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嵌段共聚物ＰＩ－ｂ－ＰＭＭＡ和不同羟基含量的改性聚苯乙烯ＰＳ（ＯＨ）组成的共混物因ＰＭ－ＭＡ嵌段和ＰＳ（ＯＨ）间的玻璃化转变相当接近而不能用通常的ＤＳＣ法判别其相容性。通过共混物的焓弛豫，得到相容性明确的ＤＳＣ判据，且与电镜观察结果一致。共混物中的Ｔｇ增宽效应可通过江明等提出的链密度梯度模型解释。
The blend of the block copolymer PI-b-PMMA and the modified polystyrene PS (OH) with different hydroxyl contents is quite close due to the glass transition between the PM-MA block and PS (OH) DSC method to determine its compatibility. By means of the enthalpy relaxation of the blends, a clear DSC criterion was obtained, which was consistent with the electron microscopic observation. The widening effect of Tg in blends can be explained by the chain density gradient model proposed by Jiang et al.