ISSN:
0887-6266
Keywords:
ionomers
;
plasticization
;
PMMA
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Atactic poly(methyl methacrylate) was partially hydrolyzed in concentrated sulfuric acid to obtain methacrylic acid contents (MAA) of 3-12 mol %. The resulting copolymers were characterized by differential scanning calorimetry, Fourier transform infrared spectroscopy (FTIR), and gel permeation chromatography. The dynamic mechanical properties of these copolymers were studied in the glass transition region at a frequency of 1 Hz following neutralization with various low-molecular weight linear (e.g., octylamine) and rigid (e.g., 1-adamantanamine, ADA) primary amines. While the addition of linear amines to the copolymers was found to depress Tg, the addition of ADA had relatively little effect. FTIR spectra of all these blends indicated that proton transfer occurred from the MAA units to the amines, resulting in H-bonded ion pairs which behaved mechanically as grafts. Itwas concluded that the ion pairs resulting from protonation of the ADA units by MAA are less effective at reducing free volume than similar ones resulting from the reaction of a sulfonic acid with ADA. © 1993 John Wiley & Sons, Inc.
Additional Material:
13 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/polb.1993.090310311
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