Relationships between impact performance and structures of rotationally molded crosslinked high‐density polyethylene,Polymer Engineering and Science

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Relationships between impact performance and structures of rotationally molded crosslinked high‐density polyethylene
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2020-11-06 , DOI: 10.1002/pen.25584
Yueqing Ren ₁ , Xiaojie Sun ₁ , Yafei Li ₁ , Lanlan Chen ₁ , Miaomiao Sun ₁ , Wenbin Liang ₁

Affiliation

Crosslinked high‐density polyethylene (XL‐HDPE) is a preferred material for chemical and fuel tanks due to its superior environmental stress crack resistance and impact strength. The impact performance of rotationally molded specimen is important for final products. In the research the drop weight impact strength (defined as ARM impact strength) of rotationally molded XL‐HDPE is tested between −40°C and 25°C. The crosslinking content, crystallization characteristics, and dynamic mechanical properties (DMA) of different thickness gradients are examined to illustrate the relationships between the impact strength, brittle‐ductile transition (BDT) and microstructures. The innermost surface layer (about 0.3 mm) has lower gel content, higher crystallinity, and average lamellar thickness compared with the body part. The ARM impact strength is about 1 J/mm at −40°C and −30°C, and about 29 J/mm at −20°C ~ 25°C. There is a BDT between −30°C and − 20°C. After removing the innermost surface layer, the sample breaks in ductile manner in the entire tested temperature range, and the ARM impact strength is about 24 ~ 26 J/mm. The DMA results show that the BDT is consistent with the structure transition of the innermost surface layer. The microstructures of rotationally molded XL‐HDPE in the innermost surface layer dominate the low temperature impact performance.

中文翻译：

旋转模塑交联高密度聚乙烯的冲击性能与结构之间的关系

交联高密度聚乙烯（XL-HDPE）由于其优异的耐环境应力开裂性和冲击强度而成为化学和燃料箱的首选材料。滚塑样品的冲击性能对最终产品很重要。在这项研究中，对滚塑XL-HDPE的落锤冲击强度（定义为ARM冲击强度）进行了测试，温度范围为−40°C至25°C。检查了不同厚度梯度的交联含量，结晶特性和动态力学性能（DMA），以说明冲击强度，脆性-韧性转变（BDT）与微观结构之间的关系。与身体部位相比，最里面的表面层（约0.3毫米）具有较低的凝胶含量，较高的结晶度和平均层状厚度。ARM冲击强度在-40°C和-30°C时约为1 J / mm，在-20°C〜25°C时约为29 J / mm。BDT在−30°C至−20°C之间。除去最里面的表面层后，样品在整个测试温度范围内均发生韧性断裂，ARM冲击强度约为24〜26 J / mm。DMA结果表明，BDT与最内层表面层的结构转变一致。最内层表层的滚塑XL-HDPE的微观结构主导着低温冲击性能。DMA结果表明，BDT与最内层表面层的结构转变一致。最内层表层的滚塑XL-HDPE的微观结构主导着低温冲击性能。DMA结果表明，BDT与最内层表面层的结构转变一致。最内层表层的滚塑XL-HDPE的微观结构主导着低温冲击性能。

更新日期：2020-11-06

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