Exploring Factors that Determine Cis/Trans Structure and Tacticity in Polymers Prepared by Ring Opening Metathesis Polymerizations Involving Initiators of the Type Syn and Anti Mo(NAr)(CHCMe2Ph)(OR)2. Observation of a Temperature Dependent Cis/Trans Ratio.

Abstract

The factors that determine the structure (cis/trans and tacticity) of polymers prepared by ring opening metathesis polymerization (ROMP) Using well-defined initiators of the type Mo(NAryl)(CHCMe2Ph)(OR)2 (Aryl = a substituted aryl group and OR = a variety of alkoxides) have been explored. The main finding is a dependence of cis/trans structure on temperature; at low temperatures (-35 deg C) all cis polymer is formed and at high temperatures (65 deg C) up to 90% trans polymers are formed. These results are consistent with formation of cis polymer from syn alkylidene rotamers and trans polymer from anti alkylidene rotamers in circumstances where syn and anti rotamers can interconvert. jg

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Document Details

Document Type
Technical Report
Publication Date
Jun 14, 1995
Accession Number
ADA295717

Entities

People

  • Jin-kyu Lee
  • John H. Oskam
  • Richard O'dell
  • Richard R. Schrock

Organizations

  • Massachusetts Institute of Technology

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Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes

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  • Abstracts
  • Catalysts
  • Chemical Reaction Properties
  • Chemical Reactions
  • Chemical Shifts
  • Chemical Synthesis
  • Chemistry
  • Equations
  • Exchange Reactions
  • Explosives Initiators
  • High Temperature
  • Low Temperature
  • Polymerization
  • Polymers
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  • United States

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  • Chemistry

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  • Organic Chemistry
  • Polymer Science and Technology