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首页> 外文期刊>Journal of Applied Polymer Science >Injection molding of a starch/EVOH blend aimed as an alternative biomaterial for temporary applications
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Injection molding of a starch/EVOH blend aimed as an alternative biomaterial for temporary applications

机译：淀粉/ EVOH共混物的注塑成型，旨在作为临时应用的替代生物材料

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Biodegradable polymers show great potential to be used as materials for temporary implants and bone replacement applications in orthopedics. However, its use in high load-bearing applications will depend on the successful development of biodegradable implants with a mechanical performance matching that of human bone. This article describes the optimization of the injection molding process of an alternative biodegradable starch-based polymer aimed at biomedical applications. A blend of starch with a copolymer of ethylene-vinyl alcohol (SEVA-C) was studied. Both conventional injection molding and shear controlled orientation (SCORIM) were optimized with the support of design of experiments and analysis of variance techniques. The mechanical characterization was performed by tensile testing. The structure developed within the moldings was assessed by wide-angle X-ray diffraction and differential scanning calorimetry. Increases up to 30% in the tangent modulus and 20% in the ultimate tensile strength compared with conventional molding were achieved with the application of SCORIM. The holding pressure and the frequency of the shear applied have the strongest influence on the morphology development and consequently on the mechanical performance. The solidification of SEVA-C at high cavity pressures enhances stiffness for long durations of the shearing stage in SCORIM. However, the effect of viscous heating of SEVA-C is important and ought to be considered. A decrease of the material phase miscibility in SEVA-C occurs as result of the shear fields imposed. The microstructure evaluation suggests that the mechanical properties enhancement in SCORIM molded SEVA-C is attributable to preferred orientation developed during processing. (C) 2000 John Wiley & Sons, Inc. [References: 33]
机译：可生物降解的聚合物显示出巨大的潜力，可用作骨科手术中临时植入物和骨替代应用的材料。然而，其在高承重应用中的使用将取决于可生物降解植入物的成功开发，其机械性能可与人骨相媲美。本文介绍了针对生物医学应用的替代性可生物降解淀粉基聚合物注射成型工艺的优化。研究了淀粉与乙烯-乙烯醇共聚物（SEVA-C）的共混物。在实验设计和方差分析的支持下，常规注射成型和剪切控制取向（SCORIM）均得到了优化。通过拉伸测试进行机械表征。通过广角X射线衍射和差示扫描量热法评估模制品内形成的结构。与传统成型相比，使用SCORIM可使切线模量提高30％，极限拉伸强度提高20％。保持压力和所施加剪切的频率对形态的发展影响最大，因此对机械性能的影响最大。在高腔压力下，SEVA-C的固化可提高SCORIM中剪切阶段的持续时间的刚度。但是，SEVA-C的粘性加热效果很重要，应予以考虑。由于施加了剪切场，SEVA-C中的材料相混溶性降低。微观结构评估表明，SCORIM模制SEVA-C的机械性能增强归因于加工过程中产生的优选取向。 （C）2000 John Wiley＆Sons，Inc. [参考：33]

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