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[ÇóÖú] fast physical and mechanical property development·­Òë

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chen.1fan

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technical manager

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Expertise in the formula/process of silicone rubber including LSR,HCR,RTVandGel
2Â¥2012-03-28 20:30:49
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weizibo

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3Â¥2012-03-28 21:40:12
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angel-dx

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2Â¥: Originally posted by chen.1fan at 2012-03-28 20:30:49:
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fast physical and mechanical properties developmentÕâÊÇÒ»¸öС±êÌ⣬ÏÂÃæµÄÄÚÈÝΪ£ºCondensation polymers such as epoxy resins develop physical and mechanical properties slowly at low degree of polymerization and require a high degree of convesation to achieve good properties.Thus, the difference in degree of conversation by a few percent near the end of polymerization exhibits far more significant changes in mechanical properties than 10-20% increase in conversation aroud 50% degree of conversation. This is cintrast to addition polymerization where fast build-up of melecular weight at an early stage of polymerization is observed. Polybenzoxazine develop their glass transition temperature and other mechanical properties quickly as the polymerization proceeds. For BA-a benzoxazine, 80% of the Tg development  takes place at 50% conversation.
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4Â¥2012-03-29 08:51:55
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