摘要
多材料复合结构是交通载运装备轻量化的发展趋势,异种材料的高质量连接是急需突破的关键共性技术瓶颈。铝合金与热塑性树脂基复合材料焊接成型技术是近年来的研究热点,然而二者的结合模式与结合机理尚不明晰,并且难以通过实验方法直接表征。为了探明聚酰胺树脂与铝合金的界面反应机理,本工作选取了四种代表性的聚酰胺类化合物PA6、PA66、PA610和PA612,采用量子力学和分子动力学方法,对聚合物与金属铝晶面的结合情况进行理论计算分析。四种聚酰胺分子均能在金属铝(011)晶面上进行化学吸附,形成稳定的吸附体系。两相界面结合主要以Al-O-C键合方式存在,Al-O键为极性共价键。聚酰胺分子与金属铝(011)晶面结合稳定性主要受聚酰胺分子碳链的长短和三维空间构型的影响,碳链越长产生的吸附位点越多,吸附稳定性越高。本研究可为铝合金与聚酰胺类树脂基复合材料(或聚酰胺类工程塑料)连接界面设计、方法选择和工艺改进提供理论指导。
Multi material composite structures are the development trend of transportation equipment lightweight,and the high-quality connection of dissimilar materials is one of the key common technical bottlenecks urgently needed to be overcome.The welding technology of aluminum alloys and thermoplastic composites has been a research hotspot in recent years.However,the bonding mode and mechanism are still unclear now,and it is difficult to directly characterize them through experimental methods.In order to explore the interface reaction mechanism between polyamide resins and aluminum alloys,the bonding between four types of representative polyamide compounds(PA6,PA66,PA610,and PA612)and the aluminum crystal planes has been theoretically calculated and analyzed using quantum mechanics and molecular dynamics methods in this work.All the above four types of polyamide molecules can be adsorbed on Al(011)crystal plane by chemisorption,forming stable adsorption systems.The interface bonding between the two phases mainly exists through Al-O-C mode,where the Al-O bond is a polar covalent bond.The stability of the binding between polyamide molecules and Al(011)crystal faces is mainly influenced by the carbon chain length and the three-dimensional spatial configuration of the polyamide molecules.The more adsorption sites are generated with the length of carbon chains,and the adsortion stability is increased at the same time.This study can provide theoretical guidance for the interface design,method selection,and process improvement of aluminum alloys and polyamide composites(or polyamide engineering plastics).
作者
曲华
刘韶庆
夏树伟
宋坤林
王姗姗
QU Hua;LIU Shaoqing;XIA Shuwei;SONG Kunlin;WANG Shanshan(National Innovation Center of High Speed Train(Qingdao),Qingdao 266111,Shandong,China;College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,Shandong,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第S02期674-680,共7页
Materials Reports
基金
国家重点研发计划(2022YFB4300102)。
关键词
界面反应
吸附能
化学吸附
聚酰胺
金属铝
interface reaction
adsorption energy
chemisorption
polyamide
metallic aluminum
