Accession Number:

AD0611644

Title:

POLYMERIZATION OF METHYL METHACRYLATE INITIATED BY 1, 1-DIPHENYLHEXYL LITHIUM,

Descriptive Note:

Corporate Author:

NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF APPLIED CHEMISTRY

Personal Author(s):

Report Date:

1964-07-24

Pagination or Media Count:

11.0

Abstract:

The low-temperature polymerization of methyl methacrylate in toluene solution was studied using 1, 1diphenyl-n-hexyl-lithium DPHL as initiator. Kinetic data, rates of lithium methoxide formation, and polymer tacticities are reported for experiments at 0, -30 and -80C. The molecular weight distribution of a polymer prepared at -30C was determined. These results are compared with those obtained under comparable conditions using butyl-lithium as initiator. Much simpler kinetic behaviour occurs with DPHL than with butyl-lithium initiator. The amount of lithium methoxide formed is much smaller with the former and is, approximately, a constant fraction of initiator as is the number of molecules of low molecular weight product. The polymerization rate is first order in both monomer and initiator concentrations as expected if the number of growing polymer chains is linearly dependent on initiator concentration. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE