Thermal conductivity of high strength polyethylene fiber in low temperature
Thermal conductivity of high strength polyethylene fiber in low temperature
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DOI：
10.1002/polb.20428
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发表时间：
2005-06
期刊：
影响因子：
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通讯作者：
A. Yamanaka;H. Fujishiro;T. Kashima;T. Kitagawa;K. Ema;Y. Izumi;M. Ikebe;S. Nishijima
中科院分区：
文献类型：
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作者：
A. Yamanaka;H. Fujishiro;T. Kashima;T. Kitagawa;K. Ema;Y. Izumi;M. Ikebe;S. Nishijima
作为低温用纤维增强塑料增强材料的高强度聚乙烯纤维(TOYOBO、Dyneema®纤维，以下简称DF)具有较高的导热系数。为了解DF的导热性能，研究了不同模数的几种聚乙烯纤维(以下简称DFS)的结构与导热系数之间的关系。将由晶体和非晶组成的力学串并联模型应用于DFS的导热性能研究。该力学模型是通过固体核磁共振和X-射线衍射仪测量结晶度和晶体取向角得到的。纤维方向的导热系数主要由连续晶区的导热系数决定。力学模型估算的连续结晶部分的导热系数随温度的升高从16 mW/cmK增加到900 mW/cmK，连续结晶部分的热扩散系数约为100mm2/S，几乎与温度无关。由热扩散系数得到的DF连续晶区的声子平均自由程几乎与温度无关，其值约为200A。据此，由晶区和非晶区组成的力学串并联模型可以应用于DFS的导热性能。©2005威利期刊公司J Polym Sci第B部分：Polym Phys 43：1495-1503,2005
High strength polyethylene fiber (Toyobo, Dyneema® fiber, hereinafter abbreviated to DF) used as reinforcement of fiber-reinforced plastics for cryogenic use has a high thermal conductivity. To understand the thermal conductivity of DF, the relation between fiber structure and thermal conductivity of several kinds of polyethylene fibers having different modulus from 15 to 134 GPa (hereinafter abbreviated to DFs) was investigated. The mechanical series-parallel model composed of crystal and amorphous was applied to DFs for thermal conductivity. This mechanical model was obtained by crystallinity and crystal orientation angle measured by solid state NMR and X-ray. Thermal conductivity of DF in fiber direction was dominated by that of the continuous crystal region. The thermal conductivity of the continuous crystal part estimated by the mechanical model increases from 16 to 900 mw/cmK by the increasing temperature from 10 to 150K, and thermal diffusivity of the continuous crystal part was estimated to about 100 mm2/s, which is almost temperature independent. The phonon mean free path of the continuous crystal region of DF obtained by thermal diffusivity is almost temperature independent and its value about 200 A. With the aforementioned, the mechanical series-parallel model composed of crystal and amorphous regions could be applied to DFs for thermal conductivity. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 1495–1503, 2005