Influence of additives on the structure and properties of polymers: 2. Polymorphic transitions of isotactic polypropylene caused by aminosulphur compounds

Structure and Mechanical Behavior of Isotactic Polypropylene Composites Filled with Silver Nanoparticles

“…However, the "dimensional lattice matching theory" cannot be applied to all β-nucleating agents. Garbarczyk [29] reported that the shape of β-nucleating agents plays an important role on the β-PP formation. Nucleators with plat or lumpish morphology favor the growth of β-PP.…”

“…The most commonly used low-cost fillers for PP include talc, calcium carbonate, short glass fiber and mica [1][2][3][4][5][6]. However, a large volume fraction of fillers, ca [25][26][27][28][29][30] % is needed to achieve desired mechanical properties. Such large volume content of fillers with micrometric sizes can lead to poor processability and severe wear of processing facilities.…”

Advances in Polypropylene Based Materials

“…In most cases, the β-form can only be partially formed in samples mixed with α-form. A high content of the β-form in iPP can be achieved under special conditions such as rapid quenching, zone solidification, crystallization under a temperature gradient [12,15] or in the presence of selective β nucleating agents [21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Conformation of macromolecules in γ-form is analogous to α form, and it can be obtained as a result of crystallization under elevated pressure above 200 MPa and from iPP samples with a low molecular weight.…”

Crystallization of Polypropylene: Application of Differential Scanning Calorimetry Part Ii. Crystal Forms and Nucleation

“…A high content of the β-form in iPP can be achieved under special conditions such as rapid quenching, zone solidification, crystallization under a temperature gradient [12,13] or in the presence of selective β nucleating agents [14][15][16][17][18][19][20][21][22][23][24][25][26][27]. During deformation, the β-form in iPP can be transformed into α-form at high temperature or by melt recrystallization at elevated temperature close to the melting temperature of bulk samples.…”