Accession Number : ADA182623

Title :   Aromatic Polyester-Polysiloxane Block Copolymers: Multiphase Transparent Damping Materials.

Descriptive Note : Final rept. 1 May 84-30 Apr 85,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF CHEMISTRY

Personal Author(s) : McGrath,James E

PDF Url : ADA182623

Report Date : 02 Oct 1986

Pagination or Media Count : 341

Abstract : This research describes the synthesis and characterization of multiphase, transparent block copolymers that are potential candidates for passive damping applications in large space structures. Relatively high molecular weight polysiloxane-polyarylester block copolymers were prepared by two different synthetic routes. A solution technique was used to synthesize well-defined, perfectly alternating block copolymers by reacting a disfunctional hydroxyl-terminated polyarylester obligomer. A second approach involved the preparation of a segmented (or random) block copolymer by an interfacial, phase-transfer technique in which various polyarylester block lengths are formed during the copolymerization by reacting bisphenol-A, terephthaloyl chloride, and isophthaloyl chloride with a disfunctiinal aminopropyl-terminated siloxane block compositions (Dimethyl,

Descriptors :   *BLOCK COPOLYMERS, *DAMPING, *SILOXANES, *POLYESTER PLASTICS, *VIBRATION ISOLATORS, MATERIALS, PHASE, TRANSPARENCE, SYNTHESIS, COPOLYMERIZATION, SOLUTIONS(GENERAL), SPACE ENVIRONMENTS, SPACECRAFT, OXIDATION RESISTANCE

Subject Categories : Plastics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE