The mechanism of the radiation‐induced crosslinking of polyolefins

Geymer, D. O.

doi:10.1002/macp.1967.021000120

Cited by 34 publications

(5 citation statements)

References 10 publications

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“…A direct proof that cross-linking is a radical reaction was obtained for polypropylene [102] where the reaction is very slow. Thus, by admitting a radical scavenger (methyl mercaptane) into polypropylene at room temperature immediately after irradiation at 77 K it was possible to completely prevent crossqinking.…”

Section: Cross-linkingmentioning

confidence: 96%

Radiation effects in polyethylene and n-alkanes

Ungar

1981

J Mater Sci

139

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The effect of high-energy radiation on n-alkanes and polyethylene (PE) are reviewed. The article includes a description of (a) primary radiation events, formation, spatial distribution and decay of free radicals and radical migration mechanisms, (b) formation of cross-lin ks and other sta ble products, (c) the effects of crystal linity, crystalline modifications and morphology on radiation cross-linking, and (d) radiation-induced changes in the crystal lattice and the destruction of crystallinity at high irradiation doses.An attempt is made to bring together conflicting views on various unsolved problems of the radiation physics and chemistry of these important and much studied substances. Long-chain paraffins are given considerable attention since their radiation behaviour often provides a link between that of PE and its short-chain analogues.

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Section: Cross-linkingmentioning

confidence: 96%

Radiation effects in polyethylene and n-alkanes

Ungar

1981

J Mater Sci

139

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“…Based on this, the behaviour of the mechanical properties -elongation at break and tensile strength -at low integral irradiation doses (10 kGy) can depend on several reasons: first, a slight cross-linking process which may be experienced by PP [9][10][11][12][13][14][15], and second the higher polymer-filler interaction resulting from PP hydrophilicity when it is irradiated, which, in turn, is the result of the functional OH groups [16]. In addition, the filler has high concentration of OH groups, which may be indicative of interactions of the hydrogen bridge type between the filler and PP.…”

Section: Resultsmentioning

confidence: 99%

Kinetic considerations on the mechanical behaviour of polypropylene + wood flour and polypropylene + sisal fibre blends

et al. 2004

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This work is aimed at analyzing by means of simple mathematical models the effect of different integral doses of γ-irradiation on the mechanical properties and concentration of radicals of the blends of polypropylene (PP) + wood flour and PP + sisal fibre. The analysis of the results permits inferring that the kinetic behaviour of the mechanical properties and the concentration of radicals at low integral doses (≤ 10 KGy) are indicative of a complex degradation process, implying the possibility of cross-linking and chain scission reactions both in the polymer as well as in the filler. Consequently, it can be concluded that cross-linking reactions are predominant. The behaviour observed at higher irradiation doses means that both reactions (cross-linking and chain scission) occur, the breaking reactions being the prevailing ones. This study of the kinetic analysis of the tensile properties is based on the behaviour detected for the melt-flow index.

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“…However, the studies on the radical effective crosslinking. [1][2][3] The presence of radical scavengers to suppress scissions to achieve more scavengers to suppress these scissions together effective crosslinking of PP have not satisfactorily with polyfunctional monomers to accelerate crossbeen reported to date, notwithstanding that they linkings is said to be preferable to achieve effecplay important roles in this technique. Although tive crosslinking.…”

Section: One Of the Most Important Problems In Crosslink-mentioning

confidence: 99%

Electron-induced crosslinking of polypropylene with the addition of hydrogen-donating hydrocarbons

Kubo

Otsuhata²,

Ikeda³

et al. 1997

J. Appl. Polym. Sci.

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Electron-induced crosslinking of polypropylene with the addition of hydrogen-donating hydrocarbons produced from petroleum (HHAP) together with A-TMPT (trimethylpropanetriacrylate) was studied, and the following results were obtained: (1) Effective crosslinking was achieved at lower doses under 10 kGy. (2) HHAP functions as an effective radical scavenger to suppress scissions. (3) Distinguished improvements in properties such as elongation and heat distortion temperature were achieved by the irradiation. (4) Distinct diminution in melt flow rate and evident increase in average molecular weight with the irradiation at lower doses were observed. (5) It was confirmed that the oxidative degradation during mixing and molding was noticeably inhibited by the addition of HHAP. This effect as an antioxidant during these procedures along with the irradiation seems to be a cause to promote crosslinks. These effects are attributable to the high radical scavenging effects of HHAP and its pure hydrocarbon constitution without functional groups containing heteroatoms.

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The mechanism of the radiation‐induced crosslinking of polyolefins

Cited by 34 publications

References 10 publications

Radiation effects in polyethylene and n-alkanes

Radiation effects in polyethylene and n-alkanes

Kinetic considerations on the mechanical behaviour of polypropylene + wood flour and polypropylene + sisal fibre blends

Electron-induced crosslinking of polypropylene with the addition of hydrogen-donating hydrocarbons

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