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https://ptsldigital.ukm.my/jspui/handle/123456789/500450| Title: | Curing behaviour, morphology and properties of PMMA-grafted natural rubber-toughened epoxy/clay nanocomposites |
| Authors: | Nor Yuliana Yuhana (P42582) |
| Supervisor: | Sahrim Ahmad,Prof. Haji |
| Keywords: | Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia Epoxy compounds Clay Nanostructured materials Polymeric composites Nanocomposites (Materials) |
| Issue Date: | 30-Aug-2012 |
| Description: | Curing behavior, morphology, and properties of ternary systems containing epoxy, PMMA grafted natural rubber and nanoclay were studied. Two types of nanoclay used were natural montmorillonite (Cloisite Na) and organic chemically modified montmorillonite (Cloisite 30B). The amount of nanoclay used were 2,5 and 7 phr, while the amount of rubber was fixed at 5 phr. Poly(etheramine) was used as the curing agent, and the effect of the equivalent and higher molar ratio, 1.05, of amine-epoxy were also studied. The materials prepared were cured unmodified epoxy, cured toughened epoxy, cured unmodified epoxy/clay nanocomposites, and cured toughened epoxy/clay nanocomposites. Mixing process was performed by mechanical stirring and ultrasonic treatment. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), infrared analysis (FTIR), differential scanning calorimetry (DSC),thermal gravimetric analysis (TGA), water vapor transmission test, flexural, and impact tests were performed. It was found that organoclay accelerates the curing process. The formation of amine salt in cured nanocomposites may assist the dispersion of unmodified clay in epoxy. The interlayer spacing of nanoclay, and rubber particles sizes were influenced by the nanoclay surface modification, nanoclay amount and molar ratio of amine-epoxy used. Generally, the addition of unmodified clay and organoclay, at increasing clay content, improved the thermal stability of binary and ternary nanocomposite systems. The excellent results for flexural and water vapor transmission analysis, were attained by using 2 and 5 phr unmodified clay in binary and ternary systems, respectively. The presence of 5 phr unmodified clay in epoxy-rubber blend has shown excellent flexural modulus, with about 128% increment and reduced the water vapor transmission rate by about 35%, as compared to the neat epoxy. The presence of plasticizers and voids in cured samples, however, reduced the impact strength and glass transition temperatures of cured samples,Certification of Master's/Doctoral Thesis" is not available |
| Pages: | 121 |
| Call Number: | QD383.E66N645 |
| Publisher: | UKM, Bangi |
| Appears in Collections: | Faculty of Science and Technology / Fakulti Sains dan Teknologi |
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| ukmvital_120142+SOURCE1+SOURCE1.0.PDF Restricted Access | 841.12 kB | Adobe PDF |  View/Open |
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