The Properties of Polymer Blends between Polylactic Acid and Epoxidized Natural Rubber Irradiated in the Rubber PhaseReport as inadecuate




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The objective of this work was to study the properties of new biodegradable packaging materials by radiation crosslinking in the rubber phase in a polylactic acid PLA-epoxidized natural rubber blend. As a result of increasing problems with regards to disposal of domestic waste, particularly plastics, a new class of polymer especially designed to be biodegradable, has been undergoing development. The mechanical properties indicated that the 90-10 composition of the PLA-ENR blend had the highest modulus, elongation at break and tensile strength compared to other blend compositions. This research will therefore employ this ratio to investigate the effect of pre-irradiation of epoxidized natural rubber on the properties of the poly lactic acid - epoxidized natural rubber blend. The impact strength of the polymer blend increases with an increased radiation dose irradiated into the rubber phase because the increase in the radiation dose leads to an increase in the crosslink density within the rubber phase. Moreover, the TGA thermograms of polymer blends without irradiation in the ENR phase are compared with pre-irradiation in the ENR phase. It could be concluded that at a particular temperature weight loss from irradiation in the ENR phase at 30 kGy is higher than from other radiation doses and also no radiation dose, indicating that no radiation provides more thermal stability. Thus it could be seen that degradation being the predominant process during irradiation causes the scission of the rubber chains and this chain scission is associated with the weight loss.

KEYWORDS

radiation, rubber, polylactic acid, biodegradable plastic

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Author: Tarinee Nampitch, Rathanawan Magaraphan

Source: http://www.scirp.org/



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