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首页> 外文期刊>Journal of Polymer Science, Part B. Polymer Physics >Evaluation of piezoelectric PVDF polymers for use in space environments. III. Comparison of the effects of vacuum UV and gamma radiation
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Evaluation of piezoelectric PVDF polymers for use in space environments. III. Comparison of the effects of vacuum UV and gamma radiation

机译：对用于太空环境的压电PVDF聚合物的评估。三，真空紫外线和伽玛辐射的效果比较

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Films of piezoelectric PVDF and P(VDF-TrFE) were exposed to vacuum UV (115-300 nm VLTV) and gamma-radiation to investigate how these two forms of radiation affect the chemical, morphological, and piezoelectric properties of the polymers. The extent of crosslinking was almost identical in both polymers after gamma-irradiation, but surprisingly, was significantly higher for the TrFE copolymer after VUV-irradiation. Changes in the melting behavior were also more significant in the TrFE copolymer after VLTV-irradiation due to both surface and bulk crosslinking, compared with only surface crosslinking for the PVDF films. The piezoelectric properties (measured using d(33) piezoelectric coefficients and D-E hysteresis loops) were unchanged in the PVDF homopolymer, while the TrFE copolymer exhibited more narrow D-E loops after exposure to either gamma- or VUV-radiation. The more severe damage to the TrFE copolymer in comparison with the PVDF homopolymer after VUV-irradiation is explained by different energy deposition characteristics. The short wavelength, highly energetic photons are undoubtedly absorbed in the surface layers of both polymers, and we propose that while the longer wavelength components of the VLTV radiation are absorbed by the bulk of the TrFE copolymer causing crosslinking, they are transmitted harmlessly in the PVDF homopolymer. (c) 2006 Wiley Periodicals, Inc.
机译：将压电PVDF和P（VDF-TrFE）的薄膜暴露于真空紫外线（115-300 nm VLTV）和伽马辐射下，以研究这两种辐射形式如何影响聚合物的化学，形态和压电性能。 γ辐照后两种聚合物的交联程度几乎相同，但令人惊讶的是，VUV辐照后的TrFE共聚物交联程度明显更高。与仅表面交联的PVDF薄膜相比，在VLTV辐照后的TrFE共聚物中，由于表面交联和本体交联，熔融行为的变化也更为显着。在PVDF均聚物中，压电特性（使用d（33）压电系数和D-E磁滞回线测量）没有变化，而TrFE共聚物在暴露于伽玛射线或VUV辐射后显示出更窄的D-E环。与VDF辐照后的PVDF均聚物相比，对TrFE共聚物的破坏更为严重，这是由不同的能量沉积特性所造成的。短波长的高能光子无疑会在两种聚合物的表面层中吸收，我们建议，虽然VLTV辐射的较长波长分量被TrFE共聚物的大部分吸收而引起交联，但它们在PVDF中无害地透射。均聚物。 （c）2006年Wiley Periodicals，Inc.

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