35MeV/uAr离子辐照聚酯膜引起的效应研究

Study of Effects in Polyethylene Terephthalate Films Induced by 35 MeV/u Ar Ion Irradiation

采用多种手段研究了 35Me V/u的 Ar离子辐照聚酯 (PET)膜产生的微观结构变化 .结果表明 ,辐照使聚酯的化学键断裂并产生了炔端不饱和基团和自由基 .断键主要发生在乙二醇残留物、苯环的对位和酯的 C— O键上 .随着吸收剂量的增加 ,材料的结晶度逐渐降低 ,由原始的41 .7%减至最高辐照量时的 1 5.0 % .研究发现 ,聚脂的非晶化转变截面与电子能损呈线性关系 ;断键和非晶化效应主要取决于样品的吸收剂量 ,并存在一个约 4.0

Stacked polyethylene terephthalate films were irradiated with 35 MeV/u Ar ions at room temperature. The ion induced effects were studied by ultraviolet visible spectrometer, Fourier transform infrared spectroscopy, X ray diffractometer, X ray photoelectron spectroscopy, electron spin resonance spectroscopy and differential scanning calorimetry. Bond breaking and the formation of alkyne end groups and free radicals were observed. The bond breaking processes occurred mainly at the ethylene glycol residue of the trans configuration, C—O bond of ester and at the para position of benzene rings. The benzene ring structure is found to be more stable under irradiation. With increasing absorbed dose the crystallinity of the material was gradually decreased from 41.7% of the virgin material to about 15% at the highest dose. The cross section for amorphous transformation shows linear dependence on the mean electronic energy loss. It is found that the induced effects depend mainly on the absorbed dose. A threshold of about 4.0 MGy is determined for all the observed effects.