• Lalit Mohan Kukreja

      Articles written in Bulletin of Materials Science

    • Laser processing of polymers: an overview

      Lalit Mohan Kukreja

      More Details Abstract Fulltext PDF

      A review of the author’s work on laser processing of polymers and others’ work on photo-etching in polymers is presented. Processes based on laser-induced volatile decomposition like cutting, engraving, etc. are investigated in thermoset and thermopolymers using a continuous wave CO2 laser. Dependence of geometrical parameters and gross thermal effects on parameters of the laser beam for these processes are discussed. It is shown that a highly combustible polymer like cellulose nitrate can be processed with a CO2 laser in air because of the faster kinetics of the volatile decomposition than that of the combustion. It is found that irreversible surface softening can be achieved in a thermoset polymer of allyl diglycol carbonate by treating it with a CO2 laser. Basic parametric relations of this phenomenon are established. Mechanism of laser softening in the surface of a thermoset polymer is discussed. Finally, the process of fine etching based on photodecomposition in polymers is presented and various theories proposed to explain this phenomenon are discussed in brief.

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