An experimental study of the photodegradation of polyoxymethylene at 122, 147 and 193 nm

Details An experimental study of the photodegradation of polyoxymethylene at 122, 147 and 193 nm An experimental study of the photodegradation of polyoxymethylene at 122, 147 and 193 nm

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jpcpb.135...53c&link_type=abstract

Journal of photochemistry and photobiology, 135, A: Chemistry, 53-64

Biology

Polyoxymethylene, Uv Irradiation, Photodegradation, Experimental Design, Quantum Yields, Comets

Scientific paper

This paper presents results from a current experimental program whose aim is to determine quantitatively the photochemical evolution of organic molecules present or likely to be present in comets. Particularly, this includes the mechanisms involved in the degradation of high molecular weight compounds in cometary ices and dust, when they are submitted to photon bombardment in the surrounding area of the sun. Photodegradation of polyoxymethylene (-CH2-O-)n is studied at 122, 147 and 193 nm. Experimental setup and analytical methods are presented (FTIR, GC-MS). We have identified the main gaseous photodegradation products of polyoxymethylene : H2CO, CO, HCOOH, CO2, CH3OH, CH3OCHO, CH3OCH3OCH3 and C3H6O3 (trioxane). We have determined the production quantum yields for formaldehyde (phi122nm = 0.75 +/- 0.21, phi147nm = 0.96 +/- 0.19) and formic acid (phi122nm = 0.13 +/- 0.05, phi147nm = 0.26 +/- 0.10), and roughly estimated the yields for the other compounds. Such data, that were missing to interpret astronomical observations of comets, are now available for further theoretical studies. We also propose mechanisms involved in the production of these molecules from polyoxymethylene.

Affiliated with

Also associated with

No associations

Rating

An experimental study of the photodegradation of polyoxymethylene at 122, 147 and 193 nm does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with An experimental study of the photodegradation of polyoxymethylene at 122, 147 and 193 nm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An experimental study of the photodegradation of polyoxymethylene at 122, 147 and 193 nm will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1350842