تهيه ذرات هسته-پوسته كربنات كلسيم/كوپليمر ﴿بوتيل آكريلات -متيل متاكريلات﴾ و اثر آنها بر روي خواص مكانيكي كامپوزيت هاي PVC

چكيده انگليسي :

Effect of Synthesized Micro and Nano CaCO3 Poly BA co MMA Cre Shell Particles on Mechanical Properties of PVC Composites Seyyd Hamid Sajjadi Jazi Sh sajadijazi@ce iut ac ir Date of Submission 2013 08 21 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree Ph D Language Farsi Supervisor M Nasr Esfahani mnasr@cc iut ac ir R Bagheri r bagheri@cc iut ac ir Abstract In this study the mechanical properties of composites of poly vinyl chloride PVC as one of the most important thermoplastic are investigated PVC has high mechanical strength high corrosion and chemical resistance and relatively low cost But it has weak impact resistance which limits its application in some areas The main object of this research is to improve interfacial interaction between the CaCO3 particles and the matrix for promotion of impact strength of the polymer At the start of this study a direct dry mixing of PVC and nano CaCO3 particles was found to be efficient using XRD and SEM In the next step the effect of surface treatment by MPTS and PMHS of CaCO3 on mechanical properties impact strength tensile strength elongation at break and Young modulus of PVC composite samples using various mass ratios of treated micro and nano CaCO3 particles was studied The appearance of the bands at 1041 5 and 1126 3 cm 1 was indicative of the formation of Si O CaCO3 bond on CaCO3 particles The maximum impact strength elongation at break tensile strength and Young s modulus were obtained at 9 6 mass ratio of micro nano CaCO3 in the PVC matrix SEM images of fractured surfaces of tensile test revealed fibrils Agglomeration of particles was observed with increase in content of micro CaCO3 particles resulting in lower mechanical properties In the continuation of this study The treated particles of CaCO3 were encapsulated by poly butyl acrylate co methyl methacrylate through in situ emulsion copolymerization using different mole ratios of butylacrylate BA merthyl methacrylate MMA FTIR spectra of the extracted synthesised samples showed chemical grafting between the treated particles and the polymer through C S bonding at wavenumber 754 1 cm 1 Polymerization conversion and binding efficiency of core shell particles were over 92 and 94 respectively TEM revealed that in the core shell structure the particle size for nano and micro was 72 87 and 175 192 nm respectively The synthesized core shell particles were melt blended with PVC using a constant content of micro and nano core shell particles 15 phr The mechanical properties showed that impact strengths of PVC with micro and nano core shell particles were 3 3 and 18 times more than pure PVC respectively Tensile strength and elongation at break showed a very slightly decrease and significantly increase respectively SEM of fractured surfaces of impact test showed a relatively smooth and featureless surface for low mole ration of BA MMA and for the high mole ratio of BA MMA monomers the morphology of PVC core shell composites looked like a honeycomb structure and a large number of fibrils and voids were presented on the surface of impact test specimens The fractured surfaces of tensile test revealed that the high mole ratio of BA MMA monomers in core shell particles induced shear bands and the low mole ratio of BA MMA induced crazes in PVC nano CaCO3 poly BA co MMA composites According to Molau test interfacial interaction between PVC and core shell particles was enhanced FTIR spectra of pure PVC and PVC nano CaCO3 acrylic resin composites illustrated hydrogen bonding interaction between carbonyl groups C O of the resin and hydrogen of CHCl groups of PVC chains Keywords PVC Calcium Carbonate Micro and Nano Particles Core Shell Particles Mechanical Properties PDF created with pdfFactory trial version www pdffactory com

سجادي جزي، حميد

تهيه ذرات هسته-پوسته كربنات كلسيم/كوپليمر ﴿بوتيل آكريلات -متيل متاكريلات﴾ و اثر آنها بر روي خواص مكانيكي كامپوزيت هاي PVC

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