Effect of gamma irradiation on high temperature hardness of low-density polyethylene
Effect of gamma irradiation on high temperature hardness of low-density polyethylene
复制标题
DOI：
10.1080/14786435.2015.1088664
复制
发表时间：
2015-11-02
影响因子：
1.6
通讯作者：
Lee, Sanboh
中科院分区：
文献类型：
--
作者：
Chen, Pei-Yun;Yang, Fuqian;Lee, Sanboh
伽马辐照能引起聚合物微观结构和分子结构的改变，从而引起聚合物力学性能的改变。通过硬度测量，研究了辐照对低密度聚乙烯（LDPE）高温硬度的影响。辐照引起LDPE熔点、熔合焓和结晶度的升高。辐照LDPE的维氏硬度随辐照剂量、退火温度和退火时间的增加而增大。控制缺陷间反应的速率过程活化能随辐照剂量线性降低。由于LDPE是半结晶的，因此控制其硬度演变的过程是吸热的。
Gamma irradiation can cause the change of microstructure and molecular structure of polymer, resulting in the change of mechanical properties of polymers. Using the hardness measurement, the effect of gamma irradiation on the high temperature hardness of low-density polyethylene (LDPE) was investigated. The gamma irradiation caused the increase in the melting point, the enthalpy of fusion, and the portion of crystallinity of LDPE. The Vickers hardness of the irradiated LDPE increases with increasing the irradiation dose, annealing temperature, and annealing time. The activation energy for the rate process controlling the reaction between defects linearly decreases with the irradiation dose. The process controlling the hardness evolution in LDPE is endothermic because LDPE is semi-crystalline.