通过控制分散相尺寸实现聚烯烃弹性体增韧聚丙烯的高温强度和低温伸长率同步,Journal of Applied Polymer Science

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通过控制分散相尺寸实现聚烯烃弹性体增韧聚丙烯的高温强度和低温伸长率同步
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2022-12-20 , DOI: 10.1002/app.53537
Lei Chen ₁ , Bin Cao ₁ , Xuewen Guo ₂ , Yiwu Quan ₁ , Shanzhi Yan ₃

Affiliation

改性聚丙烯（PP）材料的性能与其相结构密切相关。在这项工作中，使用各种类型的 POE（乙烯-丁烯 710、110、乙烯-丙烯 6202、乙烯-辛烯 8200）设计了具有不同相结构的聚烯烃弹性体 (POE) 增韧 PP 材料。然后，研究了 PP/POE 共混物中相分离对热性能和拉伸性能以及抗紫外线 (UV) 性能的影响。结果表明，POE 类型几乎不影响改性 PP 样品的熔体流动速率、熔融或结晶行为。此外，扫描电子显微镜结果表明，POE6202 在 PP 中具有更小的分散相尺寸（0.1-0.5 μm），这提高了低温断裂伸长率。具有较大微区 (1–5 μm) 的 PP/POE110 共混物具有更好的高温拉伸强度。此外，当同时用 POE110 和 POE6202 增韧时，改性 PP 具有出色的低温伸长率（272%@-40°C），而不会牺牲其高温拉伸强度（10.4 MPa@70°C）。最后，电子顺磁共振测试表明，非晶POE的添加降低了PP在辐照过程中产生的自由基强度，并促进了它们在衰变过程中的衰减。这表明 POE 的引入提高了 PP 的抗紫外线性能。电子顺磁共振测试表明，非晶POE的加入降低了PP在辐照过程中产生的自由基强度，并促进了它们在衰变过程中的衰减。这表明 POE 的引入提高了 PP 的抗紫外线性能。电子顺磁共振测试表明，非晶POE的加入降低了PP在辐照过程中产生的自由基强度，并促进了它们在衰变过程中的衰减。这表明 POE 的引入提高了 PP 的抗紫外线性能。

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Realizing simultaneous high-temperature strength and low-temperature elongation in polyolefin elastomer toughened polypropylene via controlling the dispersed phase size

The properties of modified polypropylene (PP) materials are closely related to their phase structure. In this work, polyolefin elastomer (POE)-toughened PP materials with different phase structures were designed by using various types of POEs (ethylene-butene 710, 110, ethylene-propylene 6202, ethylene-octene 8200). Then, the effects of phase separation in PP/POE blends on both thermal and tensile properties as well as ultraviolet (UV) resistance were investigated. The results revealed that the POE type hardly affected the melt flow rate, melting or crystallization behavior of the modified PP samples. Moreover, scanning electron microscopy results showed that POE6202 had a smaller dispersed phase size in PP (0.1–0.5 μm), which improved the low-temperature elongation at break. PP/POE110 blends with a larger microdomain (1–5 μm) had better high-temperature tensile strength. Further, when toughened with POE110 and POE6202 simultaneously, modified PP had excellent low-temperature elongation (272%@ −40°C) without sacrificing as much of its high-temperature tensile strength (10.4 MPa@70°C). Finally, Electron Paramagnetic Resonance tests showed that the addition of amorphous POE decreased the intensity of free radicals generated in PP during irradiation and promoted their attenuation during decay. This indicated that the introduction of POE improved the UV resistance of PP.

更新日期：2022-12-20

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