Size‐Dependent Melting Temperature of Polymers

Macromolecular Theory and Simulations - Tập 12 Số 1 - Trang 57-60 - 2003
Qing Jiang1, Chun Cheng Yang2, Jian Chen Li2
1The Key Laboratory of Automobile Materials of Ministry of Education and Department of Materials Science and Engineering, Jilin University, Changchun 130025, China. Fax: 86‐431‐570‐5876
2The Key Laboratory of Automobile Materials of Ministry of Education and Department of Materials Science and Engineering, Jilin University, Changchun 130025, China

Tóm tắt

AbstractA general model for all kinds of size‐dependent melting points, free of any adjustable parameter, is extended to illustrate the size‐dependence of the melting temperature of polyethylene (PE). The model prediction for the depression of the melting temperature of PE is consistent with the calorimetric experimental results as shown in the Figure where the melting temperature of lamellae PE crystals as a function of the thickness of the crystals is presented. The Tm(D) function of PE shown as a solid line in terms of Equation (4). The necessary parameters for use of Equation (4) are shown in Table 1. The symbols ○ and • denote the experimental evidence of Tm(D) of linear alkanes14b and cyclic alkanes,14c respectively. The values of D are determined by D = 0.1273n6 with 0.1273 nm being the orthorhombic CC lattice distance in the c‐direction.5 The symbol □ denotes the experimental evidence of chain‐extended PE.6imageThe Tm(D) function of PE shown as a solid line in terms of Equation (4). The necessary parameters for use of Equation (4) are shown in Table 1. The symbols ○ and • denote the experimental evidence of Tm(D) of linear alkanes14b and cyclic alkanes,14c respectively. The values of D are determined by D = 0.1273n6 with 0.1273 nm being the orthorhombic CC lattice distance in the c‐direction.5 The symbol □ denotes the experimental evidence of chain‐extended PE.6

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Thông tin
Thông tin xuất bản

Macromolecular Theory and Simulations

Tập 12 Số 1

57-60

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