The vast majority of theses in this collection are open access and freely available. There are a small number of theses that have access restricted to the WWU campus. For off-campus access to a thesis labeled "Campus Only Access," please log in here with your WWU universal ID, or talk to your librarian about requesting the restricted thesis through interlibrary loan.

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

Publisher

Western Washington University

OCLC Number

1052622835

Genre/Form

masters theses

Language

English

Rights

Copying of this thesis 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

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Available for download on Tuesday, September 10, 2019

Included in

Chemistry Commons

Share

COinS