Mechanism of the Initiation of the Cationic Polymerization of Styrenes by Silanes and Activated Covalent Esters

reportActive / Technical Report | Accession Number: ADA206502 | Open PDF

Abstract:

Mechanism of the initiation of the cationic polymerization of styrenes by silanes and activated covalent species has been studied by NMR and SEC. Trimethylsilyl trifluoromethanesulfonate has been used as initiator for the cationic polymerization of styrene. It has been found that silyl triflate does not react directly with styrene but polymerization is initiated by the trace amount of the triflic acid formed by the hydrolysis of trimethylsilyl triflate. Polymer end groups do not contain silyl groups, polymerization is strongly inhibited by hindered pyridine and starts only after pyridine is completely consumed. Hexamethyldisiloxane has found in the reaction products. Trimethylsilyl triflate, Polysilanes, Modifications, Cationic polymerization, Styrene.

Author(s):
Matyjaszewski, K.
Author Organization(s):
CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF CHEMISTRY
Descriptive Note:
Technical rept.
Supplementary Note:
DOI: 10.21236/ADA206502
Pagination:
0011

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-9
Contract/Grant Number(s):
N00014-87-K-0116
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means; JCA_6.3.3_Spectrum Management; JCA_6.3_Net Management; JCA_6_Net Centric
Modernization Areas:
Microelectronics
Communities of Interest:
Materials and Manufacturing Processes
Descriptor(s):
*CATIONS, *STYRENES, *POLYSILANES, *SILANES, *POLYMERIZATION, COVALENT BONDS, REACTANTS(CHEMISTRY), SILOXANES, HYDROLYSIS, ESTERS, POLYMERS, METHYL RADICALS, ACTIVATION
Field(s)/Group(s):
Organic Chemistry, Polymer Chemistry
Keyword(s):
*TRIFLATE TRIMETHYLSILYL
Report Date:
1989 Mar 23