Micromoulding: process measurements, product morphology and properties
Micromoulding: process measurements, product morphology and properties
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DOI：
10.1179/146580104225018346
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发表时间：
2004-01-01
影响因子：
2
通讯作者：
Hornsby, P
中科院分区：
文献类型：
--
作者：
Whiteside, BR;Martyn, MT;Hornsby, P
微机电系统（MEMS）的发展和对越来越小长度尺度的功能器件的需求对工业产品的自动化提出了越来越高的要求。因此，微注塑成型（微成型）技术已经发展到用于大规模生产微小、复杂的聚合物和复合材料部件。虽然该技术有了显著的发展，但对工艺动态对产品性能的影响了解甚少。本文介绍了在这些实验室内进行的工作方案的细节，其目的是提高对聚合物加工性能相互作用的理解。更具体地说，正在探索微尺度加工对工程和商品聚合物、纳米复合材料、金属和陶瓷注射成型原料和生物材料的流变学、机械和摩擦学特性的影响。简单的分析表明，工艺条件可能比传统模塑过程中遇到的熔体更严格。高剪切和快速冷却速率与大的表面积与体积比相结合可能对微模塑产品的所得性质具有大得多的影响。巴滕费尔德Microsystem50微型成型机已配备了各种传感器和数据采集设备，为许多不同的腔体几何形状产生工艺数据。还开发了一种新型的微注射复合（MIC）机器，最大限度地减少了工艺阶段，并减少了材料暴露于过多的停留时间。本文详细介绍了微成型工艺条件对部件表面形貌和机械性能的影响，采用SEM、原子力显微镜和纳米压痕技术进行了测量。
The growth in Micro Electro-Mechanical Systems (MEMS) and demand for functional devices at smaller and smaller length scales has placed increasing demands on industry for product miniaturisation. Consequently, the micro-injection moulding (micromoulding) technology has evolved for the mass production of minute, intricate, polymer and composite components. Although there has been significant growth in the technology, there is little understanding of the effects of the process dynamics on product properties. This paper presents details of a programme of work conducted within these laboratories with the objectives of enhancing the understanding of polymer processing-property interaction. More particularly, the effects of microscale processing on the rheological, mechanical and tribological properties of engineering and commodity polymers, nanocomposites, metal and ceramic injection moulded feedstock and biomaterials are being explored. Simple analysis reveals that process conditions are potentially more severe on melts than those encountered during conventional moulding. High shear and rapid cooling rates combined with a large surface area to volume ratio may have a much greater influence over the resultant properties of a micromoulded product. A Battenfeld Microsystem50 micromoulding machine has been instrumented with a variety of sensors and data acquisition equipment, producing process data for a number of different cavity geometries. A novel microinjection compounding (MIC) machine has also been developed minimising the process stages and reducing material exposure to excessive residence times. This paper gives details of the effects of micromoulding process conditions on component surface morphology and mechanical properties measured using SEM, atomic force microscopy and nano-indentation techniques.