{"title":"60Co-γ对单晶和多晶聚乙烯熔融行为的影响","authors":"S. Rafi Ahmad, A. Charlesby","doi":"10.1016/0020-7055(76)90026-7","DOIUrl":null,"url":null,"abstract":"<div><p>The effect of ionizing radiation on high density poly (HD) and single (SC) crystals of polyethylene samples were investigated by DSC. For HD material the heat of fusion (<em>ΔH</em><sub><em>f</em></sub>) was found to drop by only ∼ 17% at about 700 Mrad of radiation dose with no detectable corresponding change in the melting temperature <em>T</em><sub><em>m</em></sub>. In contrast approximately 67% drop in <em>ΔH</em><sub><em>f</em></sub> and 18 K in <em>T</em><sub><em>m</em></sub> was observed for SC specimen. Such drastic differences in the melting behaviour were ascribed to greater sensitivity of the SC material to irradiation as far as effecting the crystal structure is concerned. Crosslinking taking place in the fold surface of the SC specimen (amorphous region) increases the strain energy at the fold and progressively affects the nearby crystal lattices. The amorphous region in HD material is different in morphology, and crosslinking taking place in that region does not affect the crystal structure substantially.</p></div>","PeriodicalId":100688,"journal":{"name":"International Journal for Radiation Physics and Chemistry","volume":"8 5","pages":"Pages 585-588"},"PeriodicalIF":0.0000,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7055(76)90026-7","citationCount":"20","resultStr":"{\"title\":\"Effect of 60Co-γ on the melting behaviour of single and poly-crystalline polyethylene\",\"authors\":\"S. Rafi Ahmad, A. Charlesby\",\"doi\":\"10.1016/0020-7055(76)90026-7\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The effect of ionizing radiation on high density poly (HD) and single (SC) crystals of polyethylene samples were investigated by DSC. For HD material the heat of fusion (<em>ΔH</em><sub><em>f</em></sub>) was found to drop by only ∼ 17% at about 700 Mrad of radiation dose with no detectable corresponding change in the melting temperature <em>T</em><sub><em>m</em></sub>. In contrast approximately 67% drop in <em>ΔH</em><sub><em>f</em></sub> and 18 K in <em>T</em><sub><em>m</em></sub> was observed for SC specimen. Such drastic differences in the melting behaviour were ascribed to greater sensitivity of the SC material to irradiation as far as effecting the crystal structure is concerned. Crosslinking taking place in the fold surface of the SC specimen (amorphous region) increases the strain energy at the fold and progressively affects the nearby crystal lattices. The amorphous region in HD material is different in morphology, and crosslinking taking place in that region does not affect the crystal structure substantially.</p></div>\",\"PeriodicalId\":100688,\"journal\":{\"name\":\"International Journal for Radiation Physics and Chemistry\",\"volume\":\"8 5\",\"pages\":\"Pages 585-588\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1976-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0020-7055(76)90026-7\",\"citationCount\":\"20\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal for Radiation Physics and Chemistry\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/0020705576900267\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal for Radiation Physics and Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0020705576900267","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Effect of 60Co-γ on the melting behaviour of single and poly-crystalline polyethylene
The effect of ionizing radiation on high density poly (HD) and single (SC) crystals of polyethylene samples were investigated by DSC. For HD material the heat of fusion (ΔHf) was found to drop by only ∼ 17% at about 700 Mrad of radiation dose with no detectable corresponding change in the melting temperature Tm. In contrast approximately 67% drop in ΔHf and 18 K in Tm was observed for SC specimen. Such drastic differences in the melting behaviour were ascribed to greater sensitivity of the SC material to irradiation as far as effecting the crystal structure is concerned. Crosslinking taking place in the fold surface of the SC specimen (amorphous region) increases the strain energy at the fold and progressively affects the nearby crystal lattices. The amorphous region in HD material is different in morphology, and crosslinking taking place in that region does not affect the crystal structure substantially.
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