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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
Date
2006-10-01
Author
Uyar, Tamer
Oguz, Gulcan
Tonelli, Alan E.
Hacaloğlu, Jale
Metadata
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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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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 compared to the corresponding homopolymers. The DIP-MS observations pointed out that the thermal stability and degradation products of these polymers are affected once they are included inside the IC channels created by the stacked host CDs. DIP-MS observations suggested that for both coalesced and physical PC/PMMA blends, an exchange reaction occurs between carbonates of PC and MMA, formed by depolymerization of PMMA above 300 degrees C, most likely due to diffusion of MMA monomer at the interface or even into the PC domains, where it can react producing low molecular weight PC bearing methyl carbonate and methacrylate chain ends. The results also indicated an ester-ester interchange reaction between PC and PMMA yielding a graft copolymer and low molecular weight PC chains bearing methyl carbonate end groups in the case of the coalesced blend. This can be atttributed to the presence of specific molecular interactions between the intimately mixed PMMA and PC chains in the coalesced PC/PMMA blend.
Subject Keywords
Cyclodextrin
,
Inclusion compound
,
Poly(methyl methacrylate)
,
Polycarbonate
,
Blend
,
Thermal degradation
URI
https://hdl.handle.net/11511/31547
Journal
Polymer Degradation and Stability
DOI
https://doi.org/10.1016/j.polymdegradstab.2006.03.006
Collections
Graduate School of Natural and Applied Sciences, Article
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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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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...
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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...
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T. Uyar, G. Oguz, A. E. Tonelli, and J. Hacaloğlu, “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,”
Polymer Degradation and Stability
, pp. 2471–2481, 2006, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31547.