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

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

215
views

0
downloads

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

Suggestions

OpenMETU
Core

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...
Thermal degradation of polycarbonate, poly(vinyl acetate) and their blends Uyar, Tamer; Tonelli, Alan E.; Hacaloğlu, Jale (2006-12-01) 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...
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...
Thermal degradation of Polylactide/Poly(ethylene glycol) fibers and composite fibers involving organoclay Ozdemir, Esra; Hacaloğlu, Jale (2018-01-01) In this study, electrospun fibers of melt blended poly(lactic acid) and poly(ethylene glycol), (PLA)-PEG blends involving 10, 15 and 20 wt% PEG and their corresponding composites with organically modified montmorillonite, Cloisite 30B were prepared and characterized by x-ray diffraction, differential scanning calorimetry, thermogravimetry and direct pyrolysis mass spectrometry techniques. The narrower fiber diameters observed for the PLA-PEG fibers involving organoclay compared to the corresponding neat fib...
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, 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.