Vlad-Bubulac Tăchiță, Hamciuc Corneliu, Serbezeanu Diana, Suflet Dana Mihaela, Rusu Daniela, Lisa Gabriela, Anghel Ion, Preda Dana-Maria, Todorova Totka, Rîmbu Cristina Mihaela
"Petru Poni" Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania.
Department of Chemical Engineering, Faculty of Chemical Engineering and Environmental Protection, "Gheorghe Asachi" Technical University of Iasi, 73 Bd. Mangeron, 700050 Iasi, Romania.
Polymers (Basel). 2023 Jun 4;15(11):2573. doi: 10.3390/polym15112573.
The sustainable development of innovative eco-friendly multifunctional nanocomposites, possessing superior characteristics, is a noteworthy topic. Novel semi-interpenetrated nanocomposite films based on poly(vinyl alcohol) covalently and thermally crosslinked with oxalic acid (OA), reinforced with a novel organophosphorus flame retardant (PFR-4) derived from co-polycondensation in solution reaction of equimolar amounts of co-monomers, namely, bis((6-oxido-6H-dibenz[c,e][1,2]oxaphosphorinyl)-(4-hydroxyaniline)-methylene)-1,4-phenylene, bisphenol S, and phenylphosphonic dichloride, in a molar ratio of 1:1:2, and additionally doped with silver-loaded zeolite L nanoparticles (ze-Ag), have been prepared by casting from solution technique. The morphology of the as prepared PVA-oxalic acid films and their semi-interpenetrated nanocomposites with PFR-4 and ze-Ag was investigated by scanning electron microscopy (SEM), while the homogeneous distribution of the organophosphorus compound and nanoparticles within the nanocomposite films has been introspected by means of energy dispersive X-ray spectroscopy (EDX). It was established that composites with a very low phosphorus content had noticeably improved flame retardancy. The peak of the heat release rate was reduced up to 55%, depending on the content of the flame-retardant additive and the doping ze-Ag nanoparticles introduced into the PVA/OA matrix. The ultimate tensile strength and elastic modulus increased significantly in the reinforced nanocomposites. Considerably increased antimicrobial activity was revealed in the case of the samples containing silver-loaded zeolite L nanoparticles.
具有卓越特性的创新型环保多功能纳米复合材料的可持续发展是一个值得关注的话题。基于聚乙烯醇（PVA）与草酸（OA）通过共价键和热交联形成的新型半互穿纳米复合薄膜，用一种新型有机磷阻燃剂（PFR - 4）增强，该阻燃剂由等摩尔量的共聚单体在溶液反应中共缩聚得到，即双（（6 - 氧化 - 6H - 二苯并[c,e][1,2]氧磷杂环戊烯基） - （4 - 羟基苯胺） - 亚甲基） - 1,4 - 亚苯基、双酚S和苯基膦酸二氯，摩尔比为1:1:2，并且额外掺杂了载银沸石L纳米颗粒（ze - Ag），通过溶液浇铸技术制备而成。通过扫描电子显微镜（SEM）研究了所制备的PVA - 草酸薄膜及其与PFR - 4和ze - Ag的半互穿纳米复合材料的形态，同时借助能量色散X射线光谱（EDX）考察了有机磷化合物和纳米颗粒在纳米复合薄膜中的均匀分布情况。结果表明，磷含量极低的复合材料具有显著提高的阻燃性。热释放速率峰值降低了高达55%，这取决于阻燃添加剂的含量以及引入PVA/OA基体中的掺杂载银沸石L纳米颗粒。增强后的纳米复合材料的极限拉伸强度和弹性模量显著提高。在含有载银沸石L纳米颗粒的样品中，抗菌活性显著增强。
