酸 Ester 动态网络用于减少Vat 3D打印制品中的机械异质
Alex Bonacini1, Elena Saccani2, Corrado Sciancalepore2
1Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124 Parma, Italy.
ACS applied polymer materials
|March 6, 2025
概括
这项研究引入了一种新的可光固化树脂用于光聚合 (VP) 3D打印. 动态酸交联可显著降低印刷零件的机械异构性,提高性和一致性.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 添加剂制造 添加剂制造 添加剂制造
背景情况:
- 瓦特光聚合 (VP) 提供了高分辨率,但受到机械异性质的影响.
- 由于取决于方向的特性,异性变异性限制了3D打印零件的性能.
研究的目的:
- 开发一种新型的可光固化树脂,用于VP3D打印,降低机械异构性.
- 为了研究动态酸盐交叉连接在增强材料特性中的作用.
主要方法:
- 通过使用自由基聚合与二博酸 (DBEDMA) 和聚 Propylene Glycol (PPGDA) 乙烯酸 (PPGDA) 的合成可光固化树脂.
- 研究材料特性包括固化动力学,收缩,粘性弹性 (压力松,爬行恢复) 和拉伸行为.
- 将最佳动态树脂 (40D60P) 与静态交联控制器 (40B60P) 进行比较.
- 使用光学显微镜分析表面形态.
主要成果:
- 动态树脂表现出快速固化,低收缩率 (5-8%) 和可调节的粘性弹性.
- 酸乙烯基转化促进了网络重组和压力消散.
- 与40B60P对照组相比,40D60P配方显示了显著降低的机械异构性.
- 拉力测试显示了更高的性和更一致的压力-应变行为跨打印方向.
- 光学显微镜显示了动态树脂的光滑表面图案.
结论:
- 酸以为基础的动态化学有效地通过减少异性质来增强VP 3D打印材料.
- 动态交叉连接允许部分拓重新排列,提高性和同位素性.
- 虽然异构性减少了,但在特定条件下,静态交叉链仍然会导致一些异构性.
- 这种方法对需要提高机械性能和VP 3D 打印一致性的应用具有前景.
相关概念视频
01:20Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview
The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
01:13Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
01:13Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism
Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.