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Title: A study of the mobility of poly(methyl methacrylate)-silicate interpenetrating networks with {sup 2}H NMR

Abstract

Poly(methyl methacrylate) (PMMA)/silicate interpenetrating networks (IPNs) have been synthesized in formic acid solutions. The fast gelation times observed in these solutions reduced the phase separation of the polymer, and the 50% by weight PMMA/silicate hybrid showed virtually no evidence of a glass transition (T{sub g}) from thermomechanical data. {sup 2}H NMR showed that the PMMA is extremely mobile in the wet gels, and liquid-like {sup 2}H NMR spectra are observed even after prolonged aging of the samples. A {sup 2}H static NMR lineshape, indicative of the rigid polymer, does not occur until polymer to solvent ratios of approximately 0.2 (weight basis) are attained. Motional narrowing of the {sup 2}H resonances is not observed in the vacuum-dried IPNs below 180 C. In contrast, pure PMMA shows motional narrowing between 150 and 180 C. There was little evidence of isotropic motion of the polymer chains, for low polymer concentrations, up to the highest temperature studied (200 C). The percentage of polymer undergoing isotropic motion increased with polymer content, and as a function of the aging time before solvent stripping.

Authors:
 [1];  [2]
  1. State Univ. of New York, Stony Brook, NY (United States). Dept. of Chemistry
  2. DuPont, Wilmington, DE (United States)
Publication Date:
Sponsoring Org.:
National Science Foundation, Washington, DC (United States)
OSTI Identifier:
427695
Report Number(s):
CONF-960401-
ISBN 1-55899-338-X; TRN: IM9708%%21
Resource Type:
Book
Resource Relation:
Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 8-12 Apr 1996; Other Information: PBD: 1996; Related Information: Is Part Of Better ceramics through chemistry 7: Organic/inorganic hybrid materials; Coltrain, B.K. [ed.] [Eastman Kodak Co., Rochester, NY (United States)]; Sanchez, C. [ed.] [Univ. Pierre et Marie Curie, Paris (France)]; Schaefer, D.W. [ed.] [Sandia National Labs., Albuquerque, NM (United States)]; Wilkes, G.L. [ed.] [Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States)]; PB: 695 p.; Materials Research Society symposium proceedings, Volume 435
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ORGANIC SILICON COMPOUNDS; SOL-GEL PROCESS; MICROSTRUCTURE; PMMA; SILICATES; FORMIC ACID; SILANES; SOLUTIONS; NUCLEAR MAGNETIC RESONANCE; HYDROGEN; MOBILITY; SILICON 29; EXPERIMENTAL DATA

Citation Formats

Grey, C P, and Sharp, K G. A study of the mobility of poly(methyl methacrylate)-silicate interpenetrating networks with {sup 2}H NMR. United States: N. p., 1996. Web.
Grey, C P, & Sharp, K G. A study of the mobility of poly(methyl methacrylate)-silicate interpenetrating networks with {sup 2}H NMR. United States.
Grey, C P, and Sharp, K G. Tue . "A study of the mobility of poly(methyl methacrylate)-silicate interpenetrating networks with {sup 2}H NMR". United States.
@article{osti_427695,
title = {A study of the mobility of poly(methyl methacrylate)-silicate interpenetrating networks with {sup 2}H NMR},
author = {Grey, C P and Sharp, K G},
abstractNote = {Poly(methyl methacrylate) (PMMA)/silicate interpenetrating networks (IPNs) have been synthesized in formic acid solutions. The fast gelation times observed in these solutions reduced the phase separation of the polymer, and the 50% by weight PMMA/silicate hybrid showed virtually no evidence of a glass transition (T{sub g}) from thermomechanical data. {sup 2}H NMR showed that the PMMA is extremely mobile in the wet gels, and liquid-like {sup 2}H NMR spectra are observed even after prolonged aging of the samples. A {sup 2}H static NMR lineshape, indicative of the rigid polymer, does not occur until polymer to solvent ratios of approximately 0.2 (weight basis) are attained. Motional narrowing of the {sup 2}H resonances is not observed in the vacuum-dried IPNs below 180 C. In contrast, pure PMMA shows motional narrowing between 150 and 180 C. There was little evidence of isotropic motion of the polymer chains, for low polymer concentrations, up to the highest temperature studied (200 C). The percentage of polymer undergoing isotropic motion increased with polymer content, and as a function of the aging time before solvent stripping.},
doi = {},
url = {https://www.osti.gov/biblio/427695}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {12}
}

Book:
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