Polarized optical microscopy and phase - contrast microscopy were used to observe the banded spherulites of poly ( e - caprolactone ) / poly ( vinyl chloride ) ( pcl / pvc ) blends . the ring spacing and regularity of the banded spherulites decreased with the decrease of the crystallizing temperature 本文利用偏光显微镜和相差显微镜观察了聚-己内酯聚氯乙烯形成的环带球晶，环带间距随温度的降低而减小，规整性亦随之下降。
