Accession Number : ADA184405

Title :   Synthesis and Characterization of Block Copolymers.

Descriptive Note : Technical rept.,

Corporate Author : MASSACHUSETTS UNIV AMHERST DEPT OF POLYMER SCIENCE AND ENGINEERING

Personal Author(s) : Chien,James C ; Hong,Jun-Long

PDF Url : ADA184405

Report Date : 01 Jul 1987

Pagination or Media Count : 5

Abstract : Segmented (AB)n Polyurethanes; A series of polyether-polyurethane (PEPU) segmented block copolymers were synthesized and characterized. Soft segments were poly(propylene oxide) (PPO; Mn = 2,000) or poly(tetrahydrofuran) (PTHF; Mn = 1,650). Hard segments were formed from 4,4'-diphenylmethane diisocyanate (MDI) and different short chain diols as chain extenders. In the PPO series, 1-5-pentandiol (P). diethylene glycol (D), triethylene glycol (T) and 1,3-bis(N,N'-methyl-N,N'-2-hydroxyethyl)isophthalamide (Bi(M)) were used as chain extenders. In the PTHF series 1,6-bis(N,N'-2-hydroxy-ethyl)adipamide (A), Bi(M), D, T, bis(N,N'-2-hydroxyethyl)isophthalamide (Bi) and 1,6-bis(N,N'methyl-N,N'-2-hydroxy-ethyl)adipamide (A(M)) were used as chain extenders. By varying hard segment content, PEPU polymers with different properties were synthesized.

Descriptors :   *BLOCK COPOLYMERS, POLYURETHANE RESINS, POLYETHERS, SYNTHESIS(CHEMISTRY)

Subject Categories : Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE