Low-basis-weight paper lacks normal strength and stiffness. Waterborne epoxy resin could be employed with oxidized starch to improve paper stiffness through surface sizing. In this study,the mechanism of enhancing sti...Low-basis-weight paper lacks normal strength and stiffness. Waterborne epoxy resin could be employed with oxidized starch to improve paper stiffness through surface sizing. In this study,the mechanism of enhancing stiffness by adding waterborne epoxy resin was fully investigated. The results indicated that through surface sizing with epoxy resin,the paper thickness was preserved,whereas the elastic modulus increased significantly and the epoxy resin had positive impact on single fiber strength. A rigid resin layer and interpenetrating polymer network formed on the surface and in the inner layer of the paper,respectively. The formed resin layer and interpenetrating polymer network strongly supported the paper,leading to the improvement of the elastic modulus and stiffness. The stiffness improvement through surface sizing was mainly due to the formation of a fibrous composite layer and penetration of the sizing agent into the inner layers of the paper. The better the combination between fiber and sizing agent,the higher were the elastic modulus and the stiffness of the whole paper.展开更多
A multi-functional porous paper-based material was prepared from grass pulp by simple pore-forming and green cross-linking method.As a pore-forming agent,calcium citrate increased the porosity of the paper-based mater...A multi-functional porous paper-based material was prepared from grass pulp by simple pore-forming and green cross-linking method.As a pore-forming agent,calcium citrate increased the porosity of the paper-based material from 30%to 69%while retaining the mechanical strength.The covalent cross-linking of citric acid between cellulose fibers improved both the wet strength and adsorption capacity.In addition,owing to the introduction of high-content carboxyl groups as well as the construction of hierarchical micro-nano structure,the underwater oil contact angle was up to 165°.The separation efficiency of the emulsified oil was 99.3%,and the water flux was up to 2020 L·m^(–2)·h^(–1).The theoretical maximum adsorption capacities of cadmium ion,lead ion and methylene blue reached 136,229 and 128.9 mg·g^(–1),respectively.The continuous purification of complex wastewater can be achieved by using paper-based materials combined with filtration technology.This work provides a simple,low cost and environmental approach for the treatment of complex wastewater containing insoluble oil,organic dyes,and heavy metal ions.展开更多
基金financially supported by the National Natural Science Funds of China(grant number31470599)the Priority Academic Program Development of Jiangsu Higher Education Institutions,China
文摘Low-basis-weight paper lacks normal strength and stiffness. Waterborne epoxy resin could be employed with oxidized starch to improve paper stiffness through surface sizing. In this study,the mechanism of enhancing stiffness by adding waterborne epoxy resin was fully investigated. The results indicated that through surface sizing with epoxy resin,the paper thickness was preserved,whereas the elastic modulus increased significantly and the epoxy resin had positive impact on single fiber strength. A rigid resin layer and interpenetrating polymer network formed on the surface and in the inner layer of the paper,respectively. The formed resin layer and interpenetrating polymer network strongly supported the paper,leading to the improvement of the elastic modulus and stiffness. The stiffness improvement through surface sizing was mainly due to the formation of a fibrous composite layer and penetration of the sizing agent into the inner layers of the paper. The better the combination between fiber and sizing agent,the higher were the elastic modulus and the stiffness of the whole paper.
基金The support of this work by the National Key Research and Development Program of China(Grant No.2019YFC19059003)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)is gratefully acknowledged.
文摘A multi-functional porous paper-based material was prepared from grass pulp by simple pore-forming and green cross-linking method.As a pore-forming agent,calcium citrate increased the porosity of the paper-based material from 30%to 69%while retaining the mechanical strength.The covalent cross-linking of citric acid between cellulose fibers improved both the wet strength and adsorption capacity.In addition,owing to the introduction of high-content carboxyl groups as well as the construction of hierarchical micro-nano structure,the underwater oil contact angle was up to 165°.The separation efficiency of the emulsified oil was 99.3%,and the water flux was up to 2020 L·m^(–2)·h^(–1).The theoretical maximum adsorption capacities of cadmium ion,lead ion and methylene blue reached 136,229 and 128.9 mg·g^(–1),respectively.The continuous purification of complex wastewater can be achieved by using paper-based materials combined with filtration technology.This work provides a simple,low cost and environmental approach for the treatment of complex wastewater containing insoluble oil,organic dyes,and heavy metal ions.
