游離輻射電子束照射劑量對交聯發泡聚乙烯之物性影響

Effect of Irradiation Electron Beam on Physic Properties of Cross-linking Foamed Polyethylene

李進祿(Chin Lu Lee)

指導教授 ： 陳適範

國立臺北科技大學/工程學院/材料及資源工程系研究所/碩士(2014年)

https://doi.org/10.6841/NTUT.2014.00428

摘要

在本篇論文中先是了解聚合物依其對熱的性質不同，有熱塑性聚合物、熱固性聚合物、發泡塑膠有質輕、比強度高、緩衝能力、隔熱性好之優點，發泡，依比重可分高發泡倍率(比重小於0.1)、中發泡倍率(比重介於0.1-0.4)、低發泡倍率(比重大於0.4) 。以交聯架橋聚乙烯達30倍發泡配方為基礎，測試經不同劑量電子輻射照射後，其試片自外觀、氣泡大小，至架橋度測試、延伸率測試、及抗拉強度測試的影響，輻射照射劑量4.8~5.4M rad，均可得到30倍之目標發泡倍率，由架橋度測試顯示，在4.8~5.4M rad之照射劑量內，劑量對架橋度之變化率約為2.05(%) / 0.1M rad，成品外觀以照射劑量4.8~5.2M rad較佳，5.4M rad則有較多大氣泡，且厚度變化大於其他劑量值，物性方面，照射劑量對撕裂強度無明顯影響，劑量愈高抗拉強度愈強，延伸率則以5.0M rad最佳，超過5.0M rad後延伸率又下降。
綜合外觀及物性結果顯示，以輻射電子照射劑量5.2 M rad為30倍交聯發泡聚乙烯發泡之最佳劑量。

關鍵字

發泡塑膠 ； 游離輻射 ； 交聯發泡

並列摘要

The polyethylene foams were used in many applications in the industry. The effects on physical property of cross-linking foamed polyethylene by irradiation
electron beam are studied in this thesis. The polyethylene was induced with cross-linking process by irradiation of electron beam to improve its stableness against heat because it requires not using additives nor does it generate hazardous chemical by-products.
In the experiment four parts of samples were irradiated with 4.8M rad 5.0 M rad 5.2 M rad and 5.4M rad electrons. The basic form of formula of sample was low density polyethylene (LDPE) pellet. CNS10487 and JIS K6767 standards were used to evaluate the experiment process. We found that5.4MRad radiated samples increased in thickness than others. 5.2M rad radiated samples were better than 4.8 M rad, 5.0 M rad radiated samples in tensile strength. There were no relationships about samples in tearing strength. But 5.0 M rad sample got most elongation rate. We still focused on the 5.2
M rad radiated sample.
According to the result of experiment, samples with 5.2M rad irradiated electrons will perform better in physical properties.

並列關鍵字

cross-linking process ； irradiation ； polyethylene ； M rad.

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“Composite patterning in immiscible alloys subjected to severe plastic deformation“Journal of Materials Research ,volue 28 No 19