بررسي خواص مكانيكي و مقاومت نوري الياف پلي پروپيلن حاوي نانو ذرات اكسيد روي

چكيده انگليسي :

121 Study of Mechanical Properties and UV Resistance of Polypropylene ZnO Nanocomposite Fibers Zahra Karami z karami@tx iut ac ir September 2011 Department of Textile Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language Farsi Dr Mostafa Youssefi youssefi@cc iut ac ir Dr Sedigheh Borhani sborhani@cc iut ac irAbstractIn this thesis the structure and properties including photo degradation resistance of melt blended zincoxide propylene fibers were investigated For this purpose zinc oxide nanoparticles were melt blended withpolypropylene using a twin screw extruder Weight percentage of the nanoparticles was 0 1 and 2 and theweight ratio of the compatibliser to nanoparticles was 3 to 1 Fibers were produced by a melt spinningapparatus and then were drawn using a drawing machine up to the draw ratio of 3 8 The sample with 1 nanoparticle and 3 compatibiliser was drawn with different draw ratios of 2 3 and 3 8 Some of thesamples were exposed to ultraviolet radiation The structure and properties of the fibers before and afterradiation were investigated using different techniques such as mechanical analysis birefringencemeasurements Wide Angle X ray Diffraction WAXD Fourier Transform Infrared Spectroscopy FTIR FESEM and optical observations and thermogravimetry analysis TGA FESEM observations showed that for the samples with no compatibiliser nanoparticles were uniformlydistributed within the polypropylene fibers and no accomolation observed even in the sample with 1 nanoparticles some aggregation were observed In the samples which contained compatibiliser it seems thatthe accumulation of nanoparticles or groups of maleic anhydride Aggregation of nanoparticles wasincreased with increasing Zinc Oxide concentration from 1 to 2 Zinc Oxide nanoparticles up to 1 concentration had no effect on birefringence of polypropylene fibers In the sample which contained 2 ZincOxide nanoparticle the birefringence of polypropylene fibers was decreased in comparison to the othersamples Birefringence of samples containd 1 nanoparticles and 3 compatibiliser were increased withincreasing draw ratio TGA measurements showed that for compatibiliser contained samples with increasingzinc oxide nanoparticles to 1 have improved thermal stability and a higher temperature of initiation ofdegredation Results showed crystallinity breaking strength and modulus of the samples with 1 nanoparticle which does not contain compatibiliser increased 3 2 5 and 12 percentages respectively In thesamples which contain compatibiliser had lower mechanical properties for example the sample with 2 nanoparticles showed 22 6 and 18 1 decline in breaking strength and modulus respectively Therefore itis likely that the amount of compatibiliser used were higher than that required By increasing draw ratio fromo to 3 8 in the sample which contained 1 nanoparticles breaking strength modulus birefringence andcrystallinity were increased 79 1 50 9 62 4 and 25 7 respectively Results of photo degradation studies showed that zinc oxide nanoparticles generally improve photo degradation resistance of polypropylene fibers The samples that contained nanoparticles showed lowerreduction in mechanical properties lower changes in birefringence lower surface cracks and carbonyl groupsdue to the exposure to the ultraviolet radiation In this regard the difference between the samples contained0 5 and 1 percent of nanoparticles were not significant There was also no significant difference in thementioned properties between samples containing compatibiliser and samples without compatibiliser Thelight resistance of the samples containd 1 nanoparticles and 3 compatibiliser were increased withincreasing draw ratio Key WordsPolypropylene Zinc oxide Nanoparticle Photo degradation Nanocomposite

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بررسي خواص مكانيكي و مقاومت نوري الياف پلي پروپيلن حاوي نانو ذرات اكسيد روي

تخريب پليمرها , فناوري نانو , پرتوايكس