0% Complete
صفحه اصلی
/
بیست و نهمین کنفرانس شیمی آلی ایران
Ring-opening Polymerization of Tetrahydrofuran
نویسندگان :
Reza Zamani Chehre Nia ( دانشگاه جامع امام حسین (ع) ) , Alireza Banan ( دانشگاه جامع امام حسین (ع) )
کلید واژه ها :
Ring-opening Polymerization،Tetrahydrofuran،Poly(tetramethylene ether glycol)،heteropolyacid (H3PW12O40)،acetic anhydride،PTMG
چکیده مقاله :
The ring-opening polymerization is a useful method to prepare polymers and copolymers with controlled microstructure, chain length and functionality that are otherwise difficult to obtain by conventional polymerization methods.1,2 This method is usually used for the production of high performance polymeric materials and engineering plastics. Poly(tetramethylene ether glycol) (PTMG), also called poly(tetrahydrofuran), is a colorless waxy polymer that is widely used as a soft segment for the production of thermoplastic elastomers and as an intermediate for the synthesis of elastic fibers, polyurethanes, and polyesters.3,4 Due to its unique physical and chemical properties and its use in advanced applications, it is very demanding to design efficient methods for the synthesis of PTMG. In this study a catalytic prodecure has been developed for the synthesis of PTMG by ring opening polymerization of THF.Herein,a heteropolyacid (H3PW12O40) and acetic anhydride as a co-catalyst are used to control the molecular weight of the resulting polymer. The heteropolyacid has high acid strength and forms stable polyanions and in combination with acetic anhydride can activate THF ring. The activated THF rings are opened and polymerized to form the acetate-terminated polymer. Polymerization was terminated and the acetate end-groups are hydrolyzed with the addition of NaOH aqueous solution.
لیست مقالات این رویداد
ثمین همایش، سامانه مدیریت کنفرانس ها و جشنواره ها
