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The effect of soluble β‐nucleator's content on crystalline structure and performance of polypropylene pipe
Journal of Vinyl and Additive Technology ( IF 3.8 ) Pub Date : 2020-07-28 , DOI: 10.1002/vnl.21794 Jiajun Guo 1 , Chun Zhang 1 , Min Nie 1 , Qi Wang 1
Journal of Vinyl and Additive Technology ( IF 3.8 ) Pub Date : 2020-07-28 , DOI: 10.1002/vnl.21794 Jiajun Guo 1 , Chun Zhang 1 , Min Nie 1 , Qi Wang 1
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Strength‐toughness clash of polypropylene (PP) pipe is an insurmountable bottleneck for the potential application. Here, we successfully prepared PP pipe with simultaneously enhanced toughness and hoop strength via addition of soluble β‐nucleators (β‐NAs) and application of helical flow in the extrusion. The outstanding combination of strength and toughness in the PP pipe depended on the loading content of β‐NAs and the helical pattern, which determined the morphology and alignment of β‐crystals. At the low content, β‐NAs dissolved completely into the PP melts and distributed homogeneously to promote the formation of β‐spherulites in the PP pipe. When the loading content exceeded the solubility limit, the β‐NAs partially dissolved and upon cooling, the dissolved β‐NAs grew preferentially on the undissolved ones along one direction, assembling into the fibrous aggregates. With the guidance of helical flow, the fibrous β‐NAs aligned off the axis and functioned as an oriented template to trigger the PP crystallization on the surface into hybrid β‐shish‐kebab with fibrous β‐NAs as shish. Increasing rotation speed of mandrel and die elevated hoop contribution to obtain the β‐shish‐kebab with a deviated angle of 55°, endowing the prepared pipe with high hoop strength and toughness.
中文翻译：
可溶性β成核剂含量对聚丙烯管晶体结构和性能的影响
聚丙烯（PP）管的强韧性冲突是潜在应用无法克服的瓶颈。在这里，我们通过添加可溶性β-成核剂（β-NAs）和在挤出过程中应用螺旋流的方法，成功地制备了具有增强的韧性和环向强度的PP管。PP管中强度和韧性的出色结合取决于β-NAs的含量和螺旋形，从而决定了β-晶体的形态和排列。在低含量下，β-NAs完全溶解在PP熔体中并均匀分布，从而促进PP管中β-球晶的形成。当负载量超过溶解度极限时，β-NAs部分溶解，冷却后，溶解的β-NAs优先沿一个方向在未溶解的β-NAs上生长，组装成纤维状聚集体。在螺旋流的引导下，纤维状的β-NAs偏离轴线排列，并作为定向模板，触发表面上的PP结晶为带有纤维状的β-NAs的杂化β-shish-kebab。提高心轴的旋转速度和提高模头的箍筋贡献度，以使β-shish-kebab倾斜角为55°，从而使制得的管材具有较高的箍筋强度和韧性。
更新日期：2020-07-28
中文翻译：
可溶性β成核剂含量对聚丙烯管晶体结构和性能的影响
聚丙烯（PP）管的强韧性冲突是潜在应用无法克服的瓶颈。在这里，我们通过添加可溶性β-成核剂（β-NAs）和在挤出过程中应用螺旋流的方法，成功地制备了具有增强的韧性和环向强度的PP管。PP管中强度和韧性的出色结合取决于β-NAs的含量和螺旋形，从而决定了β-晶体的形态和排列。在低含量下，β-NAs完全溶解在PP熔体中并均匀分布，从而促进PP管中β-球晶的形成。当负载量超过溶解度极限时，β-NAs部分溶解，冷却后，溶解的β-NAs优先沿一个方向在未溶解的β-NAs上生长，组装成纤维状聚集体。在螺旋流的引导下，纤维状的β-NAs偏离轴线排列，并作为定向模板，触发表面上的PP结晶为带有纤维状的β-NAs的杂化β-shish-kebab。提高心轴的旋转速度和提高模头的箍筋贡献度，以使β-shish-kebab倾斜角为55°，从而使制得的管材具有较高的箍筋强度和韧性。
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