Crystallization behavior and melting characteristics of PP nucleated by a novel supported β-nucleating agent

Morphology, structure and mechanical properties of polypropylene modified with organophilic montmorillonite

“…The nonisothermal crystallization behavior of nylon6(PA6)/attapulgite (AT) composites was studied by Shi et al [17] using differential scanning calorimetry, which indicated that AT nano-particles acted as nucleating agents during the crystallization of PA6/AT blends. Several authors present results based on PP crystallization process [13,[18][19][20][21][22] . The nucleating effect of nanoparticules of montmorilonite on crystallization process of systems based on PP + PP-g-MA (maleic anhydride grafted polypropylene) has been studied by Maiti et al [23] , and they related the decrease of spherulite size with increasing clay content which indicates that clay particles act as nucleating agents.…”

The effect of molecular mass on the polymorphism and crystalline structure of isotactic polypropylene

“…Several efficient and selective β-nucleating agents are known in the literature [4][5][6][7][8][9][10][11][12][13]. However, more or less α-iPP is always formed in their presence [5,[7][8][9][10].…”

“…The pure β-form of iPP was prepared by Varga et al [11] by the introduction of Ca-salt of suberic or pimelic acids. Recently, Zhang et al [12,13] used pimelic acid supported nano-sized CaCO 3 as β-nucleating agent. β-iPP has several advantageous properties compared to the traditional α-form, like higher impact resistance, ductility and better weldability [4,14,15].…”

Fracture resistance improvement of polypropylene by joint action of core–shell particles and nucleating agent

“…3b one can see that except PP/POE/CaCO 3 /TMB sample, the other four samples exhibit the typical melting behaviors of ␣-phase PP with the melt temperature (T m ) of about 168 • C. Factually, it has been proved in CaCO 3 toughened PP that surface modified CaCO 3 particles can induce the formation of ␤-phase PP [4,[20][21][22][23], which is usually thought to be one of the toughening mechanisms of the material. However, in this work, only the endothermic peak of ␣-phase PP can be detected, further suggesting that the nucleation role of CaCO 3 for PP crystallization is prevented.…”

“…Especially, Karger-Kocsis proposed that the enhanced toughness of ␤-phase could be attributed to a stress-induced transformation from less dense (␤-phase) to denser (␣-phase) crystalline structure at the root of a growing crack [18,19]. Thus, the nucleation effect of CaCO 3 in promoting the formation of ␤-phase is also thought to be one of the toughening mechanisms of PP toughened by CaCO 3 [4,[20][21][22][23].…”