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Improved Thermal and Mechanical Properties and Increased Miscibility of Polybenzoxazine in Blends with Functionalized Thermoplastics and Particles
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Master of Science (MS)
Rider, David A. (Materials scientist)
O'Neil, Gregory (Gregory W.)
Misasi, John M.
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.
benzoxazine, poly(ethylene glycol), polysulfone, ploly(lactic acid), silica, blends, accelerant, grafted polymers, surfactant, miscible
Western Washington University
Subject – LCSH
Graft copolymers; Graft copolymers--Effect of temerature on; Chemical kinetics--Effect of temperature on; Surface active agents; Chemistry, Organic
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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.