Preparation and Radiation Shielding Properties of Sandwich-structured Lead-containing Polyimide Materials

Jin Wang; Lin-lin Deng; Ling-xiang Guo; Bao-ping Lin; Hong Yang

doi:10.11777/j.issn1000-3304.2017.17121

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Preparation and Radiation Shielding Properties of Sandwich-structured Lead-containing Polyimide Materials

Research Article | 更新时间：2021-01-26

- Preparation and Radiation Shielding Properties of Sandwich-structured Lead-containing Polyimide Materials
- Acta Polymerica Sinica Issue 4, Pages: 507-514(2018)
- 作者机构：
  
  东南大学化学化工学院南京 211189
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.17121
  CLC：
- Published：20 April 2018，
  
  Received：3 May 2017，
  
  Revised：22 May 2017，
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Jin Wang, Lin-lin Deng, Ling-xiang Guo, Bao-ping Lin, Hong Yang. Preparation and Radiation Shielding Properties of Sandwich-structured Lead-containing Polyimide Materials. [J]. Acta Polymerica Sinica (4):507-514(2018)
DOI：

Jin Wang, Lin-lin Deng, Ling-xiang Guo, Bao-ping Lin, Hong Yang. Preparation and Radiation Shielding Properties of Sandwich-structured Lead-containing Polyimide Materials. [J]. Acta Polymerica Sinica (4):507-514(2018) DOI： 10.11777/j.issn1000-3304.2017.17121.

摘要

采用离子交换法合成了以化学方式键合铅离子的二胺单体4，4'-二氨基-1，1'-联二苯-2，2'-二磺酸铅BDSA（Pb），并与二胺单体4，4'-二氨基-二苯醚（ODA），二酐单体均苯四甲酸酐（PMDA）在溶剂

-甲基-2-吡咯烷酮（NMP）中完成缩聚反应，通过改变2种二胺单体的摩尔比，采用热亚胺法和流延法逐层浇筑的工艺，制备出了一系列侧基键合铅离子的三明治结构的聚酰亚胺复合材料PI（Pb），试图解决传统物理共混方法制备的复合材料中易出现的铅元素分布不均匀、机械性能差的科学问题.实验结果表明：以纯PI为参照物，制备的PI（Pb）复合材料对

241

Am（59.5 keV）、

238

Pu（79.9、176.7 keV）等中低能

射线具有很好的屏蔽效果，而且具备优良的耐辐照性能、优异的热稳定性能和良好的力学性能.

Abstract

4'-Diaminobiphenyl-2

2'-disulfonic acid lead (BDSA(Pb)) is synthesized by ion exchange method

and copolymerized with 4

4'-diaminodiphenyl ether (ODA) and 1

5-benzenetetracarboxylic anhydride (PMDA) in

-methyl-2-pyrrolidone (NMP). Through thermal imidization and layer-by-layer casting process

a series of membranes of three-layer sandwich-structured lead-ion-containing polyimide composite material PI(Pb) are prepared

aiming to solve the problems of inhomogeneous distribution of lead

phase segregation and poor mechanical properties. These problems are commonly observed in traditional composite materials prepared by physical blending

which has been widely used for fabrication of X-ray and

-ray shielding organic-inorganic composite materials by physically doping lead or its salts into a large volume of light-weight

easily-processed polymer matrixe. In this novel sandwich structure

the top and bottom layers are two pure polyimide layers obtained by polymerization of 4

4'-diaminodiphenyl ether with 1

5-benzenetetracarboxylic anhydride; the middle layer is the lead-ion-containing polyimide. The chemical and physical properties of this novel PI(Pb) composite material are throughly investigated

using nuclear magnetic resonance spectroscopy

Fourier transform infrared spectroscopy

elemental analysis

X-ray diffraction

thermal gravimetric analysis

tensile testing experiments and

-ray radiation

etc

. First

the thermal stability and mechanical properties of the PI(Pb) composite materials are examined and analyzed. Secondly

-ray radiation experiment is carried out on pure PI and PI(Pb) materials to analyze and compare their radiation resistance performances. Finally

the low-medium energy

-ray radiation shielding properties of the materials are investigated using multi-channel gamma spectroscopy. Compared with pure polyimide material

this PI(Pb) composite material has much better

-ray shielding capability under exposure of low-medium energy

-rays (such as

241

59.5 keV; and

238

79.9

176.7 keV)

enhanced radiation shielding rate

much higher linear attenuation and much lower half-value thickness

higher superior radiation resistance

excellent thermal stability and good mechanical performance.

关键词

复合材料聚酰亚胺辐射屏蔽三明治结构

Keywords

Composite materialPolyimideRadiation shieldingSandwich structure

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