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  • Effect of crystallinity and irradiation on thermal properties and specific heat capacity of LDPE & LDPE/EVA.

Effect of crystallinity and irradiation on thermal properties and specific heat capacity of LDPE & LDPE/EVA.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine (2011-10-18)
Mahmoud Borhani zarandi, Hojjat Amrollahi Bioki, Zahra-alsadat Mirbagheri, Farshid Tabbakh, Ghazanfar Mirjalili
摘要

In this paper a series of low-density polyethylene (LDPE) blends with different percentages (10%, 20%, and 30%) of EVA and sets of low-density polyethylene sheets were prepared. This set consists of four subsets, which were made under different cooling methods: fast cooling in liquid nitrogen, cooling with cassette, exposing in open air, and cooling in oven, to investigate the crystallinity effects. All of the samples were irradiated with 10MeV electron-beam in the dose range of 0-250kGy using a Rhodotron accelerator system. The variation of thermal conductivity (k) and specific heat capacity (C(p)) of all of the samples were measured. We found that, for the absorption dose less than 150kGy, k of the LDPE samples at a prescribed temperature range decreased by increasing the amount of dose, but then the change is insignificant. With increasing the crystallinity, k of the LDPE samples increased, whereas C(p) of this material is decreased. In the case of LDPE/EVA blends, for the dose less than 150kGy, C(p) (at 40°C) and k (in average) decreased, but then the change is insignificant. With increasing the amount of additive (EVA), C(p) and k increased.

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Sigma-Aldrich
聚(乙烯-co-乙酸乙烯酯), vinyl acetate 40 wt. %, melt index (41-63 dg/min (190°C/2.16kg)), contains 190-910 ppm inhibitor
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Sigma-Aldrich
聚(乙烯-co-乙酸乙烯酯), vinyl acetate 12 wt. %, melt index 8 g/10 min (190°C/2.16kg)
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Sigma-Aldrich
聚(乙烯-co-乙酸乙烯酯), vinyl acetate 18 wt. %, melt index 8 g/10 min (190°C/2.16kg), contains 200-900 ppm BHT as inhibitor
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