NDLI: Morphological characterization of branched PP under stretching

Content Provider	Springer Nature Link
Author	Oliani, W. L. Parra, D. F. Lima, L. F. C. P. Lugao, A. B.
Copyright Year	2012
Abstract	An effective approach to achieve high-melt strength polymer is to add long chain branches onto backbone species using gamma radiation. Grafting and branching result from macroradicals combinations during the irradiation process. Polypropylene films were prepared starting with irradiation process of the pellets with a 60Co source at doses of 5, 12.5, and 20 kGy under acetylene to improve melt strength and drawability. After irradiation, polypropylene films were obtained by compression molding, at 190 °C and pressure of 80 bar, and dive into a water tank at 23 °C, which generally favors the formation of an amorphous phase. The thin films were stretched at 170 °C using a universal testing machine. Film surface morphology and the thermal properties, were analyzed, using atomic force microscopy, scanning electron microscopy and differential scanning calorimetry. We had a different molecular structure that requested the study of their micro and nanostructure. The results showed some evidence of fibrillar structures containing crystallites and gel formation. Fibrils oriented along the stretching direction were observed.
Starting Page	2121
Ending Page	2130
Page Count	10
File Format	PDF
ISSN	01700839
Journal	Polymer Bulletin
Volume Number	68
Issue Number	8
e-ISSN	14362449
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-01-26
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Stretching Crosslinking Polypropylene and gamma radiation Characterization and Evaluation of Materials Polymer Sciences Physical Chemistry Soft and Granular Matter, Complex Fluids and Microfluidics
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Condensed Matter Physics Polymers and Plastics

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