纤维素纳米晶/氧化锌杂化材料的结构设计及其生物聚酯膜的改性研究-文献详情-维普官网

文献检索

任意字段

文献信息

任意字段
主题词
篇关摘
篇名
关键词
摘要
作者
第一作者
作者单位
刊名
中图分类号
学科分类号
DOI
基金

智能检索

高级检索

检索历史

纤维素纳米晶/氧化锌杂化材料的结构设计及其生物聚酯膜的改性研究认领

作者：

Somia Yassin Hussain Abdalkarim

学位授予单位：

浙江理工大学

摘要：

Biodegradable polyesters are a relevant candidate in the field of biomedical applications suchas drug delivery, wound dressings, tissue engineering owing to their suitable properties to supportcellular growth and proliferation.However, the applications of biodegradable polyesters in thebiomedical are limited due to their low degradation rate, uncontrollable degradation for manyclinical applications, poor mechanical and thermal properties.Therefore by understanding thecombined effects of inorganic ZnO nanoparticles and biomass cellulose nanocrystals (CNCs) frommost abundant natural cellulose resources as UV absorber and antibacterial agents into biopolyesterespecially (poly (3-hydroxybutyrate-co-3-hydroxy valerate, PHBV) matrix with or without theaddition of polyethylene glycol (PEG) as organic phase change materials could provide newprospects to the sustainable use of nanotechnology and nanocomposites with improvement in thethermal and mechanical properties for potential applications in antibacterial wound dressings, UVshielding materials, drug delivery, and thermal energy storages fields.In this dissertation, a seriesof ultra-high performance biopolyester nanocomposites were successfully fabricated by welldispersed of CNC-ZnO nanohybrids with modulated contents as nanofillers into bio-polyester(poly (3-hydroxybutyrate-co-3-hydroxy valerate, PHBV) matrix.The impact of nanofillerscontent and fabrication techniques on their structures designs and properties were discussed indetails.This research can provide a theoretical basis and technical guidance for the preparation andfabrication of these novel biopolyester nanocomposites with multi-functional properties forpotential uses as biomedical biomaterials.The main results are summarized as follows:　　1) Green synthesis of sheet-like cellulose nanoerystal-zinc oxide nanohybrids withmultifunctional performance through one-step hydrothermal method.In this study, wereport novel sheet-like cellulose nanocrystal-zinc oxide nanohybrids (CNC-ZnO) by using aone-step hydrothermal method.Various concentrations of Zn2+ ions were functionalized inCNC surface and a possible mechanism for the formation of CNC-ZnO nanohybrids withhexagonal sheet-like structure converted to the flower-like structure was also presented.　　Additionally, the sheet-like CNC-ZnO5.0 showed good antimicrobial activity, excellentthermal stability and high photocatalytic activity of 95.21％ of MB dye was decomposed after200 min under UV light irradiation.More significantly, the CNC-ZnO5.0 nanohybrid can berecycled three times with good Turnover frequency values (TOF).Compared to pure CNC, themaximum degradation temperature (Tmax) of sheet-like nanocrystal-Zinc oxide nanohybridwith the addition of 5 mmol Zn2+ ions (CNC-ZnO50) nanohybrid was improved by 23.1 ℃,and its limiting oxygen index increased up to 49.6％.This work provides a simple preparationprocedure of sheet-like CNC-ZnO nanohybrids with good antimicrobial, photocatalytic andthermal properties for attractive applications as biomedical materials and flame-retardants.　　2) Sheet-like cellulose nanocrystal-ZnO nanohybrids as multifunctional reinforcing agentsin biopolyestercomposite nanofibers with ultrahigh UV-Shielding and antibacterialperformanees.The uses of inorganic metal oxide and ZnO nanohybrids as UV absorbershave potential to increase the production of UV-protective textile, which will also overcomethe drawbacks of organic molecules and prevent negative impacts on human health andenvironment.In this work, sheet-like cellulose nanocrystal-Zinc oxide (CNC-ZnO)nanohybrid was successfully developed by a one-step hydrothermal method.The obtainedCNC-ZnO nanohybrids as UV absorber and antibacterial agents were introduced intobiopolyester (poly (3-hydroxybutyrate-co-3-hydroxyvalerate, PHBV) by usingelectrospinning process.The addition of sheet-like CNC-ZnO can greatly enhance PHBVthermal stability and crystallization ability.In addition, excellent antimicrobial ratios ofEscherichia coli and Staphylococcus aureus, and high absorbency of solution A (9.82 g/g)were obtained for the composite nanofibers with 5 wt ％ CNC-ZnO.Moreover, most of theUV irradiations were blocked out for both UVA (99.72％) and UVB (99.95％) with high UPFvalue of 1674.9 in the resulting composite nanofibers with 9 wt ％ CNC-ZnO.This studyprovides a novel method to produce sheet-like CNC-ZnO with multifunctional properties andits nanocomposite for potential uses as wound dressings and other functional biomaterials.　　3) In vitro degradation and possible hydrolytic mechanism of PHBV nanocomposites byincorporating cellulose nanocrystal-ZnO nanohybrids.Fabrication and characterization ofbiodegradable nanocomposites based on poly (3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBV) matrix reinforced with cellulose nanocrystal (CNC-ZnO) nanohybrids via simplesolution casting process for possible use as antibacterial biomedical materials is reported.Theobtained nanocomposites exhibited good antibacterial ratio of 95.

摘要译文

关键词：

纤维素纳米晶; 氧化锌; 杂化材料; 结构设计; 生物聚酯膜; 改性机理

学位年度：

2018

学位类型：

博士

学科专业：

Textile Engineering

导师：

姚菊明

中图分类号：

R318.08[生物材料学];TQ323.4[聚酯树脂及塑料⑨]

学科分类号：

080502[材料物理与化学];080506[纳米材料技术];080501[材料学];081702[化学工艺]