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Title: Synthesis and characterisation of thermoplastic ionomers based on natural rubber
Researcher: Xavier, Thommachan
Guide(s): Kurian, Thomas
Keywords: Rubber Technology
Polymer Science
Natural rubber
Upload Date: 20-Apr-2012
University: Cochin University of Science and Technology
Completed Date: 22/03/2002
Abstract: Chemically modified novel thermo-reversible zinc sulphonated ionomers based on natural rubber (NR), radiation induced styrene grafted natural rubber (RI-SGNR), and chemically induced styrene grafted natural rubber (CI-SGNR) were synthesized using acetyl sulphate/zinc acetate reagent system. Evidence for the attachment of sulphonate groups has been furnished by FTIR spectra. which was supplanted by FTNMR results. Estimation of the zinc sulphonate group was done using spectroscopic techniques such as XRFS and ICPAES. The TGA results prove improvement in the therrno-oxidative stability of the modified natural rubber. Both DSC and DMTA studies show that the incorporation of the ionic groups affect the thermal transition of the base polymer. Retention of the improved physical properties of the novel ionomers even after three repeated cycles of mastication and molding at 120 QC may be considered as the evidence for the reprocessabiJity of the ionomer. Effect of both particulate (carbon black. silica & zinc stearate) and fibrous fillers (nylon & glass) on the properties of the radiation induced styrene grafted natural rubber ionomer has been evaluated. Incorporation of HAF carbon black results in maximum improvement in physical properties. Silica reinforces the backbone chain and weakens the ionic associations. Zinc stearate plays the dual role of reinforcement and ptasticization. The nylon and glass filled lonorner compounds show good improvement in the physical properties in comparison with the neat ionomer. Dispersion and adhesion of the fillers in the ionomer matrix has been amply supported by their SEM micrographs. Microwave probing of the electrical behavior of the 26.5 ZnSRISGNR ionomer reveals that the maximum relative complex conductivity and the complex permittivity appear at the frequency of 2.6 GHz. The complex conductivity of the base polymer increases from 1.8x 10.12 S/cm to 3.3xlO•4 S/cm. Influence of fillers on the dielectric constant and conductivity of the new ionic thermoplastic elastomer has been studied. The ionomer I nylon compound shows the highest microwave conductivity. Use of the 26.5 ZnS-RISGNR ionomer as a compatibilizer for obtaining the technologically compatible blends from the immiscible SBR/NBR system has been verified.
Pagination: 186p.
Appears in Departments:Department of Polymer Science & Rubber Technology

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01_title.pdfAttached File19.31 kBAdobe PDFView/Open
02_certificate.pdf30.13 kBAdobe PDFView/Open
03_declaration.pdf20.03 kBAdobe PDFView/Open
04_contents.pdf18.86 kBAdobe PDFView/Open
05_preface.pdf67.71 kBAdobe PDFView/Open
06_abstract.pdf40.59 kBAdobe PDFView/Open
07_chapter 1.pdf1.08 MBAdobe PDFView/Open
08_chapter 2.pdf656.45 kBAdobe PDFView/Open
09_chapter 3.pdf435.39 kBAdobe PDFView/Open
10_chapter 4.pdf580.81 kBAdobe PDFView/Open
11_chapter 5.pdf923.35 kBAdobe PDFView/Open
12_chapter 6.pdf554.72 kBAdobe PDFView/Open
13_chapter 7.pdf1.01 MBAdobe PDFView/Open
14_chapter 8.pdf139.94 kBAdobe PDFView/Open
15_future outlook.pdf30.7 kBAdobe PDFView/Open
16_abbreviations & glossary of symbols.pdf36.12 kBAdobe PDFView/Open
17_list of publications.pdf36.24 kBAdobe PDFView/Open

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