氩气等离子体对自凝树脂材料吸水性和溶解性的影响

将自凝树脂材料制成直径为30mm，厚为2min的圆片62块，2块作红外光谱图分析，60块作吸水率和溶解率试验。浸泡时间分别设定为1d，1周，1，6，12个月。每个浸泡时间均设对照组和实验组，每组6个标本。实验组标本作等离子体处理，设定处理功率为60w，处理时间为2min。所有标本在浸泡前、浸泡到预期时间后及干燥后称质量。计算吸水百分率和溶解百分率。结果显示自凝树脂材料表面经氩气等离子体处理后C—H结构减少；标本浸泡1个月时，实验组的吸水率低于对照组（P〈0．05）：标本浸泡1d，1周和1个月，实验组的溶解率低于对照组（P〈0．05）。提示在1个月内，氩气离子体表面处理对自凝树脂材料的吸水率和溶解率有降低效果。

Effects of Ar plasma treatment on water sorption and solubility of auto-polymerized acrylic resin

A total of 62 disk-shaped specimens in the size of 30 mm (diameter) ×2 mm (layer thickness) were made with auto-polymerized acrylic resin (2 specimens for infrared spectrum comparison and 60 specimens for tests of water sorption and solubility). Duration of Ar plasma application was 2 minutes and plasma power applied was 60 W. Storage intervals were 1 day, 1 week, 1 month, 6 months, and 12 months, separately. A control group and a corresponding experimental group were set for each storage interval, with 6 specimens per group. All specimens were weighted 3 times, i.e., initial weight; weigh after absorption of distilled water, and final weight after desiccation. Percentages of water absorption and solubility of auto-polymefized acrylic resin were calculated. Results revealed that after Ar plasma treatment, C-H structure of auto-polymerized acrylic resin was reduced; following 1-month storage interval, water absorption percentage was significantly lower in the experimental group than in the control group; following 1-day, 1-week, and 1-month storage interval, the experimental group exhibited significantly lower solubility of auto-polymerized acrylic resin, compared to the control group (P<0.05). These results indicated that within 1-month storage, Ar plasma treatment can decrease water sorption and solubility of auto-polymerized acrylic resin.