ISSN:
0959-8103
Keywords:
PE-PS IPN system
;
spin probe method
;
molecular mobility in polymer systems
;
correlation time
;
EPR spectra
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
The spin probe method has been used to study the structure and molecular mobility of PS-PE IPN with various ratios of PS:PE. The dependence of the correlation times of motion of the spin probe and the linwidths of the EPR spectra on the composition of the IPN system and its thermal processing has been studied. The results imply that rotation correlation time of the probe is highest at the ratio PS:PE 1.5:0.5 and lowest at the ratio 0.75:1.25. The value of τ decreases with decreasing content of PS. At the transition from the ratio PS:PE 1.25:0.75 to 1:1 τ decreases sharply to a value close to the correlation time of PE. In the temperature range 173-373 K there are two domains which differ in molecular mobility. At temperatures above Tm of PE, heterogeneity is observed for samples with ratio of PE 1 or 0.75. Annealing at 473 K makes the samples homogeneous, which means that mixing of the chains of both polymers is observed in the interpenetrating regions.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pi.1994.210350412
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