THE TRANSVERSE STRENGTH OF ACRYLIC RESIN STRIPS AND OF REPAIRED ACRYLIC SAMPLES
THE TRANSVERSE STRENGTH OF ACRYLIC RESIN STRIPS AND OF REPAIRED ACRYLIC SAMPLES
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DOI：
10.1111/j.1365-2842.1984.tb00573.x
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发表时间：
1984-01-01
影响因子：
2.9
通讯作者：
GOULTSCHIN, J
中科院分区：
文献类型：
--
作者：
GRAJOWER, R;GOULTSCHIN, J
提出了一种测量修复后亚克力试件在单对接处横向强度的方法。对两种热聚合树脂和两种修复树脂制备的样品进行了强度测定。测定了修复树脂固化过程中的温度升高。通过将样品浸泡在溶剂中来评估树脂的交联性。经各种处理后的珠状微观结构的出现被认为是样品表面松弛的标志。热聚合树脂的修复样品在浸泡在单体中后表现出松弛，其强度低于未观察到松弛的树脂制备的样品，尽管两种树脂的交联程度相似。在固化过程中施加压力增加了用快速固化交联修复树脂修复的样品的强度。只有当修复树脂在混合后延迟插入样品部件之间时，用非交联、缓慢固化的修复树脂修复的样品的强度才会受到压力的影响。非交联修复树脂粉液比的变化不影响样品强度。修复前单体对样品部件的润湿和固化温度的变化对所研究的树脂组合的样品强度没有影响。
A method was developed for measuring the transverse strength of repaired acrylic samples at a single butt joint. The strength was determined for samples prepared from two types of heat polymerizing resins and two types of repair resins. The temperature elevation during curing of the repair resins was determined. Cross‐linking of the resins was evaluated by immersion of samples in solvents. The appearance of the bead microstructure after various treatments was considered to indicate relaxation at the sample surface. Repaired samples of the heat polymerizing resin which exhibited relaxation after immersion in monomer, had a lower strength than samples prepared from the resin for which relaxation was not observed, although both resins were cross‐linked to a similar extent. The application of pressure during curing increased the strength of the samples repaired with the rapid curing, cross‐linked, repair resin. The strength of the samples repaired with the uncross‐linked, slow curing, repair resin was affected by pressure only if the insertion of the repair resin between the sample parts was delayed after mixing. Variations in the powder to liquid ratio of the uncross‐linked repair resin did not affect the sample strength. Wetting of the sample parts with monomer before repair, and variations in the curing temperature did not affect the sample strength for the investigated resin combinations.