Cited by 29 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Self-Reinforcement in Natural Rubber (NR): Template Crystallization;Reinforcement of Rubber;2020

2. A physically-based model for strain-induced crystallization in natural rubber. Part I: Life cycle of a crystallite;Journal of the Mechanics and Physics of Solids;2019-04

3. Triaxially oriented shape memory natural rubber;Polymer;2018-11

4. An affine microsphere approach to modeling strain-induced crystallization in rubbery polymers;Continuum Mechanics and Thermodynamics;2018-01-13

5. Introduction;In-situ Structure Characterization of Elastomers during Deformation and Fracture;2014

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3