Thermal degradation of polycarbonate, poly(vinyl acetate) and their blends

Date

2006-12-01

Author

Uyar, Tamer
Tonelli, Alan E.
Hacaloğlu, Jale

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We have recently developed a novel approach for intimately mixing thermodynamically incompatible polymers, which utilizes the formation of inclusion compounds (ICs) formed with host cyclodextrins (CDs), followed by removal of CD and coalescence of the common guest polymers into a blend. In this paper direct insertion probe pyrolysis mass spectrometry (DIP-MS) analyses of polycarbonate (PC), poly(vinyl acetate) (PVAc) and PC/PVAc blends, obtained by coalescence from their inclusion compounds formed with host gamma-CD (coalesced blend) and by coprecipitation (physical blend), have been performed. Variations in the thermal stabilities of the coalesced polymers were recorded both by TGA and DIP-MS and compared to the corresponding as-received polymers. It has been determined that for both coalesced and physical blends of PC/PVAc, CH3COOH formed by deacetylation of PVAc above 300 degrees C, reacts with PC chains decreasing their thermal stability. This process was more effective for the physical blend, most likely due to enhanced diffusion of CH3COOH, produced by deacetylation of PVAc, into the PC domains, where it can further react producing low molecular weight PC fragments bearing methyl carbonate chain ends

Subject Keywords

Polycarbonate, Poly(vinyl acetate), Blend, Cyclodextrin, Inclusion compound, Pyrolysis mass spectrometry

URI

https://hdl.handle.net/11511/30764

Journal

Polymer Degradation and Stability

DOI

https://doi.org/10.1016/j.polymdegradstab.2006.08.028

Collections

Graduate School of Natural and Applied Sciences, Article

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Thermal degradation processes of poly(carbonate) and poly(methyl methacrylate) in blends coalesced either from their common inclusion compound formed with γ-cyclodextrin or precipitated from their common solution Uyar, Tamer; Oguz, Gulcan; Tonelli, Alan E.; Hacaloğlu, Jale (2006-10-01) Direct insertion probe pyrolysis mass spectrometry (DIP-MS) analyses of a PC/PMMA blend, coalesced from their common inclusion compound (ICs) formed with host gamma-cyclodextrin (gamma-CD) through removal of the gamma-CD host, and a physical PC/PMMA blend, precipitated from their common solution, have been performed and compared with those of the coalesced and as-received homopolymers. A slight increase in the thermal stability of the PMMA component in the presence of PC was recorded both by TGA and DIP-MS ...
Pyrolysis mass spectrometry analysis of poly(vinyl acetate), poly(methyl methacrylate) and their blend coalesced from inclusion compounds formed with γ-cyclodextrin Uyar, Tamer; Aslan, Evren; Tonelli, Alan E.; Hacaloğlu, Jale (2006-01-01) Direct insertion probe pyrolysis mass spectrometry (DIP-MS) analyses of poly(methyl methacrylate) (PMMA), poly(vinyl acetate) (PVAc) and binary PMMA/PVAc guests, coalesced from their inclusion compounds (ICs) formed with host gamma-cyclodextrin (gamma-CD) through removal of the gamma-CD host, have been performed. A slight increase in the thermal stabilities of the coalesced polymers were recorded both by TGA and DIP-MS compared to the corresponding as-received polymers. The DIP-MS observations pointed out t...
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Pyrolysis mass spectrometry analysis of polycarbonate/poly(methyl methacrylate)/poly(vinyl acetate) ternary blends Uyar, Tamer; Rusa, Cristian C.; Tonelli, Alan E.; Hacaloğlu, Jale (2007-01-01) Direct insertion probe pyrolysis mass spectrometry (DIP-MS) analyses of polycarbonate/poly(methyl methacrylate)/poly(vinyl acetate), (PC/PMMA/PVAc), ternary blends have been performed. The PC/PMMA/PVAc ternary blends were obtained by coalescing from their common gamma-cyclodextrin-inclusion compounds (CD-ICs), through the removal of the gamma-CD, host (coalesced blend), and by a co-precipitation method (physical blend). The coalesced ternary blend showed different thermal behaviors compared to the co-precip...
Intimate blending of binary polymer systems from their common cyclodextrin inclusion compounds Uyar, Tamer; Rusa, Cristian C.; Wang, Xingwu; Rusa, Mariana; Hacaloğlu, Jale; Tonelli, Alan E. (2005-09-15) A procedure for the formation of intimate blends of three binary polymer systems polycarbonate (PC)/poly(methyl methacrylate) (PMMA), PC/poly(vinyl acetate) (PVAc) and PMMA/PVAc is described. PC/PMMA, PC/PVAc, and PMMA/PVAc pairs were included in gamma-cyclodextrin (gamma-CD) channels and were then simultaneously coalesced from their common gamma-CD inclusion compounds (ICs) to obtain intimately mixed blends. The formation of ICs between polymer pairs and gamma-CD were confirmed by wide-angle X-ray diffract...

Citation Formats

T. Uyar, A. E. Tonelli, and J. Hacaloğlu, “Thermal degradation of polycarbonate, poly(vinyl acetate) and their blends,” Polymer Degradation and Stability, pp. 2960–2967, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30764.