The effect of residual free radicals on the properties of radiation crosslinked PVC (XLPVC)

Mingjun Wang; Ming Yin; Hekang Zhang

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The effect of residual free radicals on the properties of radiation crosslinked PVC (XLPVC)

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- The effect of residual free radicals on the properties of radiation crosslinked PVC (XLPVC)
- Nuclear Techniques Vol. 11, Issue 5, (1988)
- 作者机构：
  
  上海交通大学
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：16 January 1987，
  
  Published：1988-05
- 稿件说明：
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Mingjun Wang, Ming Yin, Hekang Zhang. The effect of residual free radicals on the properties of radiation crosslinked PVC (XLPVC)[J]. Nuclear techniques, 1988, 11(5): 41-47.
DOI：

Mingjun Wang, Ming Yin, Hekang Zhang. The effect of residual free radicals on the properties of radiation crosslinked PVC (XLPVC)[J]. Nuclear techniques, 1988, 11(5): 41-47. DOI：

摘要

PVC电线电缆料经辐照交联后，残存着很多自由基，在常温，甚至在120℃，这些自由基仍然保持稳定，消失很慢。然而，在XLPVC长期高温使用过程中这些自由基会进一步产生交联作用，使材料的性能发生变化，抗张强度增加，伸长率下降。XLPVC经136℃ 168h老化后，凝胶含量增加很多，并随着交联剂用量的增加，增加的百分率也变大。残存自由基的这种作用相当于PVC的交联率的增加，而使Rg下降。老化前后，溶胶分数与剂量的关系均可用

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来表述。

Abstract

Many free radicals remain in the materials of XLPVC-wire and cable. At room temperature

even at 120℃

they are still stable and disappear slowly. When XLPVC is aged at 136℃ for 168h

the radicals make it crosslink further so that some of its properties are changed

e. g. the tensile strength is increased and the extension ratio decreased. Besides

the gel fraction is highly increased

and the increased percentage rises with the addition of crosslinking agent. This effect of residual free radicals corresponds to the rise in crosslinking efficiency of PVC and makes the gelation dose decrease. Before or after XLPVC is aged

the relationship between the sol fraction and the: irradiation dose can be described by

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关键词

Keywords

references

A. Charlesby and S. H. Pinner , Proc. Roy. Soc ., A249 ( 1959 ) , 367 .

王铭钧和殷明，辐射研究与辐射工艺学报，待发表。

张万喜等，辐射研究与辐射工艺学报， 2 （ 1984 ） 4 ： 1 。

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