采用多种手段研究了35 MeV/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15.0%．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 MGy的阈值．
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.
参考文献
| [1] | Papalio R M, Araujo M A, Livi R P. Study of the Ion Induced Amorphisation, Bond Breaking and Optical Gap Change Processes in PET [J]. Nucl Instru ＆Meth, 1992, B65:442－446. |
| [2] | 李长林,孙友梅,刘刚等.离子辐照聚合物薄膜引起的降解和能量传输过程[J].核技术,1996,19(1):13－17. |
| [3] | Balanzat E, Buffard S, Moel A La et al. Physico-chemical Modifications Induced in Polymers by Swift Heavy Ions [J].Nucl Instru ＆Meth,1994,B91:140－145. |
| [4] | Steckenrester T,Fuesa H,Stamm M et al. Solvent-induced Sensitization of Ion Tracks in PET Analyzed by Small-angle X-ray attering and Differential Scanning Calorimetry [J].Nucl Instru Meth,1995,B105:200－203. |
| [5] | Ziegler J F, Biersack J P, Littmark U. The Stopping and Ranges of Ions in Solids [M]. Pergamon,New York,1985. |
| [6] | . 刘昌龙,朱智勇,金运范等.Ar离子辐照PET引起的表面结构和组分变化研究[J].核技术,2001,4:. |
| [7] | Liu C L, Jin Y F, Zhu Z Y et al. Molecular Conformation Changes of PET Films under High Energy Ar Ion Bombard ment[J]. Nucl Instru ＆ Meth,2000,B169:72-77. |
| [8] | Chapiro A. Chemical Modifications in Irradiated Polymers [J]. Nucl Instru ＆ Meth, 1988, B32: 111-114. |
| [9] | 刘昌龙,金运范,朱智勇等.高能Ae离子辐照PET引起的光吸收变化研究[J].高能物理与核物理,2000,24(7)：685-690. |
| [10] | Colthup N B, Daly L H, Wieberley S E. Infrared and Raman Spectroscopy [M]. New York: Academic Press, 1990, 265. |
| [11] | Papaleo R M, Hallen A, Sundqvist B et al. Chemical Damage in Poly(phenylene sulphide) from Fast Ions: Dependence on the primary-ion stopping power[J]. Phys Rev, 1996, B53:2 303-2 313. |
| [12] | Flory P J. Principles of Polymer Chemistry[M]. New York:Cornell Univesity Press, 1953, 570. |
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