Orientation of boron nitride nanosheets in CM/EPDM Co-continuous blends and their thermal conductive properties. (August 2018)

• Record Type: Journal Article
• Authors: Cao, Ming; Shu, Junjie; Chen, Peng; Xia, Ru; Yang, Bin; Miao, Jibin; Qian, Jiasheng
• Is Part Of: Polymer testing. Volume 69(2018)
• Page Start: 208
• Page End: 213
• Publication Date: 2018-08
• Subjects: Co-continuous blends -- Orientated BNNSs -- Thermal conductivity -- Heat build-up; Polymers -- Testing -- Periodicals; Polymères -- Tests -- Périodiques; 620.1920287
• DOI: 10.1016/j.polymertesting.2018.05.028
• Languages: English
• ISSNs: 0142-9418

Abstract

Abstract: The co-continuous blends of chlorinated polyethylene rubber (CM) and ethylene propylene diene rubber (EPDM) were prepared. Boron nitride nanosheets (BNNSs) were filled into the blends and orientated by shearing on a two-roll mill. The microstructure of CM/EPDM blends and the localization of BNNSs were observed by scanning electron microscopy (SEM). The effects of orientation and content of BNNSs based fillers on thermal conductivity and mechanical properties of the composites were investigated. It was found that a co-continuous blend was obtained at the CM/EPDM mass ratio of 1/1, in which the co-continuous structure of the composites and orientation of BNNSS were helpful to improve the thermal conductivity. The CM/EPDM/BNNSs composites had thermal conductivity of 1.65 W/(m·K) (30 wt% BNNSs) and flexibility with elongation at break of 405%. The selective localization in the CM/EPDM co-continuous blends could decrease the percolation threshold to 17wt%. In addition, CM/EPDM/BNNSs composites can reduce the heat build-up during repeated compressing-relaxing compared to CM/BNNSs composites. Highlights: The co-continuous blends of CM and EPDM were prepared. Different contents of BNNSs were filled into the blends and orientated by an open mill. The orientated BNNSs could improve thermal conductivity and mechanical properties of the resultant composites. The selective localization in the blends could decrease the percolation threshold (17wt%). CM/EPDM/BNNSs composites can reduce the heat build-up during repeated compressing-relaxing compared to CM/BNNSs composites.