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
| Autor: | Gulcan Oguz, Jale Hacaloglu, Alan E. Tonelli, Tamer Uyar |
|---|---|
| Přispěvatelé: | OpenMETU |
| Rok vydání: | 2006 |
| Předmět: |
Poly(methyl methacrylate)
Polymers and Plastics Blend Methacrylate Inclusion compound chemistry.chemical_compound Polymer chemistry Materials Chemistry Copolymer Cyclodextrin Thermal stability Polycarbonate chemistry.chemical_classification technology industry and agriculture food and beverages Polymer Condensed Matter Physics body regions chemistry Mechanics of Materials visual_art Thermal degradation visual_art.visual_art_medium Polymer blend |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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