Yao Xie,Ze Ji,Somia Yassin Hussain Abdalkarim,Haicheng Huang,Khaydar E. Yunusov,Hou-Yong Yu
Although bioplastics and paper straws have been introduced as alternatives to single-use plastic straws, their potential environmental, economic, and social impacts have not been analyzed. This study addresses this gap by designing a polylactic acid layer interface adhesion on cellulose paper-based (PLA-P) composite straws by a dip molding process. This process is simple, efficient, and scalable for massive production. Optimizing key manufacturing parameters, including ice bath ultrasonic, overlapping paper strips (2 strips), winding angle (60°), soaking time (5 min), and drying temperature (50 °C), were systematically evaluated to improve straw quality and manufacturing efficiency. PLA chains were found to deposit onto the cellulose network through intermolecular interactions to form a consistent "sandwich" structure, which can improve adhesion, water resistance, and mechanical properties. Interestingly, PLA-P straws effectively decomposed in soil and compost environments, with a 35–40 % degradation rate within 4 months. Besides, PLA-P straw residues affected seed germination and plant growth, but no significant toxic effects were detected. Further, microplastics were observed in soil and plant tissues (roots, stems, and leaves), and their possible diffusion mechanisms were explored. The results of a comprehensive life cycle assessment (LCA) and cost analysis showed that the process improvements reduced the ecological footprint of PLA-P straws and showed good prospects for commercial application. The study's findings contribute to the understanding of bioplastics and paper straws in effectively reducing environmental impact and fostering sustainable development.
Poly (p-dioxane) (PPDO) as an absorbable suture exhibits good flexibility and tensile strength. Loading drugs through the immersion method will accelerate the hydrolysis of PPDO and affect its mechanical properties. In order to improve the drug loading performance of the PPDO suture and maintain its excellent mechanical stability, biodegradable material polylactic acid (PLA) was selected as the coating layer. The PLA fiber membrane with a porous structure was prepared by electrospinning, and nanosilver particles (Ag NPs) were loaded onto the membrane by in situ reaction. Subsequently, PLA@Ag and PPDO fibers were woven together to form PLA@Ag/PPDO composite yarn. The sustained-release ability, mechanical property, antibacterial, and cytotoxicity of the composite wire were further investigated. The results showed that the equilibrium release of Ag NPs from PLA@Ag/PPDO in phosphate buffer saline (PBS) was 0.84 mg/g, and the release equilibrium time was 8 h. The knotting strength of the composite wire increased by 17.8% compared to PPDO without a coating layer. Woven sutures presented significant antibacterial effects against S. aureus . The biocompatibility evaluation of human immortalized keratinocytes (HaCaT) demonstrated its safety in use. This work provides an effective technical method for the preparation of mechanically stable and functionalized absorbable sutures.
危险品化学品经营许可证（带存储）