The polypropylene used for making cigarette filters was prepared with the process of free radical graft copolymerization in order to raise the selfadhesive power and surface energy of the PP.
用自由基化学接枝共聚的方法制作聚丙烯香烟滤材，以提高其表面能，增加自粘性。
The free radical spectrometer of wood surface was studied under ambient temperatures.
本文在室温条件下对木材表面自由基波谱进行了研究。
It can reduce anaphylaxis, raise the activity of surface enzyme which may efficiently resist free radical that causes skin aging.
它可降低皮肤过敏反应，提高表面酶的活性，这种酶可以有效抑制造成皮肤老化的自由基。
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