Effect of Malonic Acid Treatment on Crystal Structure, Melting Behavior, Morphology, and Mechanical Properties of Isotactic Polypropylene/Nano-CaCO3 Composites

2011 ◽  
Vol 50 (5) ◽  
pp. 831-845 ◽  
Author(s):  
Lin Li ◽  
Qiang Dou
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Malonic Acid ◽  
Isotactic Polypropylene ◽  
Acid Treatment ◽  
Melting Behavior ◽  
Morphology And Mechanical Properties

Morphology and mechanical properties of transcrystalline isotactic polypropylene

e-Polymers ◽  
2003 ◽  
Vol 3 (1) ◽  
Author(s):  
Koh-hei Nitta ◽  
Yoshikazu Yamamoto
Keyword(s):  
Mechanical Properties ◽  
Isotactic Polypropylene ◽  
Mechanical Energy ◽  
Supermolecular Structure ◽  
The Other ◽  
Morphological Properties ◽  
Spherulitic Morphology ◽  
Other Hand ◽  
Morphology And Mechanical Properties ◽  
Yielding Process

Abstract We examined mechanical and morphological properties of fully transcrystalline polypropylene grown from the surface of poly(tetrafluoroethylene) sheets. Comparison of mechanical properties between transcrystalline and spherulitic polypropylenes demonstrated that Young’s modulus is dependent on the crystallinity and independent of the supermolecular structure. On the other hand, the mechanical yielding process was predominantly affected by the supermolecular structure, and the mechanical energy required for yielding of transcrystalline sheets was greater than that of the spherulitic morphology. In addition, it was found that mechanical necking is required for the alignment of lamellae in the stretching direction. This means that the unfolding process of lamellae orienting in the stretching direction is associated with necking and ductility.

Morphology and mechanical properties of poly (phenylene sulfide)/isotactic polypropylene in situ microfibrillar blends

2005 ◽  
Vol 45 (9) ◽  
pp. 1303-1311 ◽  
Author(s):  
Hui Quan ◽  
Gan-Ji Zhong ◽  
Zhong-Ming Li ◽  
Ming-Bo Yang ◽  
Bang-Hu Xie ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Isotactic Polypropylene ◽  
Morphology And Mechanical Properties ◽  
Phenylene Sulfide

Crystalline morphology and mechanical properties of isotactic polypropylene composites filled by wollastonite with β-nucleating surface

2013 ◽  
Vol 35 (8) ◽  
pp. 1445-1452 ◽  
Author(s):  
Qian Ding ◽  
Zishou Zhang ◽  
Xin Dai ◽  
Mei Li ◽  
Kancheng Mai
Keyword(s):  
Mechanical Properties ◽  
Isotactic Polypropylene ◽  
Crystalline Morphology ◽  
Polypropylene Composites ◽  
Morphology And Mechanical Properties

Influence of Crystal Structure on Thermo-Mechanical Properties of Injection Molded 𝛃-Nucleated iPP

2021 ◽  
Vol 36 (5) ◽  
pp. 545-556
Author(s):  
A. Hamza ◽  
R. K. Arya ◽  
A. D. Palsodkar ◽  
G. R. Bhadu ◽  
S. J. A. Rizvi
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Maleic Anhydride ◽  
Isotactic Polypropylene ◽  
Coupling Agent ◽  
Scanning Calorimetry ◽  
Slow Cooling ◽  
Melt Compounding ◽  
Crystal Fraction ◽  
Injection Molded

Abstract Isotactic polypropylene (iPP) was nucleated in-situ with calcium pimelate during melt compounding. Calcium pimelate is a highly effective β-nucleator for isotactic polypropylene (iPP). The β-nucleated iPP was characterized by wide angle x-ray diffraction (WAXD) and differential scanning calorimetry (DSC) for its crystallinity and crystal structure. In addition, the injection-molded samples were tested for thermo-mechanical properties. It is found that very low quantity (< 0.1 wt. %) of β-nucleator is required to produce sufficiently high β-crystal fraction (Kβ) in isotactic polypropylene. β-nucleated iPP shows increment of 11 to 14 °C in its heat deflection temperature (HDT). It was also observed that slow cooling rate of β-nucleated iPP promotes the formation of β-crystals and that tensile stretching leads to complete transformation of β crystals into a-crystals at room temperature. It was also revealed that the presence of maleic anhydride grafted polypropylene (PP-g-MA), a well-known coupling agent (or compatibilizer), may reduce the (Kβ) value to a marginal extent. It was also observed that the thermo-mechanical properties were not much affected by the presence of PP-g-MA. Therefore, calcium pimelate may be used as β-nucleator in case of neat as well as reinforced polypropylene containing maleic anhydride as coupling agent.

Morphology and Mechanical Properties of the Mesomorphic Form of Isotactic Polypropylene in Stereodefective Polypropylene

2013 ◽  
Vol 46 (13) ◽  
pp. 5202-5214 ◽  
Author(s):  
Claudio De Rosa ◽  
Finizia Auriemma ◽  
Rocco Di Girolamo ◽  
Odda Ruiz de Ballesteros ◽  
Martina Pepe ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Isotactic Polypropylene ◽  
Morphology And Mechanical Properties
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