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

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 polymorp...

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Autores principales:	Wanxin Peng, Furui Sun, Yuke Liang, Jian Kang, Jinyao Chen, Wei Wang, Ya Cao, Ming Xiang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	istotactic polypropylene MXene nonisothermal crystallization behavior Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/8089d2d6a69b41f49a9f44b0be9227df
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spelling	oai:doaj.org-article:8089d2d6a69b41f49a9f44b0be9227df2021-11-11T18:48:16ZExploring the Effects of MXene on Nonisothermal Crystallization and Melting Behavior of β-Nucleated Isotactic Polypropylene10.3390/polym132138152073-4360https://doaj.org/article/8089d2d6a69b41f49a9f44b0be9227df2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3815https://doaj.org/toc/2073-4360In this study, one of the commonly used MXene (Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>) 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 T<sub>end</sub> = 50 °C and T<sub>end</sub> = 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.Wanxin PengFurui SunYuke LiangJian KangJinyao ChenWei WangYa CaoMing XiangMDPI AGarticleistotactic polypropyleneMXenenonisothermal crystallization behaviorOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3815, p 3815 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	istotactic polypropylene MXene nonisothermal crystallization behavior Organic chemistry QD241-441
spellingShingle	istotactic polypropylene MXene nonisothermal crystallization behavior Organic chemistry QD241-441 Wanxin Peng Furui Sun Yuke Liang Jian Kang Jinyao Chen Wei Wang Ya Cao Ming Xiang Exploring the Effects of MXene on Nonisothermal Crystallization and Melting Behavior of β-Nucleated Isotactic Polypropylene
description	In this study, one of the commonly used MXene (Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>) 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 T<sub>end</sub> = 50 °C and T<sub>end</sub> = 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.
format	article
author	Wanxin Peng Furui Sun Yuke Liang Jian Kang Jinyao Chen Wei Wang Ya Cao Ming Xiang
author_facet	Wanxin Peng Furui Sun Yuke Liang Jian Kang Jinyao Chen Wei Wang Ya Cao Ming Xiang
author_sort	Wanxin Peng
title	Exploring the Effects of MXene on Nonisothermal Crystallization and Melting Behavior of β-Nucleated Isotactic Polypropylene
title_short	Exploring the Effects of MXene on Nonisothermal Crystallization and Melting Behavior of β-Nucleated Isotactic Polypropylene
title_full	Exploring the Effects of MXene on Nonisothermal Crystallization and Melting Behavior of β-Nucleated Isotactic Polypropylene
title_fullStr	Exploring the Effects of MXene on Nonisothermal Crystallization and Melting Behavior of β-Nucleated Isotactic Polypropylene
title_full_unstemmed	Exploring the Effects of MXene on Nonisothermal Crystallization and Melting Behavior of β-Nucleated Isotactic Polypropylene
title_sort	exploring the effects of mxene on nonisothermal crystallization and melting behavior of β-nucleated isotactic polypropylene
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8089d2d6a69b41f49a9f44b0be9227df
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_version_	1718431712098123776

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

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