Mechanical and morphological properties of cellular NR/SBR vulcanizates under thermal and weathering ageing

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

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รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Wimolmala E., Khongnual K., Sombatsompop N.

ผู้เผยแพร่: Wiley

ปีที่เผยแพร่ (ค.ศ.): 2009

วารสาร: Journal of Applied Polymer Science (0021-8995)

Volume number: 114

Issue number: 5

หน้าแรก: 2816

หน้าสุดท้าย: 2827

จำนวนหน้า: 12

นอก: 0021-8995

eISSN: 1097-4628

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-70249096339&doi=10.1002%2fapp.30763&partnerID=40&md5=de0c4ac323d046e186d77b6846254a94

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

The effects of addition of two chemical blowing agents in cellular rubber blend of natural rubber (NR) and styrene-butadiene rubber (SBR) at a fixed blend ratio of 1 : 1 on cure characteristics, and mechanical and morphological properties were invesigated. The chemical blowing agents used in this work were Oxybis (benzene sulfonyl) hydrazide (OBSH) and Azo dicarbonamide (ADC). Three different fillers, fly ash (FA) particles, precipitated silica, carbon black (CB) at their optimum concentrations of 40 phr were used, the FA and silica particles being chemically treated by bis-(3-triethoxysilylpropyl) tetrasulphide. The results suggested that the overall cure time decreased with OBSH and ADC contents. The OBSH was more effective in cure-acceleration of the NR/SBR blend than the ADC. The NR/SBR vulcanized foams produced by OBSH and ADC agents had closed-cell structures. The specific density and mechanical properties of the blend tended to decrease with increasing blowing agent content. The CB gave NR/SBR foams with smaller cell size, better cell dispersion, and higher mechanical properties than the precipitated silica and FA particles. The heat ageing and weathering resulted in an increase in tensile modulus and hardness, but lowered the tensile strength, ultimate elongation and tear strength. The elastic recovery for cellular NR/SBR vulcanizates with FA was superior to that with CB and silica, the elastic recovery of the blends decreasing with blowing agent content. Resilience property was improved by the presence of gas phases. The optimum concentration of OBSH and ADC to be used for NR/SBR vulcanizates was 4 phr. ฉ 2009 Wiley Periodicals, Inc.

คำสำคัญ

Cellular rubber, Foam