Modeling of pvT behavior of semi-crystalline polymer based on the two-domain Tait equation of state for injection molding

被引:38
作者
Wang, Jian [1 ,2 ]
Hopmann, Christian [2 ]
Schmitz, Mauritius [2 ]
Hohlweck, Tobias [2 ]
Wipperfuerth, Jens [2 ]
机构
[1] Beijing Univ Chem Technol, Coll Mech & Elect Engn, Beijing 100029, Peoples R China
[2] Rhein Westfal TH Aachen, Inst Plast Proc IKV, D-52062 Aachen, Germany
关键词
pvT; Specific volume; Semi-crystalline polymer; Equation of state; Cooling rate; Injection molding; VOLUME-TEMPERATURE RELATIONSHIPS; COOLING-RATE; STATISTICAL THERMODYNAMICS; INDUCED CRYSTALLIZATION; POLYPROPYLENE; METHODOLOGY; SHRINKAGE; SIMULATE; QUALITY; LIQUIDS;
D O I
10.1016/j.matdes.2019.108149
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The absence of the influence of cooling rate in the pressure-specific volume-temperature (pvT) models makes them inadequate in the process simulation of injection molding. This work derived new equations of state (EoS) from the traditional two-domain Tait model that describes the pvT behavior of semi-crystalline polymers in both molten and solid state. Especially, the cooling rate was considered. The second aim of this work is to solve the discontinuity problem of the traditional two-domain Tait model. A continuous two-domain Tait EoS was developed. A good agreement between the calculations and experimental results was achieved. The new pvT models were successfully applied in the prediction of specific volume as a function of temperature, pressure and cooling rate during injection molding. A higher value of the specific volume was predicted when the cooling rate was considered. Combining the continuous two-domain Tait EoS, more accurate results can be obtained especially at the transition phase from melt to solid of the semi-crystalline polymer. (C) 2019 The Authors. Published by Elsevier Ltd.
引用
收藏
页数:10
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