| || Photo-induced Structural Changes in Polyolefin-nanoclay Composite
Author : Chauhan, R.S.;Singh, Anand;Shrivastava, Anchal Roy;Singh, Lokendra;Pant, S.C.
Source : Defence Science Journal ; Vol:58(6) ; 2008 ; pp 778-784
Subject : 620.1 Material Science and Technology
Keywords : Photodegradation;Polyethylene;Polypropylene;Nanoclay;Composite;Structural changes;Raman spectroscopy;Scanning electron microscopy
Abstract : The morphology of films prepared by melt-blending polyethylene (PE) and polypropylene (PP) with and without nanoclay was investigated after exposure to outdoor solar radiations for 45 days utilising many techniques. The Raman spectra revealed decreased intensity for all the characteristic Raman bands for PP and PE. The Fourier transform infrared spectroscopy showed formation of hydroxyl/hydroperoxy and carbonyl groups in the exposed samples. The weathered films after 45 days of solar exposure became brittle as indicated by loss in physical properties and the stress-strain curves. The clay-containing films showed higher strength loss after solar exposure. The fractured ends of the exposed films showed flat, smooth, and sharp surfaces, indicative of brittle fracture, compared to the unexposed sample.
| || Structure of Polyethylene Prepared Between Non Metallic Electrodes
Author : Bhawalkar, D.R.;Mall, R.P.;Chaudhary, K.L.;Upadhyay, S.N.
Source : Defence Science Journal ; Vol:27(2) ; 1977 ; pp 63-66
Subject : 620.1 Material Science and Technology;678 Composite Materials
Keywords : X Ray diffraction;Perspex electrodes;Polyethylene
Abstract : The X-Ray diffraction method has been applied to study the structural changes that polyethylene may undergo when prepared between glass and perspex electrodes at different temperatures. The results indicate that polyethylene does not undergo any considerable structural change under the prevailing conditions.
| || Identification of polythene(polyethylene)
Author : Datta Gupta, B.K.
Source : Defence Science Journal ; Vol:12(1) ; 1962 ; pp 91-93
Subject : 54 Chemistry;547 Organic Chemistry
Keywords : Polythene ;Polyethylene
Abstract : This note describes an observation which can be advantageously used for detection or identification of polythene in a laboratory where facilities for ultraviolet or infra-red spectroscopy do not exist.