|Kersch, M.; Schmidt, H.-W.; Altstädt, V.: Influence of different beta-nucleating agents on the morphology of isotactic polypropylene and their toughening effectiveness, Polymer, 98, 320-326 (2016) -- DOI: 10.1016/j.polymer.2016.06.051|
The inﬂuence of two 1,3,5-benzenetrisamide beta-nucleating agents in comparison to a commercial bisamide beta-nucleating agent on the morphological and mechanical properties of isotactic poly-propylene (iPP) is presented. To complete the study, the neat iPP and iPP containing a 1,3,5-benzenetrisamide alpha-nucleating agent was investigated. To evaluate the effectiveness of the different supramolecular polymer additives with regard to their inﬂuence on the toughness of iPP, a difﬁcult-to-toughen high melt ﬂow rate (MFR) iPP grade was selected. Investigations by wide-angle X-ray scattering (WAXS) conﬁrm that the two 1,3,5-benzenetrisamides and commercial beta-nucleating agent induce the beta crystal modiﬁcation of the polymer, whereas only the alpha modiﬁcation is observed for the neat polymer and the 1,3,5-benzenetrisamide alpha-nucleating agent. Scanning electron microscopy (SEM) pictures on etched samples clearly reveal a shish-kebab structure in beta-nucleated iPP with 1,3,5-benzenetrisamides. For these two samples, Charpy impact investigations show a pronounced increase in toughness, also compared to the commercial bisamide beta-nucleating agent.