Study of the non-isothermal crystallization of poly(ethylene oxide)/poly(methyl methacrylate) blends |
| |
| Affiliation: | 1. School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China;2. National Demonstration Centre for Experimental Materials Science and Engineering Education, School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China;3. College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, China;1. Consiglio Nazionale delle Ricerche, Istituto per i Polimeri, Compositi e Biomateriali, c/o Comprensorio Olivetti, Via Campi Flegrei, 34, 80078 Pozzuoli, NA, Italy;2. Martin-Luther-University Halle-Wittenberg, Center of Engineering Sciences, D-06099 Halle/Saale, Germany;1. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China |
| |
| Abstract: | Crystallization during cooling of a poly(ethylene oxide)/poly(methyl methacrylate) (PEO/PMMA) blend has been studied using differential scanning calorimetry. Five different cooling rates Vr have been used (namely 10, 5, 2.5, 1.25 and 0.625°C min−1). The presence of PMMA for a given Vr reduces the overall PEO crystallization rate. This effect can be ascribed to reduction of the mobility of the crystallizable chains due to the presence of the amorphous component. It was found that in quasi-static conditions at lower Vr, when nucleation and growth processes are determined by a thermal mechanism alone, the experimental data for the pure PEO and the PEO/PMMA and blends agree quite well with the theoretical results obtained using the zero-order approximation of Ziabicki's theory. At higher Vr, in the case of the blends, athermal nucleation cannot be neglected, and then the same approximation does not fit the experimental results. The experimental data analysed showed no agreement with Ozawa's theoretical predictions. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
