Degradation of aromatic polymers—I. Rates of crosslinking and chain scission during thermal degradation of several soluble aromatic polymers

1989 ◽  
Vol 25 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Shin-ichi Kuroda ◽  
Koichiro Terauchi ◽  
Kyohei Nogami ◽  
Itaru Mita
Keyword(s):  
Thermal Degradation ◽  
Chain Scission ◽  
Aromatic Polymers

Degradation of Polymers

1962 ◽  
Vol 35 (5) ◽  
pp. 1157-1221 ◽  
Author(s):  
Leo A. Wall ◽  
Joseph H. Flynn
Keyword(s):  
Ionizing Radiation ◽  
Thermal Degradation ◽  
Natural Rubber ◽  
Ultraviolet Light ◽  
Recent Literature ◽  
Chain Scission ◽  
Experimental Results ◽  
Gel Formation ◽  
Vinyl Polymers ◽  
Kinetic Mechanisms

Abstract Recent literature pertaining to both the theoretical aspects and experimental results of the degradation of polymers by heat and radiation is reviewed and critically evaluated. Theories of random and chain thermal degradation of vinyl polymers and co-polymers are reviewed. The degradation of polymethacrylates, polyacrylates, poly-α-methylstyrene, polyolefins, polystyrene, other vinyl polymers, cellulose, polyesters, polyamides, dienes, natural rubber, and copolymers are discussed in the light of these theories. The thermodynamics and energetics of the degradation of these polymers is also reviewed. Chain scission, crosslinking, and gel formation and the kinetic mechanisms of these processes which take place during degradation of polymers by ionizing radiation and ultraviolet light are included. Degradative, rather than synthetic, effects are emphasized in the discussion.

Degradation of aromatic polymers—III. Crosslinking and chain scission during photodegradation of polysulphones

1989 ◽  
Vol 25 (6) ◽  
pp. 621-627 ◽  
Author(s):  
Shin-ichi Kuroda ◽  
Ayako Nagura ◽  
Kazuyuki Horie ◽  
Itaru Mita
Keyword(s):  
Chain Scission ◽  
Aromatic Polymers

scholarly journals The thermal degradation of some polymeric di-alkyl esters of itaconic acid

2013 ◽  
Vol 78 (12) ◽  
pp. 2179-2200 ◽  
Author(s):  
Ivanka Popovic ◽  
Lynne Katsikas
Keyword(s):  
Thermal Stability ◽  
Thermal Degradation ◽  
Itaconic Acid ◽  
Degradation Mechanism ◽  
General Structure ◽  
Chain Scission ◽  
Side Chain ◽  
Biotechnological Production ◽  
Methacrylate Monomers ◽  
Thermal Stability Of

One group of polymers that may help relieve the dependence on crude oil is based on itaconic acid, the biotechnological production of which has become feasible. Itaconic acid and its derivatives can easily be incorporated into polymers and may serve as a substitute for petrochemically derived acrylate or methacrylate monomers. The applications of polymers based on itaconic di-esters depend largely on their thermal stability. The thermal stability of poly(di-itaconates) is dependent, not only on the general structure of the monomer repeating unit, but also on the structure of the ester substituent. Depolymerization, initiated by b-scission or random main chain scission, is the dominant thermolysis mechanism in most cases. The depolymerization of poly-(di-itaconates) may be accompanied by de-esterification, elimination, cross-linking, random main or side chain scission and carbonization. Comparison of the thermal degradation mechanism of polymeric di-esters of itaconic acid to that of corresponding poly(methacrylates) confirms the viability of substituting poly(methacrylates) by poly(di-itaconates).

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