X-Ray and Infrared Investigation of the Supramolecular Structure of PVC

✍ Scribed by Biais, RéGine ;Geny, Chuong ;Mordini, Claude ;Carrega, Marc

• Book ID: 104527104
• Publisher: Wiley (John Wiley & Sons)
• Year: 2007
• Tongue: English
• Weight: 630 KB
• Volume: 12
• Category: Article
• ISSN: 0007-1641
• DOI: 10.1002/pi.4980120409

✦ Synopsis

Abstract

Two types of crystalline morphology seem to be present in commercial PVC powder, both related to syndiotactic sequences in Natta orthorhombic cell: (1) ribbon‐like crystats formed during the second stage of the mass‐process and in suspension or by annealing PVC samples above T~g~. (2) high melting fringed‐micelles are the main crystalline feature of emulsion type powder and of low‐conversion mass PVC.

A second less ordered phase, which does not fit the Natta cell is found also in emulsion powder and in highly strained samples (like fibres).

Ribbon‐like crystals and fringed‐micelles influence the i.r. absorption at 604 and 638 cm^−1^ respectively. 685cm^−1^ might be related to the low‐order phase, the X‐ray spacing of which is 3.8‐‐4.0 Å along the chain.