Some physical and mechanical properties of isotactic-atactic poly(methyl methacrylate) blends and stereoblocks |
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| Affiliation: | 1. Department of Mathematics, University of Pittsburgh, USA;2. Center for the Neural Basis of Cognition, Pittsburgh, USA;3. School of Psychiatry, The University of New South Wales, Sydney, Australia;4. The Black Dog Institute, Sydney, Australia;5. Research Institute MOVE, VU University, Amsterdam, The Netherlands;6. School of Physics, The University of Sydney, Australia;7. Faculty of Medicine, The University of Sydney, Australia;8. Queensland Institute of Medical Research, Brisbane, Australia;9. Royal Brisbane and Women׳s Hospital, Brisbane, Australia;1. Biology Centre CAS, 370 05 České Budějovice, Czech Republic;2. National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8634, Japan;3. Institute of Sericulture, Iikura 1053, 300-0324 Ami-machi, Ibaraki, Japan;4. V.N. Karazin Kharkov National University, 61077 Kharkov, Ukraine;1. Suzhou Institute of Supervision and Inspection on Product Quality, Suzhou 215104, China;2. State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu 214122, China;1. Université de Lyon, INSA-Lyon, UMR CNRS 5223, Ingénierie des Matériaux Polymères, F-69622 Villeurbanne Cedex, France;2. Université de Lyon, Université Lyon 1, UMR CNRS 5223, Ingénierie des Matériaux Polymères, F-69622 Villeurbanne Cedex, France;1. Research and Development Centre, Bharathiar University, Coimbatore 641046, India;2. Department of Chemistry, St. Joseph''s College of Engineering, Chennai 600119, India;3. Department of Chemistry, Dr. Ambedkar Govt. Arts College, Chennai 600039, India |
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| Abstract: | Dynamic-mechanical, DSC, and fracture-toughness measurements are reported for blends of it-PMMA with at-PMMA and syndiotactic-rich PMMA, both in the amorphous state and after solvent and thermally induced crystallization. Crystalline stereocomplex forms even in the blends of 74% isolactic with commercial at-PMMA under SIC. Some stereoblock PMMA shows two melting points and two distinct crystalline forms; one corresponds to it-PMMA the other probably to stereocomplex. Microcrystallinity in the blends greatly enhances stiffness. The decline of the storage shear modulus with temperature involves several processes. Blending of it-PMMA (even low mol. wt) into at-PMMA greatly improves its fracture toughness. |
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