Journal ArticleDOI
Effect of CaCO3 on the crystallization behaviour of polypropylene
TLDR
In this paper, the effect of CaCO3 on polypropylene (PP) crystallization behavior and the modification of structure was investigated using X-ray diffraction and optical microscopy.Abstract:
The effect of CaCO3 on the crystallization behaviour and the modification of structure in polypropylene (PP) has been investigated using X-ray diffraction and optical microscopy. The crystallization half time deduced from spherulitic growth rate was found to vary sharply and decreased considerably from 5–6 min for pure polymer to less than 2 min in the presence of CaCO3. The ultimate spherulite size also decreased considerably for PP containing CaCO3. Its dependance on composition however, showed a plateau region at about 10–15 wt % of additive. The intensities of certain reflections especially the 130 and 040 of the α phase were greatly affected by the presence of CaCO3 and large variations in the crystallinity (Ci) values were observed with composition. The ratio of intensities of 130 and 040 reflections and theCi revealed a maximum at a certain concentration of CaCO3. The above results can be explained on the basis of nucleation and preferential growth of the α phase of PP crystallites.read more
Citations
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PatentDOI
Polypropylene/calcium carbonate nanocomposites
TL;DR: In this article, a composite material comprising calcium carbonate particles dispersed within a polypropylene matrix was proposed, where the particles have a size within the range of 1 to 100 nm and a filling ratio of less than about 30% by volume.
Journal ArticleDOI
Crystallization of tethered polyethylene in confined geometries
TL;DR: In this article, the effects of chain tethering on the crystallization of tethered PE in confined geometries were examined through comparison of singly-tethered PE chains in PE-PVCH (EV) diblocks and doubly-topped PE in PVCH-PE-PVTCH (VEV) triblocks.
Journal ArticleDOI
Effect of Supercritical Gas on Crystallization of Linear and Branched Polypropylene Resins with Foaming Additives
TL;DR: In this paper, the thermal properties of linear and branched polypropylene with foaming additives were investigated using a normal and a high-pressure differential scanning calorimeter (DSC).
Journal ArticleDOI
Preparation of high performance composites based on aluminum nitride/poly(ether–ether–ketone) and their properties
TL;DR: In this paper, high performance aluminum nitride (AlN)/poly(ether-ether-ketone) (PEEK) composites containing 0.50% fractions of AlN were prepared by solution blending method followed by hot pressing to evaluate their density, melting temperature, crystallization, thermal stability, morphological behavior and Vickers hardness by using different characterization techniques.
References
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Book
Structure and properties of oriented polymers
TL;DR: This book reftects the growth of interest in this area of polymer science and attempts to give the reader an up to date view of the present position.
Journal ArticleDOI
Polymorphism in isotactic polypropylene
TL;DR: In this article, the authors summarize the studies devoted to the elucidation of the different crystal structures and crystal morphologies and the different conditions favouring one or the other of the polymorphs of isotactic polypropylene.
Book
Handbook Of Fillers For Plastics
Harry S. Katz,John V. Milewski +1 more
TL;DR: In this article, the authors present a review of the state-of-the-art techniques used by manufacturers of plastics products and fillers, plastics designers, engineers and polymer chemists.
BookDOI
Developments in oriented polymers
TL;DR: A review of the state of the art in the field of oriented polymers can be found in this paper, where the authors provide up-to-date reviews of the current state-of-the-art in the area of polymer science.
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