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Poly(styrene)‐ and Poly(styrene‐ co ‐methyl methacrylate)‐ graft ‐hydrogenated natural rubber latex: Aspect on synthesis, properties, and compatibility
Author(s) -
Sakorn Siriporn,
Rempel Garry L.,
Prasassarakich Pattarapan,
Hinchiranan Napida
Publication year - 2016
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.21412
Subject(s) - materials science , natural rubber , monomer , styrene , copolymer , methyl methacrylate , grafting , acrylonitrile , polymer chemistry , compatibilization , thermogravimetric analysis , composite material , chemical engineering , polymer , polymer blend , engineering
The undesirable properties of natural rubber (NR) can be improved via hydrogenation and graft copolymerization. Hydrogenated NR (HNR) latex was prepared via diimide reduction and then grafted with styrene (ST) or ST/methyl methacrylate (MMA) to form poly(ST)‐ graft ‐HNR (poly(ST)‐ g ‐HNR, GHNRS) or poly(ST‐ co ‐MMA)‐ g ‐HNR (GHNRSM), respectively. For the grafting of ST monomer onto HNR particles, the %monomer conversion and %grafting efficiency (%GE) were monitored as functions of %hydrogenation, monomer and initiator concentrations, temperature, and time. Under the optimum condition (HNR with 54.3% hydrogenation; 100 phr of ST, 1 phr of initiator at 50°C for 8 h), maximum %conversion and %GE of 44.6% and 36.9%, respectively, were achieved. Thermogravimetric analysis revealed that the HNR grafted with ST or ST/MMA had higher decomposition temperature than an ungrafted one. When these graft products were blended at 10% (w/w) with acrylonitrile‐butadiene‐styrene (ABS) resin, the GHNRS/ABS and GHNRSM/ABS composites exhibited the higher flexural strength and heat aging tolerance compared to the ungrafted HNR/ABS composite. Scanning electron microscopy (SEM) also showed the higher degree of homogeneity at the fractural surface, supporting the higher compatibility between the ABS and the GHNRS or GHNRSM phases in the blends. J. VINYL ADDIT. TECHNOL., 22:100–109, 2016. © 2014 Society of Plastics Engineers