Unexplored Dimensions of Processing Phase Inversion during Polymer Melt Blending

Ramakrishnan, Shashank

Unexplored Dimensions of Processing Phase Inversion during Polymer Melt Blending

dc.contributor.advisor	Sundararaj, Uttandaraman
dc.contributor.author	Ramakrishnan, Shashank
dc.contributor.committeemember	Ponnurangam, Sathish
dc.contributor.committeemember	Lu, Qingye
dc.contributor.committeemember	Egberts, Philip
dc.contributor.committeemember	Mighri, Frej
dc.date	2024-06
dc.date.accessioned	2024-05-14T15:45:25Z
dc.date.available	2024-05-14T15:45:25Z
dc.date.issued	2024-05
dc.description.abstract	Blending of multiple polymers is a commonly utilized strategy to achieve a balance of a variety of critical properties of polymeric materials, such as strength, toughness, thermal stability, ductility, etc. Although exhaustive studies have helped understand the thermodynamic basis for the phase diagram of multi-component blended polymers, often it is the melt processing methodology adopted that governs the final morphology in the product and, in turn, its material properties. The work presented in this thesis deals with examining the morphological changes in polymer blends during the processing cycle. Specifically, when a binary polymer blend consisting of components with a large difference in their softening temperatures is processed, an inversion in the phase continuity occurs if the higher melting component is present at a larger volume fraction. This inversion in the phase continuity was coined as the processing-phase inversion. Although several studies have shown this type of processing induced inversion, a detailed understanding of the mechanism has not been fully revealed. In this thesis, we looked at understanding the influence of the nature of minor and major components, the occurrence of an in-situ reaction, and the addition of an inorganic nanofiller on the processing-phase inversion. Microscopic techniques, such as SEM or optical imaging, have been primarily used to characterize the different morphologies that occur during the inversion. In this thesis, we analyze the torque monitored during the mixing along with the recorded melt temperature to independently determine the region of inversion, apart from morphological imaging.
dc.identifier.citation	Ramakrishnan, S. (2024). Unexplored dimensions of processing phase inversion during polymer melt blending (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.
dc.identifier.uri	https://hdl.handle.net/1880/118750
dc.identifier.uri	https://doi.org/10.11575/PRISM/43593
dc.language.iso	en
dc.publisher.faculty	Schulich School of Engineering
dc.publisher.institution	University of Calgary
dc.rights	University of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subject	Polymer blends
dc.subject	morphology
dc.subject	polypropylene
dc.subject	Visualization
dc.subject.classification	Chemistry--Polymer
dc.title	Unexplored Dimensions of Processing Phase Inversion during Polymer Melt Blending
dc.type	doctoral thesis
thesis.degree.discipline	Engineering – Chemical & Petroleum
thesis.degree.grantor	University of Calgary
thesis.degree.name	Doctor of Philosophy (PhD)
ucalgary.thesis.accesssetbystudent	I do not require a thesis withhold – my thesis will have open access and can be viewed and downloaded publicly as soon as possible.