Khan Sadaf Bashir, Li Nan, Liang Jiahua, Xiao Chuang, Sun Xiaohong, Chen Shenggui
Dongguan University of Technology, Dongguan 523808, China.
School of Art and Design, Guangzhou Panyu Polytechnic, Guangzhou 511483, China.
Nanomaterials (Basel). 2022 Jul 26;12(15):2566. doi: 10.3390/nano12152566.
Despite the large number of studies addressing the effect of acrylic resin polymerization concerning flexural properties, limited research has been conducted on the manufacturing impact on a polymer's mechanical properties. Photosensitive resinous materials are used in various engineering applications where they may be exposed to multiple detrimental environments during their lifetime. Therefore, there is a need to understand the impact of an environment on the service life of resins. Thus, flexural tests were conducted to study the effects of exposure time and angle on the flexural strength of resins. Herein, the main objective was to explore the strength, stability, and flexural durability of photosensitive resin (EPIC-2000ST) fabricated at different exposure times (E) and angle deviation varying from 0° to 85° with a 5° increment. The samples in circular rings were manufactured and divided into five groups according to their exposure time (E): 10 s, 20 s, 30 s, 40 s, and 50 s. In each exposure time, we designed rings via SolidWorks software and experimentally fabricated at different oblique angles (OA) varying from 0° to 85° with a 5° increment during each fabrication, i.e., OA = 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, and 85°. Flexural strength was evaluated using a three-point bending test. Optical electron microscopy was used to examines the samples' exterior, interior, and ruptured surfaces. Our experimental analysis shows that flexural strength was significantly enhanced by increasing exposure time and at higher oblique angles. However, at lower angles and less exposure time, mechanical flexural resilience declines.
尽管有大量研究探讨了丙烯酸树脂聚合对弯曲性能的影响，但关于制造过程对聚合物机械性能影响的研究却很有限。光敏树脂材料被用于各种工程应用中，在其使用过程中可能会暴露于多种不利环境。因此，有必要了解环境对树脂使用寿命的影响。于是，进行了弯曲试验以研究暴露时间和角度对树脂弯曲强度的影响。在此，主要目的是探究在不同暴露时间（E）以及角度偏差从0°到85°（以5°递增）条件下制造的光敏树脂（EPIC - 2000ST）的强度、稳定性和弯曲耐久性。制造了圆环样品，并根据暴露时间（E）将其分为五组：10秒、20秒、30秒、40秒和50秒。在每个暴露时间下，我们通过SolidWorks软件设计圆环，并在每次制造过程中以5°递增的不同倾斜角度（OA）进行实验制造，即OA = 0°、5°、10°、15°、20°、25°、30°、35° 、40°、45°、50°、55°、60°、65°、70°、75°、80°和85°。使用三点弯曲试验评估弯曲强度。利用光学电子显微镜检查样品的外部、内部和破裂表面。我们的实验分析表明，通过增加暴露时间和增大倾斜角度，弯曲强度显著提高。然而，在较小角度和较短暴露时间下，则会出现机械弯曲弹性下降的情况。
