Chen Chih-Ming, Chang Huey-Ling, Lee Chun-Ying
Department of Mechanical Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan.
Department of Chemical and Materials Engineering, National Chin-Yi University of Technology, Taichung 41170, Taiwan.
Polymers (Basel). 2022 Aug 15;14(16):3319. doi: 10.3390/polym14163319.
The performance improvement of advanced electronic packaging material is an important topic to meet the stringent demands of modern semiconductor devices. This paper studies the incorporation of nano-alumina powder and thermoplastic elastomer (TPE) into thermoplastic polystyrene matrix to tune the thermal and mechanical properties after injection molding process. In the sample preparation, acetone was employed as a solvent to avoid the powder escape into surrounding during the mechanical mixing in a twin-screw mixer. The pressure and shear force were able to mix the composite with good uniformity in compositions. The samples with different compositions were fabricated using injection molding. The measured results showed that adding 5 wt.% of TPE into the simple polystyrene was able to raise the melt flow index from 12.3 to 13.4 g/10 min while the thermal decomposition temperature remained nearly unchanged. Moreover, the addition of small amount of nano-alumina powder could quickly improve the mechanical property by raising its storage modulus. For example, the addition of 3 wt.% of nano-alumina powder had an increase of 7.3% in storage modulus. Over doping of nano-alumina powder in the composite, such as 10 wt.%, on the other hand, lowered the storage modulus from 2404 MPa to 2069 MPa. The experimental study demonstrated that the tuning in the polystyrene's thermal and mechanical properties is feasible by composition modification with nano-alumina powder and TPE. The better concentration of the additives should be determined according to the specific applications.
先进电子封装材料性能的提升是满足现代半导体器件严苛要求的一个重要课题。本文研究了将纳米氧化铝粉末和热塑性弹性体（TPE）加入到热塑性聚苯乙烯基体中，以在注塑成型后调节其热性能和机械性能。在样品制备过程中，使用丙酮作为溶剂，以避免在双螺杆混合器中进行机械混合时粉末逸出到周围环境中。压力和剪切力能够使复合材料在成分上具有良好的均匀性。使用注塑成型制备了不同成分的样品。测量结果表明，在简单聚苯乙烯中添加5 wt.%的TPE能够使熔体流动指数从12.3提高到13.4 g/10 min，而热分解温度几乎保持不变。此外，添加少量纳米氧化铝粉末可以通过提高其储能模量快速改善机械性能。例如，添加3 wt.%的纳米氧化铝粉末可使储能模量提高7.3%。另一方面，在复合材料中过度掺杂纳米氧化铝粉末，如10 wt.%，会使储能模量从2404 MPa降至2069 MPa。实验研究表明，通过用纳米氧化铝粉末和TPE进行成分改性来调节聚苯乙烯的热性能和机械性能是可行的。添加剂的更佳浓度应根据具体应用来确定。
