摘要
制备了一种聚酯碳硼烷胶粘剂,用IR、^1H-NMR和^13C-NMR对其结构做了分析。胶粘剂100℃固化物,二碳癸硼烷链段-C2B10H10-没有变化;450℃/1 h固化物已分解产生硼氧化物、芳环化物和碳化物。进行了TG和2 10 10DSC分析,胶粘剂固化物氮气中500℃保温30 min残留率为76%,1000℃/30 min残留率为67%,有完好的外形。对于钛合金、石墨、不锈钢和碳耐高温材料,粘接件在500~800℃有2 MPa左右的拉剪强度。铝合金/镀铜聚酰亚胺薄膜粘接件和复合材料在150~200℃共固化时,不会脱粘,拉剪强度较高。胶粘剂耐温性起源于B-C、B-O键的高键能,碳硼烷的电子和立体结构,高温分解生成B-O键产物,高温加热进一步交联。胶粘剂可以用作耐高低温材料。
A carborane-containing polyester based polyurethane adhesive was prepared and its molecular structure was characterized by IR,^1H NMR and ^13C NMR. For the cured adhesive at 100℃,the chain segment dicarbadodecaborane- C2B10H10- had no chemical change.The pyrolysis of adhesive in air at 450℃ for 1 h produced theboronic oxides,aryl ring compounds and carbides.Having the integral outer shape,the residual of adhesive in N2 at 500℃ for 30 min and at 1 000℃ for 30 min were 76%(w) and 67%(w), respectively, by TG and DSC analysis.Bonding high temperature-resistant materials such as titanium,graphite,stainless steel and carbon composite,the bonded pieces had the lap shear strength of 2 MPa at 500-800 ℃.Cocured with composite at 150-200℃, the bonded piecess ofAl-(Cu-plated) polyimide thin film-Al had no debonding and gave higher lap shear strength.The high temperature-resistance of adhesive ascribes to the high energies of B-C, B-O bonds,electric and steric structures of carboranes,pyrolysis products of boronic oxides and further crosslinking during high temperature heating.
出处
《粘接》
CAS
2014年第12期32-37,41,共7页
Adhesion
关键词
碳硼烷
聚氨酯
胶粘剂
制备
耐高温
caborane
polyurethane
adhesives
preparation:high temperature-resistance