Waterborne polyurethanes (PU) anionomers were obtained from poly(β-methyl-δ-valerolactone) glycol (PMVL), poly(caprolactone) glycol (PCL), poly(tetramethylene adipate) glycol (PTAd), and isophorone diisocyanate (IPDI) following a prepolymer mixing process. The soft-hard segment phase separations in response to the variations of composition and structure of PU have been studied from the dynamic mechanical measurements of the emulsion cast film. The structural variation included ionic and butanediol (BD) content, and type and length of the soft segment. It was found that phase separation was sensitive to the soft segment length. With only phase separation, the rubbery modulus was significant even with lower hard segment content. Phase separation was much greater with PU from PTAd, rather than the one from PCL and PMVL.

PMVL, PCL, PTAd 및 IPDI로부터 prepolymer 혼합법에 따라 음이온형 수성 폴리우레탄(PU)을 얻었다 이때 구조변수로서는 이온 및 BD함량, 연질상의 형태 및 길이로 하였으며 emulsion 주조 필름을 이용, PU 조성 및 구조변화에 따른 연질상-경질상간의 상분리를 연구하였다. 상분리는 연질상 길이에 매우 민감하였다. 상분리시에만 고무상 탄성율의 값이 매우 컸으며, 상분리는 PCL이나 PMVL 보다 PTAd로 된 PU가 훨씬 뚜렸하였다.

Keywords: polyurethane ionomer; PMVL; IPDI