Abstract
Photoinitiated polymerization of methyl methacrylate has been observed using cw-CO2 laser radiation of (10.6 µm). Both of DSC and TGA thermal analysis techniques were used for identification of the thermal characteristics (Tg, Tc, and Tm) as well as the thermal stability of the laser photoinitiated PMMA and they compared with that corresponding to classical, conventionally initiated PMMA. In cw-CO2 laser radiation, each of powers (10, 15, and 20W) was used. Although a definite increase in Tg value and thermal stability were observed while power are (10W,15W and 20W), the polymerization pattern remained basically the same in all these cases. Multi-Photon absorption reaction phenomenon was attributed to elucidate the mechanism of interaction between the CO2 laser light and MMA monomer molecule.
Highlights
Methyl Methacrylate (MMA) [H2C=C (CH3) CO2CH3] is considered nowadays as the most important methacrylic acid ester commercially available, it is in particular used as a monomer for the fabrication of poly methyl methacrylate (PMMA)
First reason is especially connected with (CW) lasers, that the high intensities associated with laser radiation can, by increasing the transient concentration of radical intermediates, substantially increase the extent to which sequential absorption processes enter into the reaction
The IR spectra of [(MMA), and its polymer] are shown in Figures [(1, 2)] and the corresponding major band assignments are summarized in table (3)
Summary
Methyl Methacrylate (MMA) [H2C=C (CH3) CO2CH3] is considered nowadays as the most important methacrylic acid ester commercially available, it is in particular used as a monomer for the fabrication of poly methyl methacrylate (PMMA). Figures (3, 4, and 5) demonstrate DSC curves and Table (4) lists the associated values of thermal characteristics of (10 W CO2) laser initiated synthesized polymers.
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