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Investigation of polysiloxanes containing phenylethynyl groups as cross‐linkers of heat‐curable silicone rubber
Author(s) -
Xu Caihong,
Feng Shengyu
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(20000606)76:10<1554::aid-app9>3.0.co;2-m
Subject(s) - curing (chemistry) , materials science , composite material , ultimate tensile strength , silicone rubber , shore durometer , tear resistance , natural rubber , silicone , vulcanization , modulus , polydimethylsiloxane , polymer chemistry
Hydrosilation‐curing vulcanizates (HCV) and peroxide‐curing vulcanizates (PCV) were prepared respectively by using polysiloxanes containing phenylethynyl groups (PE‐PDMS) as cross‐linkers. The mechanical properties and average molecular weights of effective units (M̄ c ) of HCV and PCV were measured. The experimental results show that PE‐PDMS can be used as cross‐linkers of heat‐curable silicone rubber instead of C gum, and when adding suitable amounts of PE‐PDMS, the vulcanizates exhibited good mechanical properties. The tear strength of some vulcanizates reached 30.0 kN/m, the tensile strength 11.7 MPa, the modulus at 100% extension 3.3 MPa, and the permanent deformation is low. PE‐PDMS also has cure retardation to hydrosilation‐cure silicone rubber and thus can prolong the shelf time of stocks. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 1554–1557, 2000