Adhesion of polypropylene and polyethylene after plasma processing
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摘要: 采用射频辉光放电等离子体和介质阻挡放电等离子体对聚丙烯（PP）和聚乙烯（PE）进行处理后，使用聚氨酯进行粘接，并测试了混合粘合体的剪切强度。介质阻挡放电功率是100 W时，等离子体处理对混合粘合体的剪切强度无影响。介质阻挡放电的功率为200 W、处理时间20 s时，等离子体处理效果最佳，剪切强度为1.58 MPa，是未处理的混合粘合体的14.36倍。介质阻挡放电的功率是300 W时，样品在10 s内就被击穿。射频辉光放电等离子体中，使用空气处理后最大剪切强度为1.60 MPa（100 W，3 min），使用氮气处理后的最大剪切强度为1.57 MPa（200 W，3 min）。通过扫描电镜（SEM）对等离子体处理前后的PP表面形貌观察，发现未处理样品的表面比较平滑，而经等离子体放电处理后的样品表面变得疏松，出现了大量泡状物质，表面粗糙程度提高。Abstract: Polypropylene(PP) and polyethylene(PE) are treated with radio frequency(RF) glow discharge plasma and dielectric barrier discharge(DBD) plasma. Then the shear strength of the mixing adhesion of PP and PE using polyurethane as adhesive is tested. Results show that the shear strength highly increases when the DBD plasma is applied with 200 W power. The maxium shear strength after DBD plasma processing is 1.58 MPa(20 s) which is 14.36 times that of untreated samples. However, the PP and PE are burned in 10 s when the power is 300 W, and there is no change when the power is 100 W. The effect of air RF discharge with maximum shear strength of 1.60 MPa(100 W, 3 min) is nearly the same as that of N2 RF discharge with maximum shear strength of 1.57 MPa (200 W, 3 min). Through scanning electron microscope analysis, the surfaces of samples treated with plasma are rough as a result of appearance of bubbles on the surfaces whereas the surfaces of untreated samples are smooth. Therefore, the shear strength of the mixing adhesion of PP and PE increases greatly aftertreatment with DBD plasma and RF glow discharge plasma.
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Key words:
- plasma /
- polypropylene /
- polyethylene /
- radio frequency glow discharge /
- dielectric barrier discharge /
- shear strength
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