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首页> 外文期刊>Journal of Applied Polymer Science >Influence of ultraviolet aging on the structure, mechanical and gas permeability properties of hydrogenated nitrile butadiene rubber
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Influence of ultraviolet aging on the structure, mechanical and gas permeability properties of hydrogenated nitrile butadiene rubber

机译：紫外线老化对氢化丁腈橡胶结构，机械和透气性能的影响

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摘要

The effect of ultraviolet (UV) radiation on the structure and performance of hydrogenated nitrile butadiene rubber (HNBR) was studied in this paper. The HNBR was exposed to UV radiation for various durations (0, 7, 14, 21 and 28 days). The Fourier transform infrared spectroscopy (FTIR) results demonstrated that the surface molecular structures were oxidized to generate oxygenated species under UV radiation. The oxidative degree enhanced with the increase of aging time, resulting in thicker and denser cracks on the surface. The plausible aging mechanism of HNBR was suggested. The free volume of HNBR before and after UV aging was characterized by positron annihilation lifetime spectroscopy (PALS) and their cross-linking density, compression set, mechanical and gas permeability properties were also analyzed. In the first 14 days of UV irradiation, the dominant chain-scission reaction led to a decrease in cross-linking density of HNBR, resulting in the enhancement of free volume and thereby the increase of gas permeability. When the aging time was longer than 14 days, cross-linking reaction played a leading role and the free volume decreased, thus causing the reduction of gas permeability. As the aging time increased, the glass transition temperature (T-g), tensile strength and storage modulus of HNBR initially reduced and then increased, which was in agreement with the changing trend of cross-linking density.
机译：研究了紫外辐射对氢化丁腈橡胶（HNBR）结构和性能的影响。HNBR暴露于紫外线辐射下不同时间（0、7、14、21和28天）。傅里叶变换红外光谱（FTIR）结果表明，在紫外线辐射下，表面分子结构被氧化生成含氧物种。随着时效时间的延长，氧化程度增强，导致表面裂纹更厚、更密集。提出了HNBR可能的老化机理。采用正电子湮没寿命谱（PALS）对紫外老化前后的HNBR自由体积进行了表征，并对其交联密度、压缩永久变形、力学性能和透气性能进行了分析。在紫外线照射的前14天，主要的断链反应导致HNBR交联密度降低，导致自由体积增加，从而增加气体渗透率。当老化时间超过14天时，交联反应起主导作用，自由体积减小，导致气体渗透率降低。随着老化时间的延长，HNBR的玻璃化转变温度（T-g）、拉伸强度和储能模量先降低后升高，这与交联密度的变化趋势一致。

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  • 来源
    《Journal of Applied Polymer Science》 |2021年第24期|共11页
  • 作者

    Tan Jinghua; Chen Chengliang; Wu Juying; He Ren; Jiang Linbing; Liu Yiwu;

  • 作者单位

    Hunan Univ Technol Natl &

    Local Joint Engn Ctr Adv Packaging Mat R&

    D Sch Packaging &

    Mat Engn Key Lab Adv Packaging Mat &

    Technol Hunan Prov Zhuzhou 412007 Peoples R China;

    Hunan Univ Technol Natl &

    Local Joint Engn Ctr Adv Packaging Mat R&

    D Sch Packaging &

    Mat Engn Key Lab Adv Packaging Mat &

    Technol Hunan Prov Zhuzhou 412007 Peoples R China;

    China Acad Engn Phys Inst Syst &

    Engn Mianyang Sichuan Peoples R China;

    China Acad Engn Phys Inst Syst &

    Engn Mianyang Sichuan Peoples R China;

    Hunan Univ Technol Natl &

    Local Joint Engn Ctr Adv Packaging Mat R&

    D Sch Packaging &

    Mat Engn Key Lab Adv Packaging Mat &

    Technol Hunan Prov Zhuzhou 412007 Peoples R China;

    Hunan Univ Technol Natl &

    Local Joint Engn Ctr Adv Packaging Mat R&

    D Sch Packaging &

    Mat Engn Key Lab Adv Packaging Mat &

    Technol Hunan Prov Zhuzhou 412007 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 高分子化合物工业（高聚物工业）;
  • 关键词

    ageing; irradiation; packaging; rubber; structureamp; 8208; property relationships;

    机译：老化;辐照;包装;橡胶;结构＆amp;8208;财产关系;

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