Crystallization of polypropylene in the presence of a rigid and flexible additive

The effect of a rigid additive (nano-SiO₂ filler) and a flexible additive [poly(dimethylsiloxane) elastomer] on the crystallization of polypropylene was studied under nonisothermal conditions with differential scanning calorimetry. Crystallization parameters were evaluated with standard equations, a...

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Bibliographic Details
Published in:Journal of applied polymer science 2008-04, Vol.108 (2), p.1298-1306
Main Authors: Prakashan, K, Gupta, A.K, Maiti, S.N
Format: Article
Language:English
Subjects:
Applied sciences
Composites
Crystallization
Exact sciences and technology
Forms of application and semi-finished materials
nanocomposites
Organic polymers
Physicochemistry of polymers
poly(propylene) (PP)
Polymer industry, paints, wood
Properties and characterization
Technology of polymers
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Summary:The effect of a rigid additive (nano-SiO₂ filler) and a flexible additive [poly(dimethylsiloxane) elastomer] on the crystallization of polypropylene was studied under nonisothermal conditions with differential scanning calorimetry. Crystallization parameters were evaluated with standard equations, and the results were interpreted on the basis of the rate of nucleation, crystallization, and activation energy of crystallization. The observed effect of polydimethylsiloxane of increasing the crystallization rate and lowering the activation energy of crystallization was attributed to the effect of polydimethylsiloxane chain mobility at the interface, which facilitated the molecular mobility of polypropylene. Nano-SiO₂, on the other hand, acted as a nucleating agent, and the nucleation effect was dependent on the cooling rate. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
ISSN:0021-8995
1097-4628
DOI:10.1002/app.27751