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Crosslink Density of Peroxide Cured TPV
Author(s) -
Vennemann Norbert,
Bökamp Klaus,
Bröker Dirk
Publication year - 2006
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200651391
Subject(s) - compression set , materials science , vulcanization , composite material , swelling , organic peroxide , ultimate tensile strength , thermoplastic , phase (matter) , peroxide , elongation , elastomer , relaxation (psychology) , tensile testing , stress relaxation , methacrylate , natural rubber , copolymer , polymer , creep , chemistry , organic chemistry , psychology , social psychology
EPDM/PP model compounds were dynamically vulcanized by use of varying amounts of an organic peroxide and a trifunctional methacrylate to produce thermoplastic vulcanizates (TPV) materials with different properties. Tensile strength and ultimate elongation as well as compression set data of these materials are comparable to existing commercial TPV products. Although, crosslinking of the elastomer phase is the most important step during the production process, there is a lack of suitable test methods until now to determine the cross link density precisely. Therefore, a new test method, Temperature Scanning Stress Relaxation (TSSR) was examined to determine the crosslink density of the EPDM – phase. The results are in good agreement with results obtained from conventional swell measurements. The advantages of TSSR measurements over swell measurements are quite obvious. Whereas swelling measurements are very time consuming, TSSR tests are much easier and faster to perform. Additionally, information about the relaxation behavior and degradation of the PP ‐ phase was obtained from TSSR measurements.