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利用低温等离子体,以氧气为工作气体,在工作压力为20 Pa、处理功率为30 W的条件下对LDPE薄膜进行了表面改性。用接触角、FTIR ATR、DSC、SEM、AFM等手段对改性表面进行了分析。结果表明:在10 s～300 s的处理时间内,单位面积的失重率随处理时间的增加线性增大;接触角在0～20 s内随处理时间的增加显著减小,而在40 s～300 s的处理时间内并没有发生显著变化;改性后的接触角随着放置时间的推移逐渐增大;LDPE薄膜经过氧等离子体处理后能在其表面引入各种极性基团,主要是羰基、羟基和羧基;处理后薄膜的热性能(主要是结晶度)发生了改变。
LDPE thin films were surface modified with low temperature plasma and oxygen as working gas at a working pressure of 20 Pa and a processing power of 30 W. The modified surface was analyzed by means of contact angle, FTIR ATR, DSC, SEM and AFM. The results show that the weight loss rate per unit area increases linearly with the increase of treatment time from 10 s to 300 s. The contact angle decreases with the increase of treatment time within 0-20 s, 300 s processing time did not change significantly; contact angle after modification with the passage of time gradually increased; LDPE film after oxygen plasma treatment can be introduced in its surface a variety of polar groups, mainly Carbonyl, hydroxyl and carboxyl groups. The thermal properties (mainly the crystallinity) of the treated films changed.