X-ray and mass spectral analysis of poly phenylisocyanate obtained by complex base catalyst

Date

2003-01-01

Author

Usanmaz, Ali
Cevik, NN

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The polymerization of phenylisocyanate in bulk and in solution of THF by complex base (CB), NaNH2/(CH3)(3)CONa catalyst under vacuum was previously reported. The polymer obtained was fractionated by washing and extracted with different solvents. Polymer fractions were shown to be highly crystalline by X-ray analysis. Different fractions have similar crystalline structure with some modifications in cell parameters of primitive monoclinic unit cell. Mass spectral analysis gave valuable information for the chain structure and polymerization mechanism of polyphenylisocyanate. The evolution of NH2- and NH3 at low temperature and early stage by pyrolysis showed the chain-ending with -NH2. This is an indication of initiation by NH2- in complex base catalyst. The polymer does not contain large amounts of dimer and trimer when polymerized by this catalyst.

Subject Keywords

Materials Chemistry, General Chemistry, Polymers and Plastics, Ceramics and Composites

URI

https://hdl.handle.net/11511/55828

Journal

JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY

DOI

https://doi.org/10.1081/ma-120018112

Collections

Graduate School of Natural and Applied Sciences, Article

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Citation Formats

A. Usanmaz and N. Cevik, “X-ray and mass spectral analysis of poly phenylisocyanate obtained by complex base catalyst,” JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY, pp. 239–250, 2003, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/55828.