阻断聚电解质添加剂调节粘性弹性,提高在生理温度下凝油墨的打印能力
Tobias Göckler1,2, Fahed Albreiki1, Defu Li1
1Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States.
ACS applied polymer materials
|March 14, 2024
概括
块聚电解质 (bPE) 通过增强粘度和实现自组装,提高了生物聚合物油墨的3D打印能力. 这些bPE添加剂产生稳定,可打印的油墨,适合各种应用.
科学领域:
- 生物材料科学 生物材料科学
- 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:
- 基于挤出的3D生物打印通常面临着低粘度和生物聚合物油墨在生理温度下结构稳定性差的挑战.
- 凝甲基烯酸 (GelMA) 油墨虽然可光固化,但由于在37°C时粘度不足,其打印能力有限.
研究的目的:
- 为了研究块聚电解质 (bPE) 添加剂的实用性,以提高基于挤出的生物聚合物油墨的粘度和3D打印能力.
- 为3D打印应用开发具有改进的质性和结构完整性的GelMA/bPE油墨.
主要方法:
- 将相反电荷的bPE添加到可光固化的GelMA溶液中,以诱导复杂化驱动的自我组装.
- 使用小角度X射线散射 (SAXS) 进行墨水微结构的表征.
- 风病学分析以评估剪切强度,剪切薄化,收成行为和恢复性质.
- 评估3D打印性能,包括挤出,形状忠实性和挤出后的稳定性.
主要成果:
- 与纯的GelMA油墨相比,GelMA/bPE油墨在生理温度下显著提高粘度和打印能力.
- 由bPE自组件形成的等级微结构 (堵塞的微粒或3D网络) 被SAXS证实,与改善的剪切强度和可打印性相关.
- 通过改变bPE度,可以实现调节的质性质,包括显著的产量和剪切稀释.
- 与GelMA水凝相比,光交联的GelMA/bPE水凝具有更高的剪切强度.
- 观察到优秀的打印性能,最小的膨胀,良好的形状保留,和令人满意的形状保真.
结论:
- 块聚电解质是有效的添加剂,可以提高基于挤出的生物聚合物油墨的粘度和3D打印能力.
- bPE的自组装提供了一种改善油墨整形学和由此产生的水凝机械性能的机制.
- 这种方法提供了一个实用的策略,用于开发定制的挤出油墨,用于先进的3D打印应用.
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