Thermal degradation of polymers. Part I. Thermogravimetric and differential thermal analysis studies of atactic poly‐m‐aminostyrene and related polymers

Abstract

SynopsisThermogravimetric and differential thermal analysis have been employed to study the thermal degradation patterns of poly-m-aminostyrenes and poly-m-acetamidostyrenes of different molecular weights and also the corresponding 2: 1 copolymers with styrene. The thermal degradation routes have also been compared and contrasted with that of polystyrene. Experiments have been carried out in static air and dynamic nitrogen, and the different behavior exhibited by these polymers has been reconciled in terms of their differing structures and different mechanisms for pyrolytic degradation.

Thermal degradation of polymers. Part III. Vacuum pyrolysis of poly(m‐aminostyrene); the products volatile at pyrolysis temperature which are liquid or gaseous at room temperature

“…The system used is shown diagmmmnticnlly in IGg. 1 and is basically similar to that used by Madorsliy and co-worl:ers3 for the pyrolysis of polymers at high tempernturcs.…”

“…1 and is basically similar to that used by Madorsliy and co-worl:ers3 for the pyrolysis of polymers at high tempernturcs. Q was a quartz tube (length G l cm, external diameter 2.6 cm), which was attached by a quickfit joint to a detachable trap A1.…”

Thermal degradation of polymers. II further thermogravimetric and differential thermal analysis studies of atactic poly(m‐aminostyrene) homopolymers, copolymers, and related polymers

“…The pyrolysis of poly(m-aminostyrene) in vacuo is in the course of study, and results so far obtained indicate that molecular weight has no significant effect on the degradation, as would be expected. The products of pyrolysis may be divided into four distinct fractions: (1) a gaseous fraction consisting of carbon dioxide, propane, propylene, methane, and ethane, (2) a liquid fraction containing mainly m-aminostyrene and m-toluidine together with traces of m-ethylaniline, aniline, and a-methyl-m-aminostyrene, STILL, JONES, MANSELI, TEMPERATURE "C. (3) a gum, volatile a t pyrolysis temperature but involatile a t room temperature, consisting of dimer and trimer, and (4) a crosslinked residue.…”

Thermal analysis

“…Newkirk and Simons (310) have pointed out that the designation of peak temperatures of derivative TGA curves is incorrect. Use of various atmospheres for differentiation of thermal activity is well known and has been exemplified by polymer degradation studies in 02 and Ñ2 (400) and, in the inorganic field, by a study (258) of the decomposition of FeC204-2H20 in N2 and C02. Isothermal oxidation studies have been made as a function of 02 partial pressure (399).…”

“…Knox (210) has applied the same technique to measure the rate of crystallization of polypropylene. Fusion studies have been conducted with polyethylene (17) and polyoxymethylene (454) • Applications to thermal stability have involved polypropylene (376), poly-7ro-aminostyrene (400), polyhydrazides (140), polyaryl ethers (165), and aromatic copolyamides (108). Dollimore and Heal (110) have applied TGA and DTA to the study of carbonization of several polymers in inert atmospheres.…”