Gamma-ray irradiation effects on scCO<sub>2</sub> foaming behavior of polypropylene

Chenguang YANG; Quan ZHAO; Mouhua WANG; Zhe XING; Guozhong WU

doi:10.11889/j.1000-3436.2018.rrj.36.010301

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Gamma-ray irradiation effects on scCO₂ foaming behavior of polypropylene

RADIATION CHEMISTRY | 更新时间：2021-12-10

- Gamma-ray irradiation effects on scCO₂ foaming behavior of polypropylene
- Journal of Radiation Research and Radiation Processing Vol. 36, Issue 1, (2018)
- 作者机构：
  
  1.中国科学院上海应用物理研究所嘉定园区上海 201800
  2.中国科学院大学北京 100049
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(11079048)
- DOI：10.11889/j.1000-3436.2018.rrj.36.010301
  CLC：
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Chenguang YANG, Quan ZHAO, Mouhua WANG, et al. Gamma-ray irradiation effects on scCO₂ foaming behavior of polypropylene. [J]. Journal of Radiation Research and Radiation Processing 36(1):010301-9(2018)
DOI：

Chenguang YANG, Quan ZHAO, Mouhua WANG, et al. Gamma-ray irradiation effects on scCO₂ foaming behavior of polypropylene. [J]. Journal of Radiation Research and Radiation Processing 36(1):010301-9(2018) DOI： 10.11889/j.1000-3436.2018.rrj.36.010301.

摘要

系统研究了γ射线辐照改性聚丙烯（PP）的超临界二氧化碳（scCO,2,）发泡行为。聚丙烯样品的制备采用两种辐照方法：（I）PP粒子热压成型后γ射线辐照（Sequence I，SI）；（II）PP粒子γ射线辐照后热压成型（Sequence II，SII）。利用scCO,2,作为物理发泡剂对两类样品进行间歇发泡。结果表明：γ射线辐照改性PP的熔点和结晶度随吸收剂量的增加而降低，其结晶度从51%下降到40%；在低频区，辐照后PP黏度轻微下降，而PP（SII）样品下降更为明显；PP（SI）发泡片材微孔尺寸变均匀，发泡率得到大幅提高，在40和50 kGy，不存在未发泡区域，并且拉伸性能从3.9 MPa增加到7.1 MPa；在最佳吸收剂量30 kGy时，发泡温度下降约5 ℃，发泡温度窗口从4 ℃增加到6~8℃。SI方式可以降低发泡温度，扩大发泡温度窗口，更有利于PP的scCO,2,发泡。

Abstract

The effects of γ-ray irradiation on the supercritical carbon dioxide (scCO,2,) foaming behavior of polypropylene (PP) were systematically studied. Sheets of PP were prepared through two different methods: irradiation after hot pressing (Sequence I, SI), and hot pressing after irradiation (Sequence II, SII). Carbon dioxide was used as the physical foaming agent. It was found that the crystallinities (51% to 40%) and melting points decreased with the increasing absorbed doses. At low frequency, the complex viscosity of PP decreased after irradiation, and the decrease was more pronounced for PP(SII) than PP(SI). The PP(SI) foam possessed an uniform cell size and a higher foaming rate, and its tensile strength increased from 3.9 MPa to 7.1 MPa compared with those of pure PP and PP(SII). In addition, at the optimum absorbed dose of 30 kGy, the suitable foaming temperature was around 145~153 ℃, and a wider foaming temperature (6~8 ℃) was obtained compared with the original 4 ℃. Therefore, irradiation after hot pressing (,i,.,e,., SI) was considered more suitable for the foaming of irradiated PP, resulting in a higher tensile strength and a wider foaming temperature window.

关键词

γ射线辐照聚丙烯（PP）超临界二氧化碳发泡（scCO2）拉伸强度流变性能

Keywords

γ-ray irradiationPolypropyleneSupercritical CO2 foamingTensile strengthRheological property

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⁰

Gamma-ray irradiation effects on scCO2 foaming behavior of polypropylene

DOI：10.11889/j.1000-3436.2018.rrj.36.010301

摘要

Abstract

关键词

Keywords

references

Gamma-ray irradiation effects on scCO₂ foaming behavior of polypropylene