熱塑性彈性體之破壞行為

The Fracture Behavior Of Thermoplastic Elastomers

張志夷(chih-i chang)

指導教授 ： 王紀

元智大學/工程學院/化學工程與材料科學學系/碩士(1995年)

摘要

無資料

關鍵字

撕裂測試 ； 破壞能量 ； 交聯之聚苯烯-聚丁二烯 ； 切割測試 ； 熱塑性彈性體

並列摘要

Previous studies have show that SBS triblock copolymers possess
relativelyhigh tear strength ,about 10 KJ/m^2 at room
temperature. However,thestrength is eventually zero when test
temperature is higher than the glasstransition temperature of PS
phase,centigrade degree of 95. Thus,the objective of thus
research is to improve the strength of SBS copolymers at high
temperature, e.g.centigrade degree of 100. Chemical
crosslinkingof the PB phase is carried out by introducing small
amouts of dicumylperoxide(DCP). A conventional tear test and a
newly developed cutting test are performed to determine the
fracture energy of the DCP cured SBSspecimens. It''s been found
that 0.01 phr cured SBS specimens still possess comparable tear
strength ,when compared with neat SBS samples. Moreover,
thetear strength at high temperature has been effectively
enhanced to be about 100 KJ/m^2. However,specimens with higher
content of DCP show a reducedtear strength at room temperature.
Tear strength of 1 phr cured SBSspecimens is about one-tenth of
the neat SBS ones. Domain morpology of thecured SBS specimens
is investigated with a transmission electron microscopy.
Mechanical properties of the cured SBS are determined with a
tensile testing machine. Young''s modulus,breaking stress and
energy density at break arededuced from the stress-strain
curves. Similar approaches are used to investigate the effects
of rate and temperature on the fracture energy of a blend of
EPDM rubber and PP plastics(santoprene). Results show that
santoprene has a strength of 10 KJ/m^2 atroom temperature.
Furthermore,the strength at centigrade degree of 150 is
notgreatly reduced, about 1 KJ/m^2,although some crystals start
to melt. DSC measurements show a melting peaking at a
temperature of centigrade degree of 158.5.

並列關鍵字

tear test ； fracture energy ； cured SBS ； cutting test ； thermoplastic elastomres