Suppression in Melt Viscosity of the Homogeneously Mixed Blends of Polypropylene (iPP–UHMWiPP) in the Presence of an Oxalamide,Macromolecules

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Suppression in Melt Viscosity of the Homogeneously Mixed Blends of Polypropylene (iPP–UHMWiPP) in the Presence of an Oxalamide
Macromolecules ( IF 5.1 ) Pub Date : 2022-03-28 , DOI: 10.1021/acs.macromol.1c02042
Ramiro Marroquin-Garcia ₁ , Nils Leone ₁ , Laurence G. D. Hawke _{1,

2} , Dario Romano _{1,

3} , Carolus H. R. M. Wilsens _{1,

4} , Sanjay Rastogi _{1,

3}

Affiliation

Here we report on the influence of an aliphatic oxalamide-based nucleating agent (OXA3,6) on the viscoelastic and mechanical properties of isotactic polypropylene (iPP) blended with ultrahigh molecular weight iPP (UHMWiPP). The linear viscoelastic properties are investigated by using a plate–plate rheometer; the presence of only 0.5 wt % of OXA3,6 in the iPP–UHMWiPP blends results in a reduction of the complex viscosity in the entire frequency domain examined. This observation holds irrespective of the UHMWiPP weight fraction, up to 25 wt %. The viscosity suppression is attributed to an acceleration of the reorientation times of the chains, especially the longer ones, due to partial alignment of their molecular segments. Furthermore, SAXS measurements on cooled, injection molded samples hint that OXA3,6-containing samples display enhanced alignment under processing conditions (injection molding). Compared to samples without OXA, an increase in the SAXS intensity along the equator is observed in the OXA3,6 samples, implying an enhanced ability of shish-kebab formation. Such a morphological development results in higher yield stress while maintaining the elastic behavior.

中文翻译：

在草酰胺存在下抑制聚丙烯 (iPP–UHMWiPP) 均匀混合共混物的熔体粘度

在这里，我们报告了基于脂肪族草酰胺的成核剂 (OXA3,6) 对与超高分子量 iPP (UHMWiPP) 共混的全同立构聚丙烯 (iPP) 的粘弹性和机械性能的影响。使用板-板流变仪研究线性粘弹性；在 iPP-UHMWiPP 共混物中仅存在 0.5 wt% 的 OXA3,6 会导致所检查的整个频域中的复数粘度降低。该观察结果与 UHMWiPP 重量分数无关，最高可达 25 wt%。粘度抑制归因于链的重新定向时间的加速，尤其是较长的链，由于其分子链段的部分排列。此外，对冷却的注塑样品的 SAXS 测量表明 OXA3、包含 6 个的样品在加工条件下（注塑成型）显示出增强的排列。与没有 OXA 的样品相比，在 OXA3,6 样品中观察到沿赤道的 SAXS 强度增加，这意味着烤肉串形成的能力增强。这种形态发展导致更高的屈服应力，同时保持弹性行为。

更新日期：2022-03-28

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