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Showing papers in "Polymer Degradation and Stability in 1980"


Journal ArticleDOI
TL;DR: In this paper, the first order rate constants for pyrolysis are 3·7 × 10−4 sec−1 and 4·0 × 10 −4sec−1 for atactic and isotactic polypropylene at 388°C; the corresponding overall activation energies are 56 ± 6 and 51 ± 5 kcal mole−1.

82 citations


Journal ArticleDOI
M.L. Chu1
TL;DR: In this paper, the importance of oxygen uptake in the photo-ageing of polycarbonate was studied using a variety of uv light sources, including sunlight, and it was shown that photo-oxidation is a more important reaction pathway in poly-carbonate photo-aging than photo-Fries reaction.

82 citations


Journal ArticleDOI
TL;DR: In this paper, the degradation of poly(dimethyl/diphenyl siloxanes) are benzene and complex mixtures of cyclic oligomers which have been separated, identified and analysed.

81 citations


Journal ArticleDOI
TL;DR: In this paper, the key degradative processes for various polymers are itemised, together with photostabilisation mechanisms which can minimise these processes, and stabilisation is best effected by the use of uv absorbing additives or opaque pigments.

44 citations


Journal ArticleDOI
TL;DR: In this article, the authors studied the time, conversion and temperature dependence of carboxyl group formation and chain scission in low density polyethylene and found linear dependences both in function of time and conversion.

37 citations


Journal ArticleDOI
TL;DR: In this article, the thermal degradation of a highly chlorinated paraffin, (Cl 70% w/w), used as a fire retardant additive for polymers, has been studied by TG, DTA and TVA.

36 citations


Journal ArticleDOI
TL;DR: In this paper, the effect of various primary and secondary anti-oxidants and light stabiliser systems on the photo-stabilizing performance of a hindered piperidine compound bis[2,2,6,6-tetramethyl-4-piperidinyl]-sebacate in polypropylene film has been examined.

35 citations



Journal ArticleDOI
TL;DR: In this article, the authors compared the stabilisation mechanisms of dibutyltin maleate (DBTM) and dioctyltin bis(isooctyl thioglycollate) (DOTG) under conditions of thermal processing and photo-oxidation.

29 citations



Journal ArticleDOI
TL;DR: In this article, it was shown that the stable N -oxy radical generated during thermal processing catalytically oxidises phenolic antioxidants to their corresponding quinone forms, and the implications of this interaction, particularly with regard to its effect on light stability, are discussed.

Journal ArticleDOI
TL;DR: In this article, the effect of prior irradiation in an inert atmosphere on the subsequent photo-oxidative stabilities of polypropylene and low density polyethylene films has been examined using luminescence, infra-red and ultraviolet absorption techniques.

Journal ArticleDOI
TL;DR: In this paper, the curing and degradation behavior of poly(phenylene sulphide) (PPS) and poly(2-methyl phenylene sulphides) (PMPS) in air and nitrogen has been studied.

Journal ArticleDOI
TL;DR: In this paper, it was shown that 2,2,4-trimethyl-transdecahydroquinoline (trans-TDQ) is a better uv stabiliser than cis-TDq in polypropylene.

Journal ArticleDOI
TL;DR: In this article, the isomers 4-chloro-hex-2-ene and 2-chloroshex-3-ene of different compositions were prepared in order to study their reaction with organo-tin thioglycolate.

Journal ArticleDOI
TL;DR: In this paper, the activation energy of polystyrene degradation in a vacuum, in a N 2 flowing at 4 mm/s and in N 2 O 2 mixtures was investigated.

Journal ArticleDOI
TL;DR: In this paper, the synergism between a uv stabiliser (2-hydroxy-4-octoxybenzophenone (I)) and phenolic antioxidants has been studied during the photo-oxidation of polypropylene.

Journal ArticleDOI
TL;DR: In this paper, the degradation behavior of polystyrene and cis-1,4-polyisoprene when both are present in the same film as a 1:1 blend has been compared with that when the polymers are degraded separately.

Journal ArticleDOI
TL;DR: In this paper, the influence of prior thermally generated hydroperoxides and added benzophenone on the photo-stabilising action of a hindered piperidine compound, bis[2,2,6,6-tetramethyl-4-piperidinyl]-sebacate, was examined.

Journal ArticleDOI
TL;DR: In this paper, it was shown that in the case of two hindered phenol antioxidants (I R = H and II) products are formed which are considerably more effective than the phenols themselves.

Journal ArticleDOI
TL;DR: In this article, the changes in structure and composition which occur during processing of poly(vinylchloride) were dealt with by using coulometry and ir spectrophotometry.

Journal ArticleDOI
TL;DR: In this paper, it is proposed that γ-irradiation of polypeptides causes ionisation to give the polymeric radical cation, which undergoes chain fragmentation to produce an amino cation and an alkyl radical.

Journal ArticleDOI
TL;DR: In this paper, 3,5-Di-t-butyl-4-hydroxybenzyl mercaptan (BHBM) was chemically combined to polypropylene to the extent of 68% of the antioxidant present when films containing BHBM were exposed to uv irradiation.

Journal ArticleDOI
TL;DR: A study of the physical effects which occur on weathering of flame retarded polyesters is reported in this paper, where it is shown that halogenated flame retardant polyesters, whether the retardant is reacted into the backbone or added as an additive, weather more than non-halogenated systems.

Journal ArticleDOI
TL;DR: A hindered piperidine stabiliser, bis{2,2,6,6-tetramethyl-4-piperidinyl}-sebacate, has been found to inhibit the photo-sensitising effect of anthraquinone in polypropylene on flash photolysis in n -hexane solution transient formation due to the semi-quinone radical (AH·) at 370 nm and subsequent formation of the hydroquinone (9,10-dihydroxyanthracene (AH 2 ) were found to be effectively inhibited

Journal ArticleDOI
TL;DR: In this article, copolymers of methyl vinyl ketone and methyl isopropenyl ketone with methyl methacrylate (MMA) have been prepared covering the whole composition range.

Journal ArticleDOI
TL;DR: In this article, the grafting reaction was performed using a mutual gamma radiation technique in the presence of cupric chloride to inhibit homopolymerisation, and the possible advantages of ultraviolet stabilisation by graft co-polymerisation were discussed.

Journal ArticleDOI
TL;DR: In this paper, photo-initiated oxidation of poly(p-methylstyrene) has been studied at 25°C in chlorobenzene solution, initiating radicals being produced by the photolysis (λ = 313 nm) of AIBN.

Journal ArticleDOI
TL;DR: In this article, the rate of volatilisation and chain scission in copolymers of methyl methacrylate with maleic anhydride units was investigated. But the results were discussed from a mechanistic point of view.

Journal ArticleDOI
TL;DR: In this paper, a significant retardation effect by PbO on the formation of volatile products from isotactic polypropylene (IPP) was found at temperatures up to 380°C.