Structural analysis of oriented poly(ε-caprolactone) including CaCO3 particles with 13C solid-state NMR

✍ Scribed by Takuro Ito; Yuji Yamaguchi; Hiroto Watanabe; Tetuso Asakura

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 202 KB
• Volume: 80
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1344

✦ Synopsis

Abstract

The results of a study of the relation between the oriented structure and drawn Poly(ε‐caprolactone) specimens including CaCO~3~ particles and their dynamic mechanical properties are presented. The loss elasticity, E″, showed almost the same curve for both undrawn sheets and drawn sheets as a function of CaCO~3~ content. On the other hand, the storage modulus, E′, of drawn sheets increased nonlinearly with increasing CaCO~3~ content, and their curve showed lower E′ values than those of undrawn sheets. By simulation of ^13^C CP NMR spectra of drawn PCL/CaCO~3~ sheets, both oriented and unoriented components were observed. The distribution parameter, p, of drawn PCL/CaCO~3~ sheets was 13°, which was larger than those (8°) of drawn PCL. Further, the fraction of the unoriented component increased with increasing CaCO~3~ content. Thus, adding CaCO~3~ particles into the PCL, the arrangement of the oriented component was disturbed and decreased. In addition, from the line shape analyses of ^13^C CP MAS NMR spectra, four peaks were obtained in not only undrawn sheets but also in drawn sheets of both PCL and PCL/CaCO~3~ compounds. Besides, structural change occurred at only drawn PCL/CaCO~3~ sheets. Therefore, the change in dynamic mechanical properties observed only for drawn PCL/CaCO~3~ sheets were strongly dependent on the orientational structure, which was formed under shear stress of the stretching drawn process. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 2376–2382, 2001