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Biocomposites of Polylactic Acid Reinforced by DL-Lactic Acid-Grafted microfibrillated cellulose

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Journal of Renewable Materials 2022年第11期10卷 2961-2972页

作者： Chaodong Liu Yutong Yang Boyu Cui Weihong Wang Key Laboratory of Bio-Based Material Science and Technology(Ministry of Education) Material Science and Engineering CollegeNortheast Forestry UniversityHarbin150040China

microfibrillated cellulose(MFC)is often added to polylactic acid(PLA)matrixes as a reinforcing filler to obtain fully-biodegradable composites with improved mechanical ***,the incompatibility between MFC and the PLA matrix limits the mechanical performance of MFC-reinforced PLA *** this paper,DL-lactic acid-grafted-MFC(MFC-g-DL)was used to improve the compatibility with *** composites were prepared by melt extrusion and hot-cold *** tensile strength of the PLA/MFC-g-DL composite increased by 22.1%compared with that of PLA after adding 1%*** electron microscopy(SEM),differential scanning calorimetry(DSC),and dynamic thermomechanical analysis(DMA)were used to explore the enhancement *** energy dissipation in the MFC network and the improved compatibility between PLA and MFC-g-DL played important roles in the *** SEM results showed that there was a closer combination between PLA and *** DSC results showed that the addition of cellulose changed the glass transition temperature,melting temperature,and crystallization temperature of *** TG results showed that the initial and maximum decomposition temperature were lower than those of *** ultraviolet spectra showed that the composite had good transparency at a low concentration of MFC-g-DL.

关键词： Polylactic acid microfibrillated cellulose tensile properties transparency

Fast self-assembled microfibrillated cellulose@MXene film with high-performance energy storage and superior mechanical strength

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Chinese Chemical Letters 2021年第11期32卷 3575-3578页

作者： Zhirong Zhang Zhongping Yao Zhaohua Jiang School of Chemistry and Chemical Engineering State Key Laboratory of Urban Water Resource and EnvironmentHarbin Institute of TechnologyHarbin 150001China

The trade-off between the electrochemical performance and mechanical strength is still a challenge for Ti_(3)C_(2)T_(x)free-standing ***,a facile approach was proposed to fabricate a microfibrillated cellulose@Ti_(3)C_(2)T_(x)(MFC@Ti_(3)C_(2)T_(x))self-assembled microgel film by means of hydrogen bonding *** from the rich hydroxyl groups on the MFC,the Ti_(3)C_(2)T_(x)nanosheets coated on the MFC in a time scale of minutes(within 1 min)instead of *** ultralong 1D frame of MFC effectively mitigated the re-aggregation of Ti_(3)C_(2)T_(x)*** fluffy MFC@Ti_(3)C_(2)T_(x)film structure and the constructed 1D/2D conducting Ti_(3)C_(2)T_(x)pathways in horizontal and vertical directions endowed the fast ion transport of the electrolytes and the improved accessibility to the Ti_(3)C_(2)T_(x)*** a result,the freestanding MFC@Ti_(3)C_(2)T_(x)microgel film delivered a high specific capacitance of 451F/*** the rate performance was increased to 71%from the 64%of that of pristine Ti_(3)C_(2)T_(x)***,the tensile strength of MFC@Ti_(3)C_(2)T_(x)film was also promoted to 46.3 MPa,3 folds of that of the pristine Ti_(3)C_(2)T_(x)film,due to the high strength of MFC and the hydrogen bonding effect.

关键词： MXene microfibrillated cellulose Supercapacitor Self-assemble Microgel

Effect of Y-Methacryloxypropyltrimethoxysilane (MPS) and Tetraethoxysilane (TEOS) Towards Preparation of Oil Absorbent Foams from Polyvinyl Alcohol (PVA) Reinforced with microfibrillated cellulose (MFC)

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Journal of Renewable Materials 2020年第7期8卷 739-757页

作者： Dzun Noraini Jimat Sharifah Shahira Syed Putra Parveen Jamal Wan Mohd Fazli Wan Nawawi Mohammed Saedi Jami Department of Biotechnology Engineering Kulliyyah of EngineeringInternational Islamic University MalaysiaKuala Lumpur50728Malaysia

Increasing usage of foams in various industry sectors had causing serious disposal problems once it reaches the end of its ***,PVA-MFC foam was prepared by freeze-drying using polyvinyl alcohol(PVA)and microfibrillated cellulose(MFC)as a reinforced material from sugarcane bagasse(SCB).In this study,the PVA-MFC foam was chemically silylated with Y-methacryloxypropyltrimethoxysilane(MPS)and tetraethoxysilane(TEOS).The wetting ability and mechanical strength of the silylated_(2,20)PVA-MFC foam was greatly enhanced compared with unmodified_(2,20)PVA-MFC *** silane chemicals(MPS and TEOS)had been confirmed grafted on_(2,20)PVA-MFC foam due to the presence of Si-C and Si-O-C stretching vibration as showed in Fourier Transform Infrared(FTIR)spectra and cloud-like coating of porous pore was observed in scanning electron microscopy(SEM)*** silylated_(2,20)PVA-MFC foam(MPS and TEOS)exhibited a series of desirable properties such as lower swelling ratio and high absorption capacity of solvents and oils but had low thermal stability in thermogravimetric(TGA)*** characterization of_(2,20)PVA-MFC foam using TEOS was further investigated.A significant difference in morphology was clearly observed between the unmodified and silylated_(2,20)PVA-MFC-TEOS foam through field emission scanning electron microscopy(FESEM)*** X-ray photoelectron(XPS)analysis of silylated_(2,20)PVA-MFC-TEOS foam confirmed the presence of C,O and trace amount of Si *** synthesized_(2,20)PVA-MFC foam could be a promising material for broad range of polymer foam applications.

关键词： Polyvinyl alcohol foam microfibrillated cellulose sugarcane bagasse Y-methacryloxypropyltrimethoxysilane tetraethoxysilane and oil absorbent

Lignin-containing microfibrillated cellulose Prepared from Corncob Residue via Calcium Hydroxide Co-grinding and Its Application in Paper Reinforcement

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Paper And Biomaterials 2022年第2期7卷 37-45页

作者： Jinghuan Chen Jingang Liu Zehong Xu China National Pulp and Paper Research Institute Co. Ltd.Beijing100102China National Engineering Lab for Pulp and Paper Beijing100102China

In this study,lignin-containing microfibrillated cellulose(MFC)was prepared from corncob residue after xylose extraction via co-grinding with calcium *** product was then compared with the MFC obtained by direct grinding and applied to strengthen *** chemical composition and morphological structure analysis results showed that the corncob residue can be used to prepare lignin-containing MFC and does not require further ***,the co-grinding with calcium hydroxide is easier to fibrillate corncob *** MFC obtained by cogrinding with calcium hydroxide had a higher aspect ratio,and its surface was coated with calcium carbonate *** obtained by both the methods mentioned above had an obvious strengthening effect on *** with the paper without MFC,the tensile index,elongation,burst index,and folding strength of the paper with MFC obtained by co-grinding with calcium hydroxide significantly increased by 17.5%,22.1%,19.5%,and 157.1%,*** study provides a novel idea for the utilization of corncob residue,which may enhance the value and promote the comprehensive utilization of corn by-products.

关键词： corncob residue microfibrillated cellulose calcium hydroxide co-grinding paper reinforcement

Different Kinds of microfibrillated cellulose as Coating Layers Providing Fiber-based Barrier Properties

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Paper And Biomaterials 2021年第1期6卷 33-40页

作者： Ruijuan Zhang Yanqun Su Jingang Liu China National Pulp and Paper Research Institute Co. Ltd.Beijing100102China National Engineering Lab for Pulp and Paper Beijing100102China

In this study,we investigated the barrier properties of different kinds of microfibrillated cellulose(MFC)coating *** air,oxygen,and water vapor permeability,as well as the water contact angles(WCA),were measured to quantify the barrier efficacy of the applied *** WCA data showed that the surfaces of MFC-coated cardboards are more hydrophilic than those of uncoated ***,different MFC coatings realize different oxygen transmission rates(OTRs)and water vapor transmission rates(WVTRs).The MFC coating derived from bleached bamboo pulp subjected to carboxyethylation pretreatment(MFCCBP)gave the best oxygen and water vapor barrier *** OTR of the virgin cardboard(>16500 cm^(3)/(m^(2)·24 h))decreased to 4638 cm^(3)/(m^(2)·24 h)after coating with the *** WVTR similarly decreased from 1016.7 g/(m^(2)·24 h)to 603.2 g/(m^(2)·24 h).

关键词： microfibrillated cellulose coating performance surface properties barrier properties

Preparation and Application of microfibrillated cellulose-modified Ground Calcium Carbonate

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Paper And Biomaterials 2017年第3期2卷 18-27页

作者： Xia Lv YanQun Su JinGang Liu China National Pulp and Paper Research Institute Beijing100102China National Engineering Lab for Pulp and Paper Beijing100102China

microfibrillated cellulose(MFC) was first prepared by 2,2,6,6-tetramethylpiperidine-1-oxyl(TEMPO) oxidation pretreatment and mechanical grinding in the presence of a certain amount of ground calcium carbonate(GCC).The effects of GCC dosage and grinding concentration on the fibrillation were *** obtained MFC was then added to the bulk GCC to form MFC-modified GCC *** properties of MFCmodified GCC fillers were compared to those of the traditional GCC *** showed that the resulting fibrils became more uniform when the dosage of GCC was 10%~15% and the concentration of the suspension was 6.97%.Compared to traditional GCC,the average particle size of the MFCmodified GCC fillers was *** electron microscopy images showed that GCC and MFC formed a bridge structure in the MFC-modified GCC *** the process of papermaking,the MFC-modified GCC fillers decreased the drainage rate but increased the retention of *** prepared papers filled with MFC-modified GCC fillers had higher tensile strength than those filled with traditional GCC fillers.

关键词： microfibrillated cellulose GCC grinding modified filler

Effect of microfibrillated cellulose(MFC)on the properties of gelatin based composite films

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Journal of Bioresources and Bioproducts 2018年第3期3卷 107-111页

作者： Shuaishuai Yang Haichao Li Huizhen Sun College of Chemistry and Chemical Engineering Qinghai Nationalities UniversityXining 810007China Center of Ecology Research Northeast Forestry UniversityHarbin 150040China

Properties of gelatin composite films(with 4%glycerol as plasticizer)with different mass concentrations of microfibrillated cellulose(MFC)(0.2-1.0%)were *** prepared composite films with 1.0%MFC showed the highest tensile strength(12.32 MPa)with the lowest water absorption rate(391.1%).The composite films can be dissolved in hot water of 95℃ in less than 5 ***,the addition of MFC had insignificant effect on the heat shrinkage and light transmittance of the resultant composite films.

关键词： Gelatin films microfibrillated cellulose Physicochemical properties

Effects of MFC-modified GCC as Filler on the Opacity of Pulp Handsheets

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Paper And Biomaterials 2020年第3期5卷 62-69页

作者： Yanqun Su Junjie Liu Jingang Liu Ruijuan Zhang Jinghuan Chen Yanfen Du China National Pulp and Paper Research Institute Co. Ltd.Beijing100102China National Engineering Laboratory for Pulp and Paper Beijing100102China

microfibrillated cellulose(MFC)was obtained by mechanical grinding of different ***-modified ground calcium carbonate(GCC)was prepared in two different ways,designated MFC-GCC composite filler and MFC-GCC flocs *** opacity of pulp handsheets loaded with MFCmodified GCC was *** effects of MFC originated from different pulps,pretreatment method,and filler modification on the opacity of handsheets loaded with MFC-modified GCC were *** results show that MFC originated from alkaline peroxide mechanical pulp(APMP)was optimal for improving the opacity of the handsheets and PFI grinding pretreatment for MFC provided a denser structure in the corresponding MFCAPMP-GCC floc filler while enzyme pretreatment was more effective in increasing the opacity of the filled *** the experimental conditions,the opacity of handsheets increased from 81.0%to 82.7%when the unmodified GCC was replaced by an equivalent amount of MFCAPMP-GCC composite filler,while other properties were unchanged.

关键词： microfibrillated cellulose ground calcium carbonate modification opacity

Preparation and Characterization of Novel Nanocellulose/PLA Composites Via Aerogel Procedures

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Preparation and Characterization of Novel Nanocellulose/PLA ...

作者： Elmira Zarei 浙江大学

学位级别：硕士

At present there is significant interest for the development of environmentally friendly polymers and polymer based composites from renewable resources. Worries about greenhouse gas emissions produced by using fossil fuel composed with low degradability of polymers derived from fossil fuel has led to increase in research to develop degradable polymers and composites. Poly(lactic acid) and cellulose are two such examples of degradable polymers that come from renewable *** production of nanocellulose with controlled structure from plant resources with facile availability and well sustainability in purpose of application of suitable material for various biomedical applications and energy storage devices is very important in science and engineering. Up to now, many methods for isolating nanocellulose from various plant fibers such as mechanical and chemical procedures had been explored. Furthermore, in recent years, natural fiber reinforced biopolymer nanobiocomposites have attracted great interest, both in academia and industry. In this case, the most important factor in obtaining good fiber reinforcement in the composite is the strength of adhesion between the matrix polymer and the fiber which can be effect on their properties. Whereas the main drawbacks of natural fiber reinforced polymer composites are their hydrophilicity, low weathering resistance that adversely affect the fiber/matrix interface and leads to degradation, and delamination of composites. Since, fibers are hydrophilic in nature, therefore, are inherently incompatible with many well-known and popular in composite manufacturing resins such as PLA. Overall, the main objective is to develop an understanding for relationships between processing, different kinds of material, different concentration of PLA to produce nano/micro cellulose composites and properties of the resulting materials in order to assess the potential of these new nontoxicity, biocompatibility, and biodegradability materials.

关键词： nanofibrillated cellulose microfibrillated cellulose nanocellulose/PLA composite poly(lactic acid) freeze-drying