Production & Quality
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COC Glass Transition Temperature Tg
Problem Phenomenon
COC has a high glass transition temperature of 140-170℃, a heat resistance advantage, and processing temperature management.
Cause Analysis
The rigid ring structure of the COC main chain is extremely rigid; it presents a relatively high glass transition temperature; Tg rises with increasing cyclic olefin monomer insertion rate; in the range of 140-170℃; its heat resistance is better than PC.
Solution
①Utilize the high Tg heat resistance advantage; ②processing temperature matching; ③Tg grade selection; ④thermal management; ⑤performance verification.; After adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
COC's high Tg is a heat resistance advantage; processing temperature matching is the key; verification ensures performance.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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