Porous product with reduced apparent density keeps good mechanical properties. Extruded composites of poly(vinyl chloride) blown under microwave irradiation |
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| Institution: | 1. Cracow University of Technology, Department of Chemistry and Technology of Polymers, Warszawska 24, 31-155 Kraków, Poland;2. UTP University of Sciences and Technology, Faculty of Chemical Technology and Engineering, Seminaryjna 3, 85-326 Bydgoszcz, Poland;1. International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala 686560, India;2. School of Chemical Sciences, Mahatma Gandhi University, Kottayam, Kerala 686560, India;3. Department of Physics, Birla Institute of Technology & Science, Pilani, Hyderabad 500078, India;4. Normandie Univ, UNIROUEN Normandie, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France;5. Department of Soil, Plant and Food Sciences, University of Bari “Aldo Moro”, Via Amendola 165/A, 70126 Bari, Italy;6. School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam, Kerala 686560, India;1. Lab of Advanced Elastomer, South China University of Technology, Guangzhou, 510640, China;2. The Key Laboratory of Polymer Processing Engineering, Ministry of Education, China (South China University of Technology), Guangzhou, 510640, China;3. College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China;4. State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China;1. LabMAT, Department of Civil and Environmental Engineering, University of Bío-Bío, 4051381 Concepción, Chile;2. Department of Mechanical Engineering, University of the Basque Country, 48013 Bilbao, Spain;3. Department of Civil Engineering, Federal University of São Carlos – UFSCar, São Carlos, São Paulo, Brazil |
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| Abstract: | New foaming method, enhanced by microwave irradiation, was elaborated and applied to obtain porous poly(vinyl chloride) and its composites with fine cell structure. The so called “thermal runaway” effect was observed during the heating of poly(vinyl chloride) under microwave irradiation. The temperature of this effect decreases as a result of additives incorporation into polymer matrix. Microwave irradiation allowed effective heating of extruded poly(vinyl chloride) and its composites with carbon black (CB) filler, behind the extruder head and decomposing azodicarbonamide (ADC) to obtain porous products. The use of CB additive to poly(vinyl chloride) significantly increased its ability to be heated under microwave irradiation as well as improved the cell structure and decreased the apparent density of final products.Among additionally used fillers (1 wt%) the montmorillonite caused the apparent density decrease of foamed materials ca. 10%, however beneficially influenced on the quality of cells structure, giving the products with isotropic cells and the highest cell density as well as keeping the tensile strength on similar level as in the case of the materials with CB and ADC only. |
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| Keywords: | Poly(vinyl chloride) Composites Foaming process Microwave irradiation Thermal runaway Cellular structure |
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