Mani, R. ; Singh, R. P. ; Sivaram, S. ; Lacoste, J. (1994) Effect of UV irradiation on the structure of heterophasic ethylene-propylene copolymers Polymer Journal, 26 (10). pp. 1132-1141. ISSN 0032-3896
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Official URL: http://www.jstage.jst.go.jp/article/polymj/26/10/2...
Related URL: http://dx.doi.org/10.1295/polymj.26.1132
Abstract
Changes in [η] and crystallinity of commercial samples of isotactic polypropylene (i-PP), heterophasic ethylene–propylene copolymers [E–P copolymer] containing <16 mol% of ethylene and their fractions (having ethylene content 40.9 and 55.7 mol%) upon polychromatic irradiation in air at 55°C were studied by comparing unirradiated samples. Crystallinity was evaluated by DSC and X-ray diffraction. Viscosity results showed a decrease of molecular weight upon irradiation. DSC and X-ray studies revealed that the transition of α-modification to β-phase of polypropylene and also that crystallinity of the copolymer decreased initially upon irradiation. However, upon longer irradiation, the crystallinity increased again.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Japan Science and Technology Information Aggregator, Electronic. |
| ID Code: | 70121 |
| Deposited On: | 18 Nov 2011 12:56 |
| Last Modified: | 18 Nov 2011 12:56 |
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