阅读说明：本技术 用于3d打印的改进的长丝 (Improved filaments for 3D printing ) 是由 D·J·加德纳 L·王 J·E·桑德斯 于 2018-11-15 设计创作，主要内容包括：本文提供了用于包括聚丙烯的材料的改进的3D打印材料、方法和系统。在一些实施方式中,本公开提供了一种用于改进的3D打印的复合材料,其包括聚合物基体和多种纤维。例如,所述聚合物基体可以具有如下组合物,所述组合物包括聚丙烯(PP)和聚乙烯(PE)(例如,高密度聚乙烯(HDPE)、低密度聚乙烯(LDPE)、线性低密度聚乙烯(LLDPE))的聚合物共混物、抗冲改性聚丙烯共聚物和/或具有多种纤维的聚丙烯无规共聚物。在一些实施方式中,所述多种纤维包括纤维素纳米纤维(例如天然纤维素纳米纤维,例如纤维素纳米原纤维)。在一些实施方式中,通过熔融配混聚合物基体(例如,PP共聚物和/或PP/PE粒料)和多种纤维并挤出混合物,从而由所述复合材料来制备长丝。(Provided herein are improved 3D printed materials, methods, and systems for materials including polypropylene. In some embodiments, the present disclosure provides a composite for improved 3D printing comprising a polymer matrix and a plurality of fibers. For example, the polymer matrix may have a composition comprising a polymer blend of polypropylene (PP) and Polyethylene (PE) (e.g., High Density Polyethylene (HDPE), Low Density Polyethylene (LDPE), Linear Low Density Polyethylene (LLDPE)), an impact modified polypropylene copolymer, and/or a polypropylene random copolymer having a plurality of fibers. In some embodiments, the plurality of fibers comprises cellulose nanofibers (e.g., natural cellulose nanofibers, such as cellulose nanofibrils). In some embodiments, filaments are prepared from the composite by melt compounding a polymer matrix (e.g., PP copolymer and/or PP/PE pellets) and a plurality of fibers and extruding the mixture.)