کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5191681 | 1381237 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Catalytic double ring-opening polyaddition of spiro orthoester with acid chloride for shrinkage-controlled molding
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In order to develop a casting resin for precision molding, a curing method without shrinkage during the polymerization was achieved by the double ring-opening addition reaction of spiro orthoester (SOE) and acid chloride using cationic catalysts. Tetraphenylphosphonium halides (TPPXs) were found to be effective catalysts for the reaction. The catalytic reaction of SOE with acid chloride proceeded even at 25 °C to give the corresponding adduct. Polyaddition of a bifunctional SOE-XII with trifunctional 1,3,5-pentanetricarbonyl trichloride gave a cured material at 30 °C in the presence of tetraphenylphosphonium bromide (TPPB) of 1 mol%, accompanied by a negligible shrinkage of 0.21%. Gelation time was shortened with increase in the amount of catalyst and reaction temperature in the curing process. The obtained products were crosslinked copolymers that showed variable mechanical properties dependent on the curing temperature and monomer structure. This is the first demonstration of shrinkage-controlled molding in the absence of heating or cooling process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 8, 29 March 2005, Pages 2531-2540
Journal: Polymer - Volume 46, Issue 8, 29 March 2005, Pages 2531-2540
نویسندگان
Haruo Nishida, Hiroshi Morikawa, Takeshi Nakahara, Takayuki Ogata, Koshi Kusumoto, Takeshi Endo,