Effect of crystallinity on PVC physical properties
ISSN: |
0193-7197
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Keywords: |
Chemistry ; Chemical Engineering
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Source: |
Wiley InterScience Backfile Collection 1832-2000
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Topics: |
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Process Engineering, Biotechnology, Nutrition Technology
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Notes: |
Crystallinity in PVC contributes significantly to the strength and resiliency of the polymer. Two types of crystallites have been described: a primary crystallite in the virgin powder state pictured as a platelet or flat needle-like lamellar crystallite, and a secondary, fringed micellar crystallite from melts or solutions. Both crystallites create loose, crosslinking networks. The secondary crystallite forms when plastisol melts are cooled or solutions are gelled. Crystallites exert a major effect on rheological properties. The thermal destruction of the primary crystallite networks in the melt phase results in a decrease in elastic modulus. Cooling from the fused state creates secondary crystallites that affect tensile and elongation.
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Additional Material: |
5 Ill.
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Type of Medium: |
Electronic Resource
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URL: |