Morphology, melting behavior, and non-isothermal crystallization of poly(butylene terephthalate)/poly(ethylene-co-methacrylic acid) blends
| Autor: | Jiann-Wen Huang, Chiun-Chia Kang, Shaw-Bing Wen, Mou-Yung Yeh, Ya-Lan Wen |
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| Rok vydání: | 2007 |
| Předmět: |
Materials science
Scanning electron microscope Isothermal crystallization Nucleation Recrystallization (metallurgy) Condensed Matter Physics law.invention chemistry.chemical_compound Differential scanning calorimetry Chemical engineering Perfect crystal Methacrylic acid chemistry law Polymer chemistry Physical and Theoretical Chemistry Crystallization Instrumentation |
| Zdroj: | Thermochimica Acta. 465:48-58 |
| ISSN: | 0040-6031 |
| Popis: | The morphology, melting behavior, and non-isothermal crystallization of poly(butylene terephthalate) (PBT) and poly(ethylene-co-methacrylic acid) (PEMA) blends were studied with scanning electron microscopy, X-ray diffraction and differential scanning calorimetry (DSC). PEMA forms immiscible, yet compatible, blends with PBT. Subsequent DSC scans on melt-crystallized samples exhibited two melting endotherms (TmI and TmII). The presence of PEMA would facilitate the recrystallization during heating scan and retard PBT molecular chains to form a perfect crystal in cooling crystallization. The dispersion phases of molten PEMA acts as nucleating agents to enhance the crystallization rate of PBT. The solidified PBT could act as nucleating agents to enhance the crystallization of PEMA, but also retard the molecular mobility to reduce crystallization rate. The U * and Kg of Hoffman–Lauritzen theory were also determined by Vyazovkin’s methods to support the interpretation. |
| Databáze: | OpenAIRE |
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