폴리(m-메틸렌 2,6-나프탈레이트)들의 고분자쌍 블렌드에 대한 상용성 지도

Binary blends of poly(m-methylene 2,6-naphthalate) (PmN, m=2-8) were prepared by the solution-blendingmethod and their miscibility was investigated with glass transition, crystallization, and melting behaviors, which wereobtained from differential scanning calorimetry. It was determined that all the blends in which the difference in thenumber of methylene units between two component polymers was one were miscible. The blends in which the differencein the number of methylene units was two show divergent miscibility: two miscible, two partially miscible, andone immiscible systems. Among the blends in which the difference in the number of methylene units was three, twosystems were partially miscible and the other two were immiscible. All the blends in which the difference in the numberof methylene units was four or more were immiscible. It was thus found that the difference in the number of methyleneunits between two component polymers in the blend is the primary structural factor affecting the miscibility of abinary blend of PmN. The border between miscible blends and immiscible ones was found to be at differences in methylene-unit numbers of two or three.