双向自增强PE-HD管材的制备及其增强效果的研究

利用自行设计制造的剪切拉伸双向复合应力场挤管装置制备了轴、周向同时获得自增强的高密度聚乙烯管材。采用万能电子拉力试验机和差示扫描量热仪（DSC）对增强效果及其原因进行了研究。结果表明，剪切拉伸双向复合应力场不仅能明显改善管材轴、周向的力学性能，而且能提升管材的结晶度，其轴向拉伸强度最高提高到30.56 MPa，提高了36.6 %,周向拉伸强度最高提高到33.5 MPa，提高了54.6 %，轴向拉伸模量最高提高到180.3 MPa，提高了47.4 %，周向拉伸模量最高提高到529.8 MPa，提高了140.7 %，结晶度提高了13.51 %，熔点提升了1.5 ℃。DSC测试结果表明，管材性能改善的原因是其结晶度的提高所致。

Preparation and Self-reinforcement Effect of Two-dimension Self-reinforced PE-HD Pipes

Two-dimension self-reinforced PE-HD pipe was prepared using home-made equipment, which was subsequently studied using tensile tester and differential scanning calorimetry (DSC). The axial and circular strength reached 30.56 and 33.5 MPa, 36.6 and 54.6 % higher than those of regular pipe. The axial and circular moduli reached 180.3 and 529.8 MPa, 47.4 and 140.7 % higher than those of regular pipe. DSC showed the degree of crystallinity was improved by 13.51 % and its melting point was improved by 1.5 ℃.