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Date Permissions Signed
9-7-2018
Date of Award
Fall 2018
Document Type
Masters Thesis
Degree Name
Master of Science (MS)
Department
Chemistry
First Advisor
Rider, David A. (Materials scientist)
Second Advisor
O'Neil, Gregory (Gregory W.)
Third Advisor
Misasi, John M.
Abstract
The solubility, polymerization, and the macromolecular characterization of cured blends of BPA-based benzoxazine (BA-a) in end group tosylated poly(ethylene glycol) (mPEGOTs), polysulfone (PSUOTs), and poly(D,L-lactic acid) (PDLLAOTs) are studied and compared to their hydroxyl terminated analogues. The cure temperature for BA-a blends with tosylated polymers was reduced by ~60 °C compared to that of the pure BA-a. This confirms that the tosylated polymer is an accelerant for BA-a ring opening polymerization (ROP). There are two proposed mechanism for the production of free tosylate and cationic BA-a based initiators as a cure catalyst for BA-a ROP – where the former was detected by TGA-FTIR and TGA-MS. SEM confirmed a grafted polymer network from BA-a and mPEGOTs, P(BA-a)-graft-mPEGOTs, this homogenous microstructure was also found in PBA-a/PSUOTs blends. The glass transition temperature and the thermal stability of the P(BA-a)-graft-mPEGOTs can be tuned based on the composition of the BA-a/mPEGOTs resin. The potential applications of such grafted polymers may lead to novel materials for the biomedical plastics, electronics, membranes, and aerospace industries. Further blends were prepared with microparticles of silica (SiOH) and the tosylate- (SiOTs) and phenyl- (SiPh) functionalized analogues. Increased modulus of PBA-a was found in all silica blends, the reduction in cure temperature was found only in blends of BA-a and SiOTs. By SEM, PBA-a/SiOTs blends were determined to have a unique morphology. Three benzoxazine-based surfactants were synthesized from the coupling of p-hydroxy methylbenzoxazine with mPEGOTs. All three surfactants had good monomer loading, up to 4.72 monomer to surfactant by mass.
Type
Text
Keywords
benzoxazine, poly(ethylene glycol), polysulfone, ploly(lactic acid), silica, blends, accelerant, grafted polymers, surfactant, miscible
DOI
https://doi.org/10.25710/a7r8-tc22
Publisher
Western Washington University
OCLC Number
1052622835
Subject – LCSH
Graft copolymers; Graft copolymers--Effect of temerature on; Chemical kinetics--Effect of temperature on; Surface active agents; Chemistry, Organic
Format
application/pdf
Genre/Form
masters theses
Language
English
Rights
Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this thesis for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.
Rights Statement
http://rightsstatements.org/vocab/InC-EDU/1.0/
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Recommended Citation
Brown, Emily A., "Improved Thermal and Mechanical Properties and Increased Miscibility of Polybenzoxazine in Blends with Functionalized Thermoplastics and Particles" (2018). WWU Graduate School Collection. 764.
https://cedar.wwu.edu/wwuet/764