Preparations and Characterizations of PDMS/PEO-Grafted Polyamide and Poly(amide-imide)

Abstract

Polydimethylsiloxane and poly(ethylene oxide) randomly grafted polyamide (PA-g-SE) and poly(amide-imide) (PAI-g-SE) were prepared by a macromonomer method, and the effect of the backbone structure on the thermal property and the solubility of the graft copolymers was investigated. Glass transition temperature (Tg) of PAI-g-SE was observed in the range of 160 -170°C, whereas Tg of PA-g-SE was not observed in the range of 0 -300°C. The obtained PAI-g-SE was soluble in some solvents such as DMSO, DMF, THF and chloroform, whereas PA-g-SE was soluble only in NMP just after precipitation when it was swollen in methanol. In addition, the solubility of PAI-g-SE was depended on the components, where the affinity of polymer against THF and chloroform increased with the increase of PDMS content in the polymer.

Syntheses of PEO Graft Copolyamides and the Permselectivity of CO₂

“…The synthetic procedures of 3,5-bis(4-nitrophenyloxy)benzoic acid (BNPB), 3,5-bis(4-aminophenoxy)phenylcarbonyloxy-terminated PEO macromonomer (BAPP-PEO) and 3,5-bis(4-aminophenoxy)benzyloxy-terminated PDMS macromonomer (BAPB-PDMS) were described in our previous papers [10][11][12]. Poly(ethylene oxide) (Mw = 600) was kindly supplied from Nichiyu Co. Ltd, and it was dehydrated by heating over 130 °C in vacuo for 10 h…”