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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Theoretical Prediction and Experimental Determination of the Effect of Mold Characteristics on Temperature and Monomer Conversion Fraction Profiles During Polymerization
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Theoretical Prediction and Experimental Determination of the Effect of Mold Characteristics on Temperature and Monomer Conversion Fraction Profiles During Polymerization

机译：聚合过程中模具特性对温度和单体转化分数分布的影响的理论预测和实验确定

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The present work is concerned with applications of a kinetic model for free-radical polymerization of a polymethylmethacrylate-based bone cement. Autocatalytic behavior at the first part of the reaction as well as a diffusion control phenomenon near vitrification are described by the model. Comparison of theoretical computations with experimental measurements for the temperature evolution during batch casting demonstrated the capacity of the proposed model to represent the kinetic behavior of the polymerization reaction. Temperature evolution and monomer conversion were simulated for the cure of the cement in molds made of different materials. The maximum monomer conversion fraction was markedly influenced by the physical properties of the mold material. The unreacted monomer acts as a plasticizer that influences the mechanical behavior of the cement. Hence, the same cement formulation cured in molds of different materials may result in different mechanical response because of the differences in the amounts of residual monomer. Standardization of the mold type to prepare specimens for the mechanical characterization of bone cements is recommended. Theoretical prediction of temperature evolution during hip replacement indicated that for cement thickness lower than 6 mm the peak temperature at the bone-cement interface was below the limit stated for thermal injury (50 deg C for more than 1 mm). The use of thin cement layers is recommended to diminish the risk of thermal injury; however, it is accompanied by an increase in the amount of unreacted monomer present in the cured material.
机译：本工作涉及用于基于聚甲基丙烯酸甲酯的骨水泥的自由基聚合的动力学模型的应用。该模型描述了反应第一部分的自催化行为以及玻璃化附近的扩散控制现象。理论计算与批量浇铸过程中温度变化的实验测量结果的比较表明，所提出的模型具有代表聚合反应动力学行为的能力。模拟了温度变化和单体转化率，以固化由不同材料制成的模具中的水泥。最大单体转化率明显受模具材料物理性能的影响。未反应的单体充当增塑剂，影响水泥的机械​​性能。因此，由于残留单体量的差异，在不同材料的模具中固化的同一水泥配方可能会导致不同的机械响应。建议对模具类型进行标准化，以准备用于骨水泥力学表征的样品。对髋关节置换过程中温度变化的理论预测表明，对于水泥厚度小于6 mm的骨水泥界面，其峰值温度低于热损伤所规定的极限（50℃超过1 mm）。建议使用薄水泥层以减少热损伤的风险。然而，这伴随着固化材料中存在的未反应单体的数量增加。

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