Anomalous Mechanical Response of Stretched Film of Poly(3-Hydroxybutyrate-co-3-Hydroxyhexanoate)

IF 4.7 3区 工程技术 Q2 ENGINEERING, ENVIRONMENTAL
Yuta Fukuda, Khunanya Janchai, Takenobu Sunagawa, Masayuki Yamaguchi
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Abstract

The mechanical responses during loading, unloading, and reloading cyclic tensile tests of a tubular blown film of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) are studied. Although the stress–strain curve recorded during the initial stretching process is typical for a crystalline polymer, the stretched film behaves like a rubber during the reloading process; that is, low modulus with a small residual strain after unloading. Furthermore, the stress–strain curves during the reloading process are an inverted “S” shape. During the first stretching process of the polymer film, small crystals are destroyed without reorganization into a crystalline structure, leading to the observed decrease of crystallinity. In contrast, well-developed crystals that orient to the machine direction of the film do not disappear during the first stretching and act as crosslink points during reloading. As a result, a rubber-like response is detected. This mechanical response during reloading is considerably different from those of conventional crystalline plastics such as polyethylene and polypropylene.

Abstract Image

聚(3-羟基丁酸-3-羟基己酸)拉伸薄膜的异常机械响应
研究了聚(3-羟基丁酸-3-羟基己酸)管状吹塑薄膜在加载、卸载和再加载循环拉伸试验过程中的机械响应。虽然初始拉伸过程中记录的应力-应变曲线是典型的结晶聚合物曲线,但拉伸薄膜在重新加载过程中表现得像橡胶,即低模量,卸载后残余应变小。此外,重装过程中的应力-应变曲线呈倒 "S "形。在聚合物薄膜的第一次拉伸过程中,小晶体被破坏,没有重组为晶体结构,导致观察到的结晶度降低。与此相反,在第一次拉伸过程中,与薄膜机械方向一致的发达晶体不会消失,并在重新加载过程中起到交联点的作用。因此,可检测到类似橡胶的反应。这种重新加载时的机械响应与聚乙烯和聚丙烯等传统结晶塑料的机械响应有很大不同。
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来源期刊
Journal of Polymers and the Environment
Journal of Polymers and the Environment 工程技术-高分子科学
CiteScore
9.50
自引率
7.50%
发文量
297
审稿时长
9 months
期刊介绍: The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.
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