Transport Properties and Mechanical Behavior of Poly(Methyl-Phenylsiloxane) Membranes as a Function of Methyl to Phenyl Groups Ratio

E. ERDMANN; H. A. DESTE´FANIS; ABALOS; P. M. FRONTINI,; G. A. ABRAHAM

JOURNAL OF APPLIED POLYMER SCIENCE

JOHN WILEY & SONS INC

Lugar: New York; Año: 2002 p. 1624 - 1633

0021-8995

Membranes based on dimethyl and methyl-phenylsiloxane were synthesizedand then fully characterized. Transport properties and mechanical behaviorwere determined as a function of different methyl/phenyl group ratios and the effects ofthese groups on results were established. Membrane transport properties were evaluatedfrom n-hexane absorption studies. Static tensile stress?strain deformation measurements,stress?hysteresis determination, and stress?relaxation studies were performedto assess the mechanical behavior of these membranes. The results indicatethat both physical?mechanical and transport properties are strongly affected by themethyl group content. The increase of the phenyl groups in the polymer chain impairsmechanical properties as a result of which decrease in crosslinking degree and gaspermeability due to the diminution in free volume and penetrant solubility