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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Residual Monomer Content on Some Properties of a Poly(methyl methacrylate)-Based Bone Cement
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Effect of Residual Monomer Content on Some Properties of a Poly(methyl methacrylate)-Based Bone Cement

机译：残余单体含量对聚甲基丙烯酸甲酯基骨水泥某些性能的影响

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摘要

Through this article,the degree of polymerization attainable in a commercial acrylic bone cement based on poly(methyl methacrylate)(PMMA) was investigated by differential scanning calorimetry(DSC) and gas chromatography (GC).The results obtained revealed a marked dependence between the maximum monomer conversion and the cure temperature.Specimens for the mechanical evaluation of the cement were subjected to two different cure conditions:one set of samples was allowed to cure at poom temperature and an additional set was also postcured at 140 deg C for 2h.The latter thermal treatment permitted one to discard the presence of the unreacted monomer in the hardened material,The effect of the unreacted monomer on the mechanical behavior was evaluated by measuring the flexural modulus(E),the compressive yield stress(#sigma#_y),and the fracture toughness(K_(IC).Samples prepared at room temperature for mechanical evaluation contained residual monomer which acts as a plasticizer of the matrix,increasing K_(IC) and decreasing E and #sigma#_y.The cure temperature and mold dimensions influence the amount of the residual monomer in the bardened material.Thus,differences in the values of the mechanical properties measured for the same commercial formulation may be attributed to a different mold dimension used in the test.
机译：通过差示扫描量热法（DSC）和气相色谱（GC）研究了基于聚（甲基丙烯酸甲酯）（PMMA）的商用丙烯酸骨水泥的聚合度。最大的单体转化率和固化温度用于水泥力学评估的标本在两种不同的固化条件下进行：一组样品在喷涂温度下固化，另一组样品在140摄氏度下后固化2小时。后一种热处理使人们可以丢弃硬化材料中未反应单体的存在。通过测量挠曲模量（E），压缩屈服应力（＃sigma＃_y）评估未反应单体对机械性能的影响，在室温下制备的用于力学评估的样品中，残留的单体作为基体的增塑剂。 K_（IC）减小，E和＃sigma＃_y减小。固化温度和模具尺寸影响着胶结材料中残留单体的量。因此，对于相同的商业配方测得的机械性能值可能存在差异归因于测试中使用的不同模具尺寸。

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