NMR studies of the structural development of high‐speed melt‐spun poly (ethylene terephthalate) fibers

D. L. Tzou, P. Desai, A. S. Abhiraman, T. ‐H Huang*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

16 引文 斯高帕斯(Scopus)

摘要

Lineshape simulation of 13C nuclear magnetic resonances was employed to characterize the structural development of poly (ethylene terephthalate) (PET) during fiber formation and subsequent processing. In all spectra the carbonyl (CA) and glycoethylene (GE) resonances can be simulated with two components. The intensity variation of these components has been interpreted quantitatively on the basis of four morphological components in the solid‐state structure, with clearly defined differences in order between them. The four components are, in decreasing structural order, (i) crystalline (C), (ii) noncrystalline with order in both CA and GE environments (NC1), (iii) noncrystalline with order only in the GE environment (NC2), and (iv) amorphous (NCA). The crystalline component has been taken here to correspond to the high‐density component which has been estimated from flotation and optical density measurements. Such an analysis reveals a smooth pattern of evolution of order within a range of conditions in melt spinning and subsequent thermomechanical processing of PET fibers. Cold drawing at room temperature was seen to induce substantial ordering only in the GE environment. In contrast, annealing at a temperature significantly above glass transition temperature (Tg) for 2 h appears to cause the conversion of amorphous component to crystalline from with little accumulation of the intermediate components.

原文英語
頁(從 - 到)49-56
頁數8
期刊Journal of Polymer Science Part B: Polymer Physics
29
發行號1
DOIs
出版狀態已發佈 - 1991 一月

ASJC Scopus subject areas

  • 凝聚態物理學
  • 物理與理論化學
  • 聚合物和塑料
  • 材料化學

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