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Four-center photopolymerization in the crystalline state

  • Masaki Hasegawa
Conference paper
Part of the Advances in Polymer Science book series (POLYMER, volume 42)

Abstract

A typical reaction of four-center photopolymerization is that of 2,5-distyrylpyrazine (DSP), which was reported by the author in 1967.

Since then, a large number of new polymer crystals have been prepared from conjugated diolefin crystals. All the polymers studied so far, are highly crystalline and three dimensionally oriented with the 1,3-trans cyclobutane and 1,4-phenylene groups alternating in the main chain.

In 1978 Lahav et al. (Weizmann Institute, Israel) succeeded in an absolute asymmetric syntheses of chiral oligomeric crystals by the four-center polymerization of achiral monomer.

X-ray crystallographic studies during the course of the reaction have demonstrated that the reaction is a typical topochemical process involving a direct rearrangement of the monomer crystal to the polymer crystal having an extended rigid rod-like structure. By x-ray analysis and DSC on the thermal depolymerization of the polymer crystal, a reversible topochemical process has been demonstrated for monomer and polymer crystals.

Considering these characteristics from an overall point of view, it is assumed that in the four-center photopolymerization, both polymerization process and polymer properties can provide suitable patterns for naturally occurring polymers.

Keywords

Differentially Scan Calorimetry Curve Crystalline State Chain Growth Polymer Crystal Cyclobutane Ring 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Masaki Hasegawa
    • 1
  1. 1.Faculty of EngineeringThe University of TokyoTokyoJapan

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