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Crosslinking of Low-Density Polyethylene by Diisocyanates for Superior Barrier Properties

Baldev, Raj and Jagadish, R. S. and Srinivas, P. and Mr., Siddaramaiah (2005) Crosslinking of Low-Density Polyethylene by Diisocyanates for Superior Barrier Properties. Journal of Applied Polymer Science, 96. pp. 1193-1199.

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The chemical modification of low-density polyethylene (LDPE) resins with hexamethylene diisocyanate and toluene diisocyanate was achieved. The reaction of LDPE with diisocyanate was monitored by Fourier transform infrared spectroscopy, wherein the appearance of new peaks at 3326, 1620, and 1572 cm1 corresponding to ONOH stretching,O(CAO)ONH2 stretching, and ONOH bending in an amide moiety, respectively, was observed. Modified films of excellent clarity and uniform thickness were obtained by the solution casting of crosslinked polyethylene. The oxygen transmission rate (OTR), water vapor transmission rate (WVTR), grease resistance, and thermal properties of the modified films were studied. The results clearly indicate that the OTR was improved by 35% and that grease resistance was improved by 90–125% in the crosslinked LDPE films with little change in their strengths. The heat seal characteristics, however, showed that relatively higher temperatures were needed to achieve efficient sealing in these films. Differential scanning calorimetry showed a decrease in the melting temperature from 104°C for LDPE to 101°C for both of the crosslinked LDPE films.

Item Type: Article
Uncontrolled Keywords: polyethylene (PE) crosslinking FT-IR
Subjects: 500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 27 Polymer Chemistry
600 Technology > 05 Chemical engineering > 08 Plastics Technology
Divisions: Food Packaging Technology
Plantation Products Spices and Flavour Technology
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 21 Jun 2007 10:14
Last Modified: 03 Jul 2015 11:55
URI: http://ir.cftri.com/id/eprint/1216

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