Influence of β nucleation agent on the dispersion of nano‐CaCO₃ in isotactic polypropylene matrix

Abstract

To study the interaction between b-nucleation agent and nano-CaCO 3 in iPP matrix, the dynamic rheology properties, crystallization and melting behaviors, impact fracture surface of b-nucleation agent (b-NA) nucleated and nano-CaCO 3 filled iPP were investigated in details in this study. Under suitable conditions, the b-NA has a ''promoting dispersion effect'' on the dispersion of nano-CaCO 3 in PP matrix. However, 0.2 wt % b-NA nucleated sample has a worse ''promoting dispersion effect'' than 0.05 wt % b-NA nucleated sample at relatively high nano-CaCO 3 content (7.5 wt %). The reason is that 0.2 wt % b-NA aggregates on the surface of nano-CaCO 3 agglomerations. The a crystals induced from b-crystals grow more regular and perfect than conventional a crystals. For the relative fraction of b crystals (K b ), the nano-CaCO 3 content has little influence on 0.05 wt % b-NA nucleated samples, but obvious effect on 0.2 wt % b-NA nucleated samples. Based on the investigated results, a mechanism model about the interaction between b-nucleation agent and nano-CaCO 3 in iPP matrix is proposed.

High‐quality modification of general polypropylene by the synergistic effect of zinc adipate, hydrotalcite, and polypropylene (SP179)

“…The impact fracture surface morphology of pure iPP was comparatively smooth, indicative of the brittle fracture of pure iPP (Figure 4a,a1). This type of fracture is similar to what was reported by Yang et al 48 and Zhang et al 49 In Figure 4b,b1, after the addition of HT, the fracture surface of iPP became rough and uneven with clear grooves, indicating that the addition of HT plays a toughening effect to a certain extent and changes the brittle fracture form to the ductile fracture form of iPP. With the addition of HT and ZnAA, the impact section of iPP became rough and uneven (Figure 4c–e).…”

Effect of hybrid wollastonite with different nucleation and morphology on the crystallization and mechanical properties of polypropylene

“…In view of this case, Grein [11] put forward the idea to combine the rigid of inorganic particles with the softening effect of bphase together. Since then, different inorganic particles have been selected to improve the rigidity of b-PP [12][13][14][15][16][17]. Although a few inorganic particles such as functionalized silica nanoparticles and calcite have a synergistic effect with b-nucleating agent, a majority of common inorganic particles have strong a-nucleation and compete with the b-nucleation of b-nucleator, resulting in the decline of b-phase content as well as the impact strength of PP.…”

Melting and crystallization behaviors, morphology, and mechanical properties of β‐polypropylene/polypropylene‐graft‐maleic anhydride/calcium sulfate whisker composites

“…The β‐PP could be formed through CaCO 3 treated with pimelic acid (PA) and malonic acid (MA), wollastonite treated by PA and MA, mica treated by PA, eggshell modified by PA, zeolite modified by PA, montmorillonite modified by PA, as well as CaO and BaO treated by PA. Zhan et al found that multiwalled carbon nanotube (MWCNT) supporting N,N ′‐dicyclohexyl‐1,5‐diamino‐2,6‐naphthalenedicarboxamide could effectively induce the formation of β‐crystals in PP. Some researchers have introduced β‐nucleating agent into the PP matrix to create β‐PP, and β‐PP composites containing CaCO 3 , talc, mica, glass flake, organo‐montmorillonite, MWCNT, zeolite and inorganic fullerene‐like tungsten disulphide. Liu et al used halloysite nanotube (HNT) as a β‐nucleating agent, and the composite with 20 phr of HNT had the highest amount of β phases.…”