Chen Yu-Fan, Woo Eamor M
Department of Chemical Engineering, National Cheng Kung University, Tainan 701-01, Taiwan.
Macromol Rapid Commun. 2009 Nov 19;30(22):1911-6. doi: 10.1002/marc.200900292. Epub 2009 Aug 13.
Morphology of crystallized spherulites in poly(nonamethylene terephthalate) (PNT) in bulk forms, instead of thin-film forms, was investigated using scanning electron microscopy (SEM), polarized-optical microscopy (POM), and transmission electron microscopy (TEM). Ring textures were found to exist on the fractured surfaces or microtomed films from bulk PNT samples. By further SEM and TEM examinations, the fracture surfaces and microtomed films from the interior of the bulk display similar ring-banded patterns as those in thin films cast on glass slides. Although the cast PNT thin films in two-dimensional growth are known to display both Type-1 ring bands as majority and Type-2 ring bands as minority, this study further shows that the interior of PNT bulk exhibits mainly Type-1 (single rings with narrower spacing than Type-2) ring bands, and Type-2 spherulites exist sporadically in three-dimensional forms. From these analyses on the ring bands in the interiors of bulk-form PNT crystallized at several specific temperatures, it can be proposed that the growth of spherulites in three dimensions is layer-by-layer, packing into a multi-shells structure in three-dimensional ring-banded spheres.
采用扫描电子显微镜（SEM）、偏光显微镜（POM）和透射电子显微镜（TEM）研究了本体形式而非薄膜形式的聚对苯二甲酸壬二醇酯（PNT）中结晶球晶的形态。发现从本体PNT样品的断裂表面或切片薄膜上存在环状纹理。通过进一步的SEM和TEM检查，本体内部的断裂表面和切片薄膜显示出与浇铸在载玻片上的薄膜类似的环状条纹图案。虽然已知二维生长的浇铸PNT薄膜主要显示为多数的1型环带和少数的2型环带，但本研究进一步表明，PNT本体内部主要呈现1型（间距比2型窄的单环）环带，2型球晶以三维形式零星存在。通过对在几个特定温度下结晶的本体PNT内部环带的这些分析，可以提出球晶在三维空间中的生长是逐层进行的，堆积成三维环状球体的多壳结构。
