Geopolymers
Inorganic polymeric new materials
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Shuangjun Chen
Shuangjun Chen
Department of Polymer Science and Engineering, College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, People's Republic of China
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Jing Jin
Jing Jin
Department of Polymer Science and Engineering, College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, People's Republic of China
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Jun Zhang
Jun Zhang
Department of Polymer Science and Engineering, College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, People's Republic of China
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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 (Zc) 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, n1 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, n2 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, Zc and t1/2 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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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
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1 |
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| Founder | Akadémiai Kiadó |
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| ISSN | 1388-6150 (Print) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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