Isothermal Crystallization Kinetics of iPP During Self-nucleation Process

Abstract

Abstract: In this paper, the isothermal crystallization kinetics of polypropylene(iPP) during self-nucleation was studied by means of differential scanning calorimetry(DSC). The iPP was melted at 438 K and then isothermally crystallized in the range of temperature between 421 and 425 K. The mechanism of nucleation and growth of iPP was discussed. The Avrami equation was applied to analyzing the process of isothermal crystallization of iPP from the melt. The average value of Avrami exponent is n=3.01, suggesting that the primary crystallization maybe corresponds to three-dimensional spherulitic growth.The K_g value obtained from Lauritzen-Hoffman equation is 1.128×10⁵ K², which suggests that crystallization species should be regime Ⅱ. The decrease of crystallization active energy and chain folding work indicates that the self-nucleation can greatly promote the overall crystallization of iPP.

Key words: Polypropylene, Self-nucleation, Crystallization, Isothermal crystallization kinetics

CLC Number:

O631

TrendMD:

WANG Song, YANG De-Cai . Isothermal Crystallization Kinetics of iPP During Self-nucleation Process[J]. Chem. J. Chinese Universities, 2004, 25(1): 191.

[1]	JIANG Shenghan, CAO Changlin, XIAO Liren, YANG Tang, QIAN Qingrong, CHEN Qinghua. Preparation of Composite Semiconductor Micro-sheets with UV Shielding Performance and Its Application in Polypropylene [J]. Chem. J. Chinese Universities, 2022, 43(8): 20220071.
[2]	ZHOU Chengsi, ZHAO Yuanjin, HAN Meichen, YANG Xia, LIU Chenguang, HE Aihua. Regulation of Silanes as External Electron Donors on Propylene/butene Sequential Polymerization [J]. Chem. J. Chinese Universities, 2022, 43(10): 20220290.
[3]	LI Yichuan, ZHU Guofu, WANG Yu, CHAI Yongming, LIU Chenguang, HE Shengbao. Effects of Substrate Surface Properties and Precursor Chemical Environment on In⁃situ Oriented Construction of Titanium Silicalite Zeolite Membranes [J]. Chem. J. Chinese Universities, 2021, 42(9): 2934.
[4]	DU Bin, CHEN Shangtao, ZHANG Fengbo, SHI Xingbo, LI Rongbo. Nonlinear Rheological Behavior of Long Chain Branching Polypropylene [J]. Chem. J. Chinese Universities, 2021, 42(6): 2034.
[5]	LI Yanyan, DUAN Linrui, LUO Jingshan. Moisture-assisted Crystallization of Inorganic Perovskite CsPbI₃ Film [J]. Chem. J. Chinese Universities, 2021, 42(6): 1785.
[6]	MIAO Weijun, WU Feng, WANG Yong, WANG Zongbao. In⁃situ Study of the Epitaxial Crystallization of PCL/RGO at High Shear Rate [J]. Chem. J. Chinese Universities, 2021, 42(3): 910.
[7]	HUANG Huilong, HUANG Hanxiong. Low-temperature Impact Behavior of Droplet on Injection-compression Molded Nanostructured PP/POE Blend Surfaces [J]. Chem. J. Chinese Universities, 2021, 42(10): 3195.
[8]	WANG Juan, WANG Linying, ZHU Dali, CUI Wenhao, WANG Yifeng, TIAN Peng, LIU Zhongmin. Progress in Direct Synthesis of High Silica Zeolite Y [J]. Chem. J. Chinese Universities, 2021, 42(1): 1.
[9]	WU Qinming, WANG Yeqing, MENG Xiangju, XIAO Fengshou. Reconsideration of Crystallization Process for Aluminosilicate Zeolites [J]. Chem. J. Chinese Universities, 2021, 42(1): 21.
[10]	AN Yue, HUANG Hanxiong. Condensate Microdrop Dynamic Behavior on Injection-compression Molded Bionic Polypropylene Nanosurfaces [J]. Chem. J. Chinese Universities, 2020, 41(8): 1888.
[11]	WANG Yang, WANG Sidi, TANG Shaokun. Synthesis and Characterization of Imine-based Covalent Organic Framework(COF-LZU1) in Supercritical Carbon Dioxide [J]. Chem. J. Chinese Universities, 2020, 41(8): 1792.
[12]	HE Zhechao, XIA Kun, WANG Jing, ZHOU Dan, LU Xinhuan, XIA Qinghua. Controllable Synthesis of SAPO-5 Molecular Sieves and Exploration of the Crystallization Process ^† [J]. Chem. J. Chinese Universities, 2020, 41(6): 1224.
[13]	WANG Yuyao, ZHANG Qiang, YU Jihong. Synthesis of Hierarchical NaX Zeolite and Its CO₂ Adsorption Performance ^† [J]. Chem. J. Chinese Universities, 2020, 41(4): 616.
[14]	LIU Xuan, LIU Haoyu, LI Yifeng, ZHAO Jiaohong, YANG Rui. Infectious Effect of Organic Small Molecules on Photo-oxidative Aging of Polypropylene [J]. Chem. J. Chinese Universities, 2020, 41(12): 2838.
[15]	MA Yaping, ZHANG Ning, ZHENG Weiping, XIAO Weijia, LIU Chenguang, HE Aihua, SHAO Huafeng. Structures and Properties of Isotactic Polypropylene/Polybutene-1 In-reactor Alloys [J]. Chem. J. Chinese Universities, 2020, 41(12): 2851.

Isothermal Crystallization Kinetics of iPP During Self-nucleation Process

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Recommended Articles

Metrics

Comments