Crystallization and melting behavior of isotactic polypropylene composites filled by zeolite supported β-nucleator

Effective method for the synthesis of pimelic acid/TiO2 nanoparticles with a high capacity to nucleate β-crystals in isotactic polypropylene nanocomposites

“…iPP can crystallize into different crystalline phases depending on its stereochemical structure, molecular weight, temperature of crystallization, pressure applied during the crystallization process, and also by adding additives [1][2][3][4][5][6][7][8][9][10]. The main crystalline phases are known as a-, b-, c-, and mesomorphic or smectic form [2][3][4][5][6][7][8][9][10].…”

“…iPP can crystallize into different crystalline phases depending on its stereochemical structure, molecular weight, temperature of crystallization, pressure applied during the crystallization process, and also by adding additives [1][2][3][4][5][6][7][8][9][10]. The main crystalline phases are known as a-, b-, c-, and mesomorphic or smectic form [2][3][4][5][6][7][8][9][10]. The a form is the primary form of polypropylene obtained under normal processing conditions [2][3][4][5][6]; however, the b-crystal is perhaps the most interesting crystalline phase for certain applications because of its hardness and impact resistance [2][3][4][5][6][8][9][10][11][12][13][14][15].…”

“…The main crystalline phases are known as a-, b-, c-, and mesomorphic or smectic form [2][3][4][5][6][7][8][9][10]. The a form is the primary form of polypropylene obtained under normal processing conditions [2][3][4][5][6]; however, the b-crystal is perhaps the most interesting crystalline phase for certain applications because of its hardness and impact resistance [2][3][4][5][6][8][9][10][11][12][13][14][15]. Therefore, different nucleating agents have been used to promote this type of crystal in iPP composites.…”

“…These authors found that PA and magnesium pimelate were weak b nucleators. Different substrates have been explored as supports for depositing calcium pimelate, e.g., carbonates [3,11,20], silicates [5,21], zeolites [4], oxides [3], metallic salts [8,9,14,22,23], clays [24], and carbon nanotubes [6], which are responsible for more than 90 % of the b-crystals. b nucleating agents continue as the main route to obtain b-phase in isotactic polypropylene.…”

Monetaria moneta as a novel β-nucleating agent for isotactic polypropylene

“…Among the various methods to obtain b-phase PP, addition of bnucleating agent has been found as the most effective and convenient method. The common b-nucleating agent that have been reported include, aromatic amides (TMB-5) [14], calcium stearate [15] and calcium pimelate [16,17].…”