000			01730 am a22001933u 4500
042			_adc
100	1	0	_aStraus, Sidney _eauthor _9407
700	1	0	_aMadorsky, Samuel L. _eauthor _9408
245	0	0	_aPyrolysis of Some Polyvinyl Polymers at Temperatures Up to 1,200 °C
260			_bNational Institute of Standards and Technology, _c1962.
500			_a/pmc/articles/PMC6696540/
520			_aA study was made of the thermal behavior in a vacuum of polystyrene, polytetraflu-oroethylene, poly(α-methylstyrene), polypropylene, polyisobutylene, and poly(methylmethacrylate), when pyrolized at 500, 800, and 1,200 °C. The volatile products of degradation were collected and fractionated, and the fractions analyzed by mass-spectrometric and microcryoscopic methods. Generally, the results from 500 °C pyrolysis resemble those obtained previously from the same polymer at lower temperatures. The results at 800° and 1,200° indicate a much greater fragmentation of the pyrolysis products than at lower temperatures. Thus, for example, at 1,200° polystyrene yields less monomer but considerable greater amounts of C(2)H(2), C(2)H(4), C(3)H(4), and C(6)H(6) than at lower temperatures. Similarly, poly (α-methylstyrene) yields 100 percent monomer below 500 °C, but at 800 and 1,200 °C the yields are 88 percent and 34 percent, respectively. Also at the higher temperatures, pronounced amounts of H(2), CH(4), C(2)H(2), C(2)H(4), C(3)H(4), C(3)H(6), C(4)H(4), C(6)H(6), C(4)H(8), and C(8)H(8) are formed.
540			_a
546			_aen
690			_aPhysics and Chemistry
655	7		_aText _2local
786	0		_nJ Res Natl Bur Stand A Phys Chem
856	4	1	_uhttp://dx.doi.org/10.6028/jres.066A.041 _zConnect to this object online.
999			_c621 _d621