In situ microfibrillar blends and composites of polypropylene and poly (ethylene terephthalate): Morphology and thermal properties |
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Authors: | Karingamanna Jayanarayanan Sabu Thomas Kuruvilla Joseph |
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Affiliation: | (1) Department of Chemical Engineering and Materials Science, Amrita Vishwa Vidyapeetham, Coimbatore, 641 105, Tamil Nadu, India;(2) School of Chemical Sciences, Mahatma Gandhi University, Priyadarshini Hills P.O, Kottayam, 686 560, Kerala, India;(3) Department of Chemistry, Indian Institute of Space Science and Technology, ISRO P.O, Thiruvananthapuram, 695 022, Kerala, India |
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Abstract: | Microfibrillar blends were prepared from polypropylene and poly (ethylene terephthalate) by extrusion followed by cold drawing.
The draw ratio employed had a prominent effect on the aspect ratio of the microfibrils produced, as revealed by scanning electron
microscopy. The subsequent isotropization step between the Tm of the polymers created microfibrillar composites with randomly oriented short microfibrils of poly (ethylene terephthalate).
The X ray diffraction patterns of the microfibrillar blends were different from those of corresponding composites although
the polypropylene phase in both exhibited predominantly the presence of α crystallites. The crystallization of the polypropylene
phase was affected by the orientation and diameter of the poly (ethylene terephthalate) microfibrils. The short microfibrils
in the microfibrillar composites were not effectual in hastening the crystallization of polypropylene. The thermal decomposition
studies revealed the capability of microfibrillar blends to delay the degradation better than the microfibrillar composites. |
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