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    188宝金博页面版: Quantum yield of photolytic degradation of poly(l-butene)

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    内容提示： Polymer Bulletin 5, 443-450 (1981) Polymer Bulletin ?9 Springer-Verlag 1981 Quantum Yield of Photolytic Degradation of Poly(I-Butene) R.P. Singh Polymer Chemistry Division, National Chemical Laboratory, Pune-411008, India ABSTBACT Thin films of isotatic poly(l-butene) irradiated with a monochromatic light of 253.7 nm undergo random chaln-scission in air in the temperature range of 267.0-313.0 OK. Quantum yields in the absence and presence of different stabilizers have been determined using a potassium ferr...

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    Polymer Bulletin 5, 443-450 (1981) Polymer Bulletin ?9 Springer-Verlag 1981 Quantum Yield of Photolytic Degradation of Poly(I-Butene) R.P. Singh Polymer Chemistry Division, National Chemical Laboratory, Pune-411008, India ABSTBACT Thin films of isotatic poly(l-butene) irradiated with a monochromatic light of 253.7 nm undergo random chaln-scission in air in the temperature range of 267.0-313.0 OK. Quantum yields in the absence and presence of different stabilizers have been determined using a potassium ferrioxalate actinometer from 0.0188 to 0.00027 scissions per absorbed photon. Quantum yields for scission were independent of intensity. Light scattering technique was used to determine the rate of links breaking for polymeric systems. A saturation limit in photostabilization of isotatic poly(l-butene) by the stabilizers was achieved beyond 0.8, 0.7, 0.6 and 0.~ wt.% of copper(If) bis(1,3-diphenyltriazine-N-oxlde) [CPTO], 1.3-diphenyltriazine-N-oxide) [Hp~0], orphen~nthrollne b~s(1,3-diphenyltriazine-N-oxide~cobalt(II) [~PiT0J ana 2,4-diphenyl-6-(2'-hydroxyphenyl)-s-triazine LPHPT], respectively in the matrix of polymer film. INTRODUCTION The photolytic degradation of polyolefins in the Solid state has been studied quantitatively for only a few materials at temperatures where thermal degradation is not a significant process. Degradation and stabilization process in the presence of atmospheric oxygen have received less attention. The quantum yield measurements can be used to determine the rate of polymer bond rupture and the absorption rate of the initiation energy. Quantum yields for chain scission have been reported for poly(a-methyl- styrene) by STOKES et al.L(1962), poly(methyl Isopropyl- ketone) by WISSBRUN (1959) and for butyl rubber by BHATNAGAR et a1.(1977) and CHAND~ et a1.(1979) but little attention has been paid to isotatic poly(1-butene). In the present paper, we have reported the quantitative estimation of the quantum yields for the chain scission using a potassium ferri-oxalate actinometer. PAREER (19~3) used this actinometer over the commonly used uranyl oxalate actinometer on the grounds that it is more sensitive and c>nvenient at the longer wavelengths. 0170-0839/81/0005/0443/$01.60

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