Effect of Preliminary Heating of a Polymeric Polytetrafluoroethylene Target on its Ablation by a Continuous CO2 Laser

被引：6

作者：

Tolstopyatov, E. M. ^{[1
]}

Grakovich, P. N. ^{[1
]}

Ivanov, L. F. ^{[1
]}

Allayarov, S. R. ^{[2
,3
]}

Olkhov, Yu. A. ^{[2
]}

Dixon, D. A. ^{[3
]}

机构：

[1] Natl Acad Sci Belarus, VA Belyi Met Polymer Res Inst, Gomel 246050, BELARUS

[2] Russian Acad Sci, Inst Problems Chem Phys, Chernogolovka 142432, Moscow Region, Russia

[3] Univ Alabama, Dept Chem, Tuscaloosa, AL 35487 USA

来源：

JOURNAL OF RUSSIAN LASER RESEARCH | 2015年 / 36卷 / 05期

关键词：

polytetrafluoroethylene; molecular-topologic structure; laser ablation; continuous CO2 laser; DSC; TGA; polymeric target; MOLECULAR-MASS DISTRIBUTION; THERMOMECHANICAL PROPERTIES; LASER DEPOSITION; RADIATION; TEMPERATURE;

D O I：

10.1007/s10946-015-9527-7

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study experimentally the effect of pre-heating polytetrafluoroethylene (PTFE) on its laser ablation rate from a continuous wave CO2 laser. The ablation rate and the fraction of fiber formed grow significantly as the initial temperature of the polymeric target increases from 292 to 683 K. The ablation rate obeys two exponential dependences on the temperature with different apparent activation energies for the high-temperature and low-temperature regimes. We find that a crossover temperature of 460 K correlates best with the temperature for sol-gel transformation in the bulk. The faster rates at higher temperature are due to the ability of the reactive species generated in the ablation process to react with more of the system.

引用

页码：485 / 494

页数：10

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