Poly (ethylene terephthalate) decomposition process in oxygen plasma; emission spectroscopic and surface analysis for oxygen–plasma reaction

Emission spectroscopy was applied to observe decomposed species of N-isopropylacrylamide (NIPAAm) exposed to He plasma, which was generated by AC discharge at the pressure of 400 Pa. As the NIPAAm monomer was exposed to He plasma, light emitted from the NIPAAm and plasma was monitored. In the diagnosis measurement, several emission peaks assigned to the H a and H b atomic lines, CH 3 O, CN(B 2 S-X 2 P), CH(A 2 D-X 2 P), and C 3 H 5 , CN, CHO, CH 2 O, and C 4 H 2 þ transitions were observed and measured at various discharge times. The present results show the presence of C 4 H 2 and C 4 H 2 þ *, which are not manifested in great concentration in the simulation of RF acetylene discharge. The time dependence of the emission intensities was also investigated. When the discharge time of He plasma was increased, the emission intensities of the observed transitions also increased and then gradually decreased.

Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

N‐isopropylacrylamide decomposition process in helium plasma

Martı́nez

Rodrı́guez-Lazcano

2006

“…The result come from the match of nitrogen emission with some emissions corresponding with oxygen or oxygen compounds, suggesting the reaction of this gas with the species formed from the polymer decomposition. We observed that some second positive system bands match with O 2 (314.5 and 406.4 nm), CO 2 1 , CHO, and NCO and the first negative line at 354.31 nm matches with O 2 . The match causes the superposition of the intensities.…”

Section: Resultssupporting

confidence: 58%

“…These ''hot'' compounds may undergo collisional stabilization under high-pressure reaction conditions. In this case o CH 2 À ÀCH 2 À ÀO o (C 1 , 3 A) can dissociate by breaking the CÀ ÀC bond as shown in R3, facing a barrier of 92 kJ/mol 22 or into CH 2 ( 1 A 1 ) 1 H 2 CO products (reaction R4) without exit barrier. This is one of the major possible primary product channels with experimental reaction enthalpy (D r H(0K)) of 223 and 229 kJ/mol obtained by quantum chemical calculations.…”

mentioning

confidence: 96%

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Emission spectroscopic analysis of poly(3‐octyl thiophene) exposed to plasmas

Rodrı́guez-Lazcano

Martı́nez

2007

Emission spectroscopy was employed to study reaction process of poly(3-octyl thiophene) (P3OT) exposed to helium, nitrogen, air and hydrogen plasmas. The plasma was generated by an AC discharge at a pressure of 2 3 10 22 Pa. The discharge power was maintained at an output of 220 V and a current of 0.2 A. The light emitted was monitored in the case of each plasma. Measurements at various discharge times were made of several emission peaks. The dominant emission bands were assigned to CH 2 at 589.32 nm, S 2 (B 3 S u 2 -X 3 S g 2 ) at 413.35 nm, CH 1 (A 1 P-X 1 S) at 422.51 nm and C 3 H 3 at 344.02 nm.These dominant emission bands indicate that the poly(3-octyl thiophene) was decomposed by plasma interaction. Nevertheless, the reaction between the polymer and nitrogen, hydrogen and air plasmas is more intense than that in the helium plasma. The possible reaction channels and formation mechanisms of some species produced are discussed.

Formation of conjugated carbon bonds on poly(vinyl chloride) films by microwave‐discharge oxygen‐plasma treatments

Kumagai

Tashiro

Kobayashi

2005

Self Cite

Conjugated polyene bonds on poly(vinyl chloride) (PVC) films were rapidly formed by the treatment of oxygen plasma produced by microwave discharge. Changes affecting the formation of conjugated carbon bonds on PVC were studied with respect to plasma emission diagnostic and surface properties of the film with fluorescence, refractant absorption spectroscopy, X-ray photoelectron spectroscopy analysis, and Raman spectroscopy. The formation of polyene bonds on the film surface was responsible for both the dechlorination and dehydrogenation of PVC in the plasma atmosphere.