摘要
用聚乙二醇200与TDI合成低分子量聚氨酯预聚体,与合成的端羟基不饱和聚酯树脂共混改性,制备出高拉伸强度高断裂伸长率的UPR。研究了PU含量以及UPR主链中己二酸含量对UPR拉伸性能的影响,并用扫描电镜对拉伸断面进行分析。结果表明：PU含量在7%-15%的范围内,树脂的拉伸强度和断裂伸长率都具有较高的水平,最高可以达到拉伸强度67.5 MPa,断裂伸长率6.01%;随着UPR树脂中己二酸含量的增加,PU改性树脂的拉伸强度先升高再降低,己二酸含量为20%时出现极大值,达到76.4 MPa,与改性之前相比提高128%;UPR树脂加入己二酸后,拉伸断口均为韧性断裂,并随PU含量的增大,韧性逐渐变差。
Low molecular weight polyurethane prepolymer has been synthesized with polyethylene glycol 200 and TDI,which was added into the hydroxyl terminated UPR resin.A type of high tensile strength and high elongation at break UPR resin was prepared.The tensile property of the UPR resin was researched with different weight ratio of PU.The effect of the weight ratio of adipic acid in UPR main chain was also researched.The SEM analysis of cross-section of the tensile of the UPR resin was researched.The results show that when the PU weight ratio is in a range of 7% to 15%, the tensile strength and elongation at break can reach a high level. The integrated tensile properties can reach to the tensile strength of 67.5 MPa, the elongation at break of 6.01% ; when the weight ratio of the adipic acid in UPR main chain increases, the tensile strength increases at first, then decreases. The tensile strength reaches to the peak of 76.4 MPa when the weight ratio of adipic acid is 20%. Comparing to the unmodified UPR resin, the tensile strength is improved by 128%. As the adipic acid is added into the UPR resin, the tensile fracture shows ductile fracture. The more the PU added, the less ductile the tensile fracture shows.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2009年第21期81-84,共4页
Journal of Wuhan University of Technology
关键词
高拉伸强度
高断裂伸长率
UPR
聚氨酯预聚体
high tensile strength
high elongation at break
the UPR resin
polyurethane prepolymer
