Effects of crystallization behavior on morphological change in poly(trimethylene terephthalate) spherulites
Effects of crystallization behavior on morphological change in poly(trimethylene terephthalate) spherulites
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DOI：
10.1016/j.polymer.2004.01.048
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发表时间：
2004-03-29
期刊：
影响因子：
4.6
通讯作者：
Chuah, HH
中科院分区：
文献类型：
--
作者：
Chuang, WT;Hong, PD;Chuah, HH
在聚对苯二甲酸丙二醇酯(PTT)球晶等温结晶过程中，通过遵循层状生长行为，研究了随着温度降低，其形态从轴状/或椭圆带状球晶变为带状球晶，然后变为非带状球晶。我们报告了不同结晶温度下的层状生长机制，明确地探讨了图案发展中微观结构和宏观形态之间的关系。在轴晶石和带状球晶的凸带表面上观察到边缘片晶的纤维化。在非带状球晶和带状球晶的凹带表面上观察到梯田状片晶。在薄膜结晶中，PTT带状球晶呈现出边缘和平面片晶交替的纹理、波状表面和有节奏的生长。生长速率的减速发生在凸带中，具有新兴脊表面的边缘片晶纤维化的生长习惯。另一方面，生长速度加快出现在凹带中，新兴谷面具有梯田状片层的生长习性。片层的交替生长机制被认为与远离平衡的时空自组织模式的形成有关。为了解释片晶的节律性生长和周期性生长，我们可以推测薄膜结晶中PTT带状球晶的出现与潜热扩散驱动的球晶生长前沿的振荡动力学有关。我们对带到非带（BNB）形态转变的可能性提出了一些尝试性的想法，这可能类似于非平衡相变中的二阶转变。 (C) 2004 Elsevier Ltd. 保留所有权利。
In poly(trimethylene terephthalate) (PTT) spherulites during isothermal crystallization, the morphological changed from an axialite/or elliptical banded spherulite to banded spherulite and then non-banded spherulite with temperature decreasing were studied by following the lamellar growth behaviors. We report lamellar growth mechanism on varied crystallization temperature, which explicitly probes the I ink between microscopic structure and macroscopic morphology in the development of patterns. Fibrillation of the edge-on lamellae was observed on the surfaces of axialite and the convex bands of banded spherulite. Terrace-like lamellae were observed on the surface of the non-banded spherulite and the concave bands of banded-spherulite. In thin film crystallization, PTT banded spherulite exhibits a texture of alternate edge-on and flat-on lamellae, wavy-like surface and rhythmic growth. The deceleration of growth rate takes place in convex bands with a growth habit of fibrillation of the edge-on lamellae for emerging ridge surface. On the other hand, the acceleration of growth rate appears in concave bands with a growth habit of terrace-like lamellae for emerging valley surface. The alternating growth mechanism of the lamellae was considered to be related with the formation of spatiotemporal self-organization patterns far from equilibrium. In order to explain the rhythmic growth and periodic growth of the lamellae, we may conjecture that the emergence of PTT banded spherulite in thin film crystallization is associated with an oscillatory dynamics of the spherulite growth front driven by latent heat diffusion. We present some tentative ideas on the possibility of band-to-nonband (BNB) morphological transition, which might be analogous with the second order transition in non-equilibrium phase transition. (C) 2004 Elsevier Ltd. All rights reserved.