期刊
POLYMER TESTING
卷 29, 期 3, 页码 346-351出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2009.12.010
关键词
Thermoplastic natural rubber; Natural rubber powder; High density polyethylene; Mechanical properties; Recyclability
Preparation of thermoplastic natural rubber (TPNR) was carried out by blending high density polyethylene (HDPE) with natural rubber powder (NRP) obtained from spray drying of pre-vulcanized natural rubber latex. The blend ratio of NRP/HDPE was varied and the properties and recyclability of the TPNRs were investigated. The results reveal that, due to flow restriction of the crosslinked NRP, viscosity of the TPNR increases continuously with increasing NRP content. As expected, when NRP content is increased, properties the TPNR are more rubber-like, as clearly observed from the stress-strain curve characteristics, the reductions in modulus and hardness and, most importantly, the significant improvement of permanent set. Although phase size of the dispersed NRP is relatively large, the tensile strength tends to increase gradually with increasing NRP content. The phenomenon of strain-induced crystallization is proposed to explain the results. It is also found that recycling has a noticeably detrimental influence on most properties of the TPNRs such as tensile strength, tear strength, hardness and tension set. This is thought to be a consequence of thermal degradation of the NRP during the recycling process. (C) 2010 Elsevier Ltd. All rights reserved.
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