EFFECT OF STEREO AND COMONOMER DEFECTS ON CRYSTALLINE AND AMORPHOUS PHASES IN POLYPROPYLENE

Gallaschun, Cassandra (2019) EFFECT OF STEREO AND COMONOMER DEFECTS ON CRYSTALLINE AND AMORPHOUS PHASES IN POLYPROPYLENE. Master's Thesis, University of Pittsburgh. (Unpublished)

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Abstract

Solution state nuclear magnetic resonance (NMR) will be used to measure the tacticity and ethylene incorporation of a matrix of samples containing, homopolymer, random, impact copolymer and branched samples. Solid state NMR will be used to investigate the rigid and mobile thickness along with the fractions of each type. Annealed and thermal fractionation stepwise crystallization differential scanning calorimetry will be used to measure the lamella thickness and amorphous phase thickness of various types of polypropylene. The crystallinity will also be investigated by annealed differential scanning calorimetry (ADSC). Dynamic mechanical analysis will be used to further investigate the amorphous phase. The chemical and crystal structure data collected will then be used to compare against predicted trends in literature of a series of mechanical tests, such as, tensile, flex, and two types of impact. The work showed the initial application of spin diffusion solid state NMR and thermal fractionation for lamellae characterization on branched polypropylene. Branching was found to increase the rigid fraction and the lamellae thickness, as branching increased.

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Details

Item Type:	University of Pittsburgh ETD
Status:	Unpublished
Creators/Authors:	Creators Email Pitt Username ORCID Gallaschun, Cassandra clg85@pitt.edu clg85
ETD Committee:	Title Member Email Address Pitt Username ORCID Committee Chair Velankar, Sachin velankar@pitt.edu velankar Committee Member Enick, Robert rme@pitt.edu rme Committee Member Li, Lei lel55@pitt.edu lel55 Committee Member Achary, Damodaran damodak@pitt.edu damodak
Date:	23 January 2019
Date Type:	Publication
Defense Date:	20 November 2018
Approval Date:	23 January 2019
Submission Date:	12 November 2018
Access Restriction:	No restriction; Release the ETD for access worldwide immediately.
Number of Pages:	112
Institution:	University of Pittsburgh
Schools and Programs:	Swanson School of Engineering > Chemical Engineering
Degree:	MS - Master of Science
Thesis Type:	Master's Thesis
Refereed:	Yes
Uncontrolled Keywords:	Polypropylene, Solution state nuclear magnetic resonance, Solid state nuclear magnetic resonance,Annealed differential scanning calorimetry,Stepwise crystallization differential scanning calorimetry,Lamella thickness, tacticity, comonomer
Date Deposited:	23 Jan 2019 15:22
Last Modified:	23 Jan 2019 15:22
URI:	http://d-scholarship.pitt.edu/id/eprint/35652

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• EFFECT OF STEREO AND COMONOMER DEFECTS ON CRYSTALLINE AND AMORPHOUS PHASES IN POLYPROPYLENE. (deposited 23 Jan 2019 15:22) [Currently Displayed]

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