Department of Chemical Engineering, National Cheng Kung University, Tainan, 701-01, Taiwan.
Phys Chem Chem Phys. 2011 Oct 21;13(39):17841-51. doi: 10.1039/c1cp22249j. Epub 2011 Sep 12.
Top-surface and three-dimensional views of Type-1 and Type-2 of ring-banded spherulites in poly(nonamethylene terephthalate) (PNT) in thicker bulk crystallized on a nucleating potassium bromide (KBr) substrate were examined using various microscopy techniques: scanning electron microscopy (SEM), polarized-optical microscopy (POM), and atomic-force microscopy (AFM). In PNT crystallized at higher crystallization temperature (T(c)) with heterogeneous nucleating substrate, typically two types of ring-banded spherulites are present that differ significantly in patterns and ring spacings: Type-1 Type-2 (single- and double-ring-banded spherulites). Three-dimensional view on fractured spherulites in bulk PNT samples reveals that the single-ring-banded spherulite (Type-1) tends to be well-rounded spheres as they are nucleated homogeneously from bulk; the double-ring-banded spherulite (Type-2) is concentric hemisphere or truncated sphere shells owing to be nucleated from bottom. With confined thickness of films, the 3-D hemispheres in PNT may become truncated into multi-shell annular cones or arcs when thickness or growth is restricted. Based on the top-surface vs. interior views of banded lamellar assembly, origins and inner structures of dual types of ring bands in PNT were examined in greater details.
在具有成核剂溴化钾（KBr）的基底上，对较厚块状结晶的聚对苯二甲酸壬二酯（PNT）中 1 型和 2 型环带球晶的顶表面和三维视图进行了各种显微镜技术的研究：扫描电子显微镜（SEM）、偏光显微镜（POM）和原子力显微镜（AFM）。在具有异质成核基底的较高结晶温度（T(c)）下结晶的 PNT 中，通常存在两种类型的环带球晶，它们在图案和环间距上有很大的不同：1 型和 2 型（单环带和双环带球晶）。在大块 PNT 样品的断裂球晶的三维视图中，发现单环带球晶（1 型）往往是球形的，因为它们是从大块中均匀成核的；双环带球晶（2 型）是同心半球或截头球壳，因为它们是从底部成核的。在薄膜的受限厚度下，当厚度或生长受到限制时，PNT 中的 3-D 半球可能会被截断成多壳环形锥或弧形。基于带层组装的顶表面与内部视图，更详细地研究了 PNT 中双类型环带的起源和内部结构。
