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Non-isothermal crystallization behaviors of poly(4-methyl-pentene-1)

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Abstract

Non-isothermal crystallization of isotactic poly(4-methyl-pentene-1) (P4MP1) is studied by differential scanning calorimeter (DSC), and kinetic parameters such as the Avrami exponent and the kinetic crystallization rate (Z c) are determined. From the cooling and melting curves of P4MP1 at different cooling rates, the crystalline enthalpy increases with the increasing cooling rate, but the degree of crystalline by DSC measurement shows not much variation. Degree of crystalline of P4MP1 calculated by wide angle X-ray diffraction pattern shows the same tendency with crystalline enthalpy, indicating that re-crystallization occurs when samples heated above the second glass transition temperature of P4MP1. By Jeziorny analysis, n 1 value suggests that mainly spherulites’ growth at 2.5 K min−1 transforms into a mixture mode of three-dimensional and two-dimensional space extensions with further increasing cooling rate. In the secondary crystallization process, n 2 values indicate that the secondary crystallization is mainly the two-dimensional extension of the lamellar crystals formed during the primary crystallization process. The rates of the crystallization, Z c and t 1/2 both increase obviously with the increase of cooling rate, especially at the primary crystallization stage. By Mo’s method, higher cooling rate should be required in order to obtain a higher degree of crystallinity at unit crystallization time.

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  1. Department of Polymer Science and Engineering, College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, 210009, People’s Republic of China

    Shuangjun Chen, Jing Jin & Jun Zhang

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  1. Shuangjun Chen
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Correspondence to Jun Zhang.

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Chen, S., Jin, J. & Zhang, J. Non-isothermal crystallization behaviors of poly(4-methyl-pentene-1). J Therm Anal Calorim 103, 229–236 (2011). https://doi.org/10.1007/s10973-010-0957-8

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