期刊
POLYMER
卷 134, 期 -, 页码 263-274出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2017.11.053
关键词
In situ fibrillated composites; Rheology; Microcellular injection foaming
资金
- Wisconsin Institute for Discovery (WID)
- Kuo K. and Cindy F. Wang Professorship
- Vilas Distinguished Achievement Professorship
- China Scholarship Council
- National Natural Science Foundation of China [51573063, 21174044]
- Guangdong Nature Science Foundation [S2013020013855]
- Guangdong Science and Technology Planning Project [2014B010104004, 2013B090600126]
- Guangzhou Science and Technology Planning Project [201604010013]
- National Basic Research Development Program 973 in China [2012CB025902]
An approach to produce in situ fibrillated polytetrafluoroethylene (PTFE) in thermoplastic polyurethane (TPU) has been developed and the effect on the rheological behavior, mechanical properties, and microcellular foamability of TPU/PTFE composites has been studied. A drastic transformation of oval or rounded PTFE particles into highly stretched, sub-micron fibrils in the TPU matrix via melt compounding was revealed by scanning electron microscopy (SEM) images. Dynamic mechanical analysis (DMA) and tensile tests showed substantial improvements in the measured properties of the TPU/PTFE composites. The oscillatory shear behavior of the TPU/PTFE composites in the linear viscoelastic region was studied. Dynamic frequency sweep experiments revealed that the storage modulus (G') increased and the slope of G' vs. frequency decreased at low frequencies compared to neat TPU. This indicated that the entangled fibril structure responded elastically. Microcellular injection foaming (MIF) trials, SEM, and micro-computed tomography (Micro-CT) confirmed that the presence of PTFE fibrils dramatically improved the foamed structure, resulting in a two-order-increase in pore density (cell density) in comparison with neat TPU. Moreover, the fibrillar PTFE dramatically enhanced the hydrophobicity and decreased the coefficient of friction of the TPU/PTFE composites. (C) 2017 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据