Effect of nano-CaCO3 on polymorphic behavior in syndiotactic polystyrene for non-isothermal crystallization

Polymer ◽  
2006 ◽  
Vol 47 (5) ◽  
pp. 1661-1666 ◽  
Author(s):  
Ming Lu ◽  
Weihua Zhou ◽  
Kancheng Mai
Keyword(s):  
Isothermal Crystallization ◽  
Syndiotactic Polystyrene ◽  
Polymorphic Behavior

Polymorphic Behavior of Syndiotactic Polystyrene Crystallized in Cylindrical Nanopores

2008 ◽  
Vol 41 (20) ◽  
pp. 7755-7758 ◽  
Author(s):  
Hui Wu ◽  
Wei Wang ◽  
Yan Huang ◽  
Cheng Wang ◽  
Zhaohui Su
Keyword(s):  
Syndiotactic Polystyrene ◽  
Polymorphic Behavior

Isothermal Crystallization-Induced Phase Transition of Syndiotactic Polystyrene Polymorphism

2001 ◽  
Vol 34 (19) ◽  
pp. 6727-6736 ◽  
Author(s):  
Rong-Ming Ho ◽  
Chien-Pang Lin ◽  
Ping-Yen Hseih ◽  
Tsai-Ming Chung ◽  
Hsien-Yin Tsai
Keyword(s):  
Phase Transition ◽  
Isothermal Crystallization ◽  
Syndiotactic Polystyrene

scholarly journals Exploring the Effects of MXene on Nonisothermal Crystallization and Melting Behavior of β-Nucleated Isotactic Polypropylene

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3815
Author(s):  
Wanxin Peng ◽  
Furui Sun ◽  
Yuke Liang ◽  
Jian Kang ◽  
Jinyao Chen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Isotactic Polypropylene ◽  
Isothermal Crystallization ◽  
Polarized Light ◽  
Thermal Conditions ◽  
Melting Behavior ◽  
Polymorphic Behavior ◽  
Scanning Calorimetry ◽  
Cooling Rates ◽  
Thermal Stability Of

In this study, one of the commonly used MXene (Ti3C2Tx) and β nucleated isotactic polypropylene (β-iPP)/MXene composites of different compositions were fabricated. The effects of MXene on non-isothermal crystallization and polymorphic behavior of β-iPP/MXene composites were comparatively studied. The non-isothermal crystallization kinetics indicates that for all samples, the lower cooling rates promote composites to crystallize at higher temperatures. When MXene and β-Nucleating agent (β-NA) are added separately, the crystallization temperature of composites shifts towards higher temperatures at all cooling rates. When MXene and β-NA are added simultaneously, the composite shows different cooling rate dependence, and the effects of improving crystallization temperatures is more obvious under rapid cooling. The activation energy of four samples iPP, iPP/MXene, iPP/β-NA, and iPP/MXene/β-NA were −167.5, −185.5, −233.8, and −218.1 kJ/mol respectively, which agree with the variation tendency of crystallization temperatures. The polymorphic behavior analysis obtained from Differential Scanning calorimetry (DSC) is affected by two factors: the ability to form β-crystals and the thermal stability of β-crystals. Because β-crystals tend to recrystallize to α-crystals below a critical temperature, to eliminate the effect of β-α recrystallization, the melting curves at end temperatures Tend = 50 °C and Tend = 100 °C are comparatively studied. The results show that more thermally unstable β-crystals would participate in β-α recrystallization with higher cooling rates. Moreover, thermal stability of β-crystals is improved by adding MXene. To further verify these findings, samples of three different thermal conditions were synthesized and analyzed by DSC, X-Ray Diffraction (XRD), and Polarized Light Optical Microscopy (PLOM), and the results were consistent with the above findings. New understandings of synthesizing β-iPP/MXene composites with adjustable morphologies and polymorphic behavior were proposed.

Effects of p-Methylstyrene Comonomeric Units on the Polymorphic Behavior of Syndiotactic Polystyrene

1995 ◽  
Vol 28 (19) ◽  
pp. 6508-6515 ◽  
Author(s):  
Carla Manfredi ◽  
Gaetano Guerra ◽  
Claudio De Rosa ◽  
Vincenzo Busico ◽  
Paolo Corradini
Keyword(s):  
Syndiotactic Polystyrene ◽  
Polymorphic Behavior

Effects of blending on the polymorphic behavior of melt-crystallized syndiotactic polystyrene

1991 ◽  
Vol 29 (3) ◽  
pp. 265-271 ◽  
Author(s):  
Gaetano Guerra ◽  
Claudio De Rosa ◽  
Vincenzo M. Vitagliano ◽  
Vittorio Petraccone ◽  
Paolo Corradini
Keyword(s):  
Syndiotactic Polystyrene ◽  
Polymorphic Behavior

Effects of crystallization temperature on the polymorphic behavior of syndiotactic polystyrene

Polymer ◽  
2002 ◽  
Vol 43 (8) ◽  
pp. 2489-2494 ◽  
Author(s):  
Yuying Li ◽  
Jiasong He ◽  
Wei Qiang ◽  
Xiao Hu
Keyword(s):  
Crystallization Temperature ◽  
Syndiotactic Polystyrene ◽  
Polymorphic Behavior
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