Recent Studies on β-Crystalline Form of Isotactic Polypropylene

1994 ◽  
pp. 259-269 ◽  
Author(s):  
Guanyi Shi
Keyword(s):  
Isotactic Polypropylene ◽  
Crystalline Form

The β crystalline form of isotactic polypropylene

1968 ◽  
Vol 6 (8) ◽  
pp. 539-546 ◽  
Author(s):  
A. Turner-Jones ◽  
A. J. Cobbold
Keyword(s):  
Isotactic Polypropylene ◽  
Crystalline Form

Effects of mineral additives on the ?-crystalline form of isotactic polypropylene

2002 ◽  
Vol 85 (8) ◽  
pp. 1742-1748 ◽  
Author(s):  
Jiachun Feng ◽  
Mingcai Chen ◽  
Zhitang Huang ◽  
Yuanqiang Guo ◽  
Hongqi Hu
Keyword(s):  
Isotactic Polypropylene ◽  
Crystalline Form ◽  
Mineral Additives

Studies on the β-crystalline form of isotactic polypropylene

1986 ◽  
Vol 24 (3) ◽  
pp. 461-491 ◽  
Author(s):  
P. Jacoby ◽  
B. H. Bersted ◽  
W. J. Kissel ◽  
C. E. Smith
Keyword(s):  
Isotactic Polypropylene ◽  
Crystalline Form

Melting, Crystallization Behaviors and Mechanical Properties of iPP Nucleated by β Nucleation Masterbatches

2014 ◽  
Vol 941-944 ◽  
pp. 1229-1232
Author(s):  
Guo Rui Dou ◽  
Qiang Dou
Keyword(s):  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Impact Strength ◽  
Isotactic Polypropylene ◽  
Tensile Strain ◽  
Mechanical Tests ◽  
Crystalline Form ◽  
Scanning Calorimetry ◽  
Crystallization Behaviors ◽  
Injection Molded

Injection-molded β-isotactic polypropylene (β-iPP) specimens were prepared by adding three β nucleation masterbatches, i.e., NT-MA, NT-MB and NT-MC, respectively. The melting, crystallization and mechanical properties of β-iPP specimens were investigated by means of differential scanning calorimetry (DSC) and mechanical tests. It is revealed that β crystalline form contents were enhanced by the β nucleation masterbatches, and the β contents of the cores were higher than those of the skins of injection molded specimens. The tensile strain at break and Izod notched impact strength of iPP were greatly improved by the β nucleation masterbatches. It was found that the β nucleation efficiency was in the order: NT-MC > NT-MA > NT-MB.

scholarly journals Effect of Different Nucleating Agents on the Crystallization of Ziegler-Natta Isotactic Polypropylene

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Felipe Avalos-Belmontes ◽  
Luis Francisco Ramos-deValle ◽  
Adriana Berenice Espinoza-Martínez ◽  
Juan Guillermo Martínez-Colunga ◽  
Eduardo Ramírez-Vargas ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanofibers ◽  
Isotactic Polypropylene ◽  
Crystallization Temperature ◽  
Carbon Nanoparticles ◽  
Crystallization Process ◽  
Life Time ◽  
Nucleating Agent ◽  
Crystalline Form ◽  
Nucleating Agents

Ziegler-Natta isotactic polypropylene (iPP) was melt mixed with four different nucleating agents (carbon nanotubes (CNT), carbon nanofibers (CNF), lithium benzoate (LiBe), and a sorbitol derivative (Millad)) in order to study their effect on the crystallization of iPP. It was found that the four different nucleating agents promote the alpha crystalline form. At 0.01 wt%, the carbon nanoparticles produced the higher crystallization temperature “Tc” (~119°C), whereas, at 0.10 wt%, LiBe and Millad produced a markedly higherTc(~125°C).Tcof pure iPP was 111°C. With 0.1 wt% nucleating agent, at 120°C, the crystallization half-life time of PP, when using LiBe or Millad, was 15 times faster than for pure PP, whereas, when using carbon nanoparticles, it was 20–25 times faster. At 135°C, with 0.01 wt% nucleating agent, the isothermal crystallization process of iPP was completed after 25 min, as well as with Millad. With LiBe, it was completed after just 15 min and, with any of the carbon nanoparticles, it was practically over after only a couple of minutes.

β-nucleators and β-crystalline form of isotactic polypropylene

1995 ◽  
Vol 56 (10) ◽  
pp. 1323-1337 ◽  
Author(s):  
Mei-Rong Huang ◽  
Xin-Gui Li ◽  
Bo-Rong Fang
Keyword(s):  
Isotactic Polypropylene ◽  
Crystalline Form
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