Most composites, particularly those made using thermoset resins, cannot be recycled or reused. As a result, most of them end up in landfills at the end of their useful life which is neither sustainable nor environment-friendly. Various laws enacted by Governments around the world and heightened global awareness about sustainability and global warming is changing this situation. Significant research is being conducted in developing and utilizing sustainable fibers and resins, mostly derived from plant, to fabricate ‘Green’ composites. The significant progress in the past 20 or so years in this field has led to the development of green composites with high strength or so called Advanced Green Composites. More interestingly, green composites have also acquired various different properties such as fire resistance, transparency, barrier to gases and others. The term ‘advanced’ which only included high strength and stiffness now includes all these special properties. The world is on the cusp of a major change, and once fully developed, such composites could be used in applications ranging from automobiles to sporting goods, from circuit boards to housing and from furniture to packaging. This book, by presenting the state-of-the-art developments in many aspects of advanced green composites adds significantly to the knowledge base that is critical for their success of expanding their use in applications never seen before. The chapters are written by world’s leading researchers and present in-depth information in a simple way. This provides readers and researchers the latest developments in the field of ‘Green’ resins (with ways of strengthening them), High Strength Green Fibers (including micro and nano-cellulose fibrils/fibers) and Green Composites in the first few chapters. The introductory chapter summarizes the consequences of using conventional, petroleum-based materials and the need for green composites as well as the progress being made in this field. After that the book delves in to Advanced Green Composites in a broader sense and includes chapters on High Strength Green Composites, Self-healing Green Composites, Transparent Green Composites, All-cellulose composites, Toughened Green Composites, Green Biofoams, Bioinspired Shape Memory Composites, etc. The chapters are written by the experts who are highly respected in their fields.
Preface xi 1 Introduction 1Anil N. Netravali 1.1 Introduction 2 2 Green Resins from Plant Sources and Strengthening Mechanisms 11Muhammad M. Rahman and Anil N. Netravali 2.1 Introduction 12 2.2 Green Resins from Agro-Resources 14 2.2.1 Plant Protein-Based Resins 14 2.2.2 Plant Starch-Based Resins 21 2.3 Green Resins from Microbial Fermentation 25 2.3.1 Polyhydroxyalkanoates 25 2.3.2 Pullulan 27 2.4 Green Resins Using Monomers from Agricultural Resources 29 2.5 Strengthening of Green Resins using Nano-Fillers 32 2.5.1 Inorganic Nano-Fillers 33 2.5.2 Organic Nano-Fillers 38 2.6 Conclusions 43 References 44 3 High Strength Cellulosic Fibers from Liquid Crystalline Solutions 57Yuxiang Huang and Jonathan Y. Chen 3.1 Introduction 57 3.2 Fibers from Liquid Crystalline Solutions of Cellulose Derivatives 59 3.3 Fibers from Liquid Crystalline Solution of Nonderivatized Cellulose 60 3.4 Regenerated-Cellulose/CNT Composite Fibers with Ionic Liquids 61 3.5 Future Prospects 63 Summary 64 References 65 4 Cellulose Nanofibers: Electrospinning and Nanocellulose Self-Assemblies 67You-Lo Hsieh 4.1 Introduction 68 4.2 Electrospinning of Cellulose Solutions 70 4.3 Cellulose Nanofibers via Electrospinning and Hydrolysis of Cellulose Acetate 70 4.3 Bicomponent Hybrid and Porous Cellulose Nanofibers 72 4.4 Wholly Polysaccharide Cellulose/Chitin/Chitosan Hybrid Nanofibers 74 4.5 Surface-Active Cellulose Nanofibers 76 4.6 Nanocelluloses 77 4.7 Nanocelluloses from Agricultural By-Products 79 4.8 Source Effects – CNCs from Grape Skin, Tomato Peel, Rice Straw, Cotton Linter 80 4.9 Process Effect – Nanocelluloses from Single Source (Corn Cob, Rice Straw) 83 4.10 Ultra-Fine Cellulose Fibers from Electrospinning and Self-Assembled Nanocellulose 86 4.11 Further Notes on Nanocellulose Applications and Nanocomposites 88 Acknowledgement 88 References 88 5 Advanced Green Composites with High Strength and Toughness Anil N. Netravali 975.1 Introduction 98 5.2 ‘Greener’ Composites 99 5.3 Fully ‘Green’ Composites 101 5.4 Advanced Green Composites 102 5.5 Conclusions 106 References 108 6 All-Cellulose (Cellulose–Cellulose) Green Composites Shuji Fujisawa, Tsuguyuki Saito and Akira Isogai 111 6.1 Introduction 111 6.1.1 Cellulose 111 6.1.2 Nanocelluloses for Polymer Composite Materials 112 6.1.3 All-Cellulose Composites 114 6.2 Preparation of ACCs 114 126.96.36.199 Aqueous Solvents 114 188.8.131.52 Organic Solvents 115 184.108.40.206 Ionic Liquids 115 6.2.2 Preparation of ACCs 116 220.127.116.11 One-Phase Preparation 116 18.104.22.168 Two-Phase Preparation 116 6.3 Structures and Properties of ACCs 120 6.3.1 Optical Properties 120 6.3.2 Mechanical Properties 120 6.3.3 Thermal Expansion Behavior 124 6.3.4 Gas Barrier Properties 124 6.3.5 Biodegradability 125 6.4 Future Prospects 125 6.5 Summary 126 6.6 Acknowledgements 127 References 127 7 Self-Healing Green Polymers and Composites 135Joo Ran Kim and Anil N. Netravali 7.1 Introduction 136 7.2 Types of Self-Healing Approaches Used in Thermoset Polymers 137 7.2.1 Microcapsule-Based Self-Healing System 138 22.214.171.124 Microencapsulation Techniques 139 126.96.36.199 Microcapsule Systems for Self-Healing 148 7.2.2 Vascular Self-Healing System 158 188.8.131.52 One-, Two-, or Three-Dimensional Microvascular Systems 159 7.2.3 Intrinsic Self-Healing System 161 184.108.40.206 Test Methods to Characterize Self-Healing 162 220.127.116.11 Quasi-Static Fracture Methods 163 18.104.22.168 Fatigue Fracture Methods 165 22.214.171.124 Impact Fracture Methods 166 126.96.36.199 Other Techniques 166 7.3 Self-Healing Polymers from Green Sources 167 7.3.1 Self-Healing Polymers in Biomaterials 168 7.3.2 Self-Healing Green Resins and Green Composites 170 7.4 Summary and Prospects 173 Acknowledgements 175 8 Transparent Green Composites 187Antonio Norio Nakagaito, Yukiko Ishikura and Hitoshi Takagi 8.1 Introduction 187 8.2 Cellulose Nanofiber-Based Composites and Papers 189 8.2.1 Bacterial Cellulose-Based Composites 189 8.2.2 CNF-Based Composites 191 8.2.3 Transparent Nanopapers 194 8.2.4 All Cellulose Transparent Composites 195 8.3 Chitin-Based Transparent Composites 197 8.3.1 Chitin Nanofiber-Based Composites 197 8.3.2 Micro-Sized Chitin Composites 199 8.3.3 Chitin-Chitosan Transparent Green Composites 200 8.3.4 All Chitin Nanofiber Transparent Films 202 8.4 Electronic Devices Based on CNF Films and Composites 202 8.5 Future Prospects 205 8.6 Summary 205 References 206 9 Toughened Green Composites: Improving Impact Properties 211Koichi Goda 9.1 Introduction 211 9.2 Significance of Fiber Length in Toughened Fibrous Composites 212 9.3 Impact Properties of Green Composites 217 9.3.1 Relation Between Interfacial and Mechanical Properties in Green Composites 217 9.3.2 A Pattern of Increase in Tensile Strength and Decrease in Impact Strength 221 9.3.3 Effect of Toughened Resin 226 9.3.4 Approaches to Increase Both TS and IS 227 9.4 Role of Large Elongation at Break in Regenerated Cellulose Fibers 228 9.5 Toughened Cellulose Fibers and Green Composites 231 9.5.1 Toughening Mechanism of Regenerated Cellulose Fibers 231 9.5.2 Mercerization Effect 233 9.5.3 Other Beneficial Chemical Treatments 238 9.6 Conclusions 240 Appendix 241 10 Cellulose Reinforced Green Foams 247Jasmina Obradovic, Carl Lange, Jan Gustafsson and Pedro Fardim 10.1 Introduction 248 10.2 Bio-Based Foams 249 10.2.1 Starch-Based Foams 250 10.2.2 Foams Based on Vegetable Oils 253 10.2.3 Foams Based on Poly(Lactic Acid) 255 10.3 Surface Engineering of Cellulose Fibres Used in Foams 256 10.3.1 Chemical Modifications of Cellulose Fibres 257 10.3.2 In Situ Synthesis of Hybrid Fibres 258 10.3.2.1 Topology and Particle Content on Hybrid Fibres 260 10.3.2.2 Foam Formation 262 10.3.2.3 Combustion Behavior of Foams 262 10.4 Prospects 265 10.5 Summary 266 Acknowledgements 267 References 267 11 Fire Retardants from Renewable Resources 275Zhiyu Xia, Weeradech Kiratitanavit, Shiran Yu, Jayant Kumar, Ravi Mosurkal and Ramaswamy Nagarajan 11.1 Introduction 276 11.2 Fire Retardant Additives Based on Phosphorus and Nitrogen from Renewable Resources 278 11.2.1 Nucleic Acids 279 11.2.2 Proteins Containing Phosphorus and Sulfur 286 11.2.3 Phosphorus/Nitrogen-Rich Carbohydrates 289 11.2.4 Carbohydrates 291 11.3 Natural Phenolic Compounds as Flame Retardant Additives 295 11.3.1 Lignin 296 11.3.2 Tannins 300 11.3.3 Cardanol and Polymers of Cardanol 306 11.3.4 Polydopamines 307 11.4 Other FR Materials from Renewable Sources 308 11.4.1 Chicken Eggshell 308 11.4.2 Banana Pseudostem Sap 308 11.5 Prospects 310 11.6 Summary 311 11.7 Acknowledgements 312 References 312 12 Green Composites with Excellent Barrier Properties 321Arvind Gupta, Akhilesh Kumar Pal, Rahul Patwa, Prodyut Dhar and Vimal Katiyar 12.1 Introduction 321 12.2 Biodegradable Polymers: Classifications and Challenges 323 12.2.1 Poly (lactic acid): Properties Evaluation, Modifications and its Applications 328 12.2.2 Cellulose Based Composites: Chemical Modifications, Property Evaluation, and Applications. 333 12.2.3 Chitosan Based Composites: Chemical Modifications, Properties Evaluation, and Applications 338 12.2.4 Natural Gum Based Composites: Chemical Modification, Property Evaluation and Applications 343 12.2.5 Silk Based Composites: Property Evaluation, Chemical Modifications and Applications 348 12.3 Summary 355 Acknowledgements 355 References 356 13 Nanocellulose-Based Composites in Biomedical Applications 369M. Osorio, A. Cañas, R. Zuluaga, P. Gañán, I. Ortiz and C. Castro 13.1 Introduction 370 13.2 Nanocellulose Sources and Properties 370 13.2.1 Nanocellulose Sources 370 13.2.2 Nanocellulose Characteristics as Green Material 373 13.2.3 Nanocellulose Properties for Biomedical Composites 374 188.8.131.52 Mechanical Properties 374 184.108.40.206 Morphology 375 220.127.116.11 Surface Charge 375 18.104.22.168 Conformability 378 22.214.171.124 Thermal Properties 378 126.96.36.199 Non-Toxic 379 188.8.131.52 Biocompatible or Bioactive 379 13.3 Biomedical Applications of Nanocellulose-Based Composites 379 13.3.1 Nanocellulose-Based Composites with Various Polymers 380 184.108.40.206 Polyvinyl Alcohol 380 220.127.116.11 Chitosan (Ch) 381 18.104.22.168 Acrylic Acid (AA) 382 22.214.171.124 Polyhydroxyalkanoates (PHAs) 382 126.96.36.199 Silk Fibroin 383 188.8.131.52 Polyaniline and Polypyrrole 383 184.108.40.206 Alginate 384 220.127.116.11 Collagen 384 13.3.2 Nanocellulose-Based Composites With Bioactive Ceramics 385 18.104.22.168 Hydroxyapatite (HA) 385 22.214.171.124 Iron Oxide Nanoparticles 385 126.96.36.199 Calcium Peroxide (CaO2) 386 188.8.131.52 Carbon Nanotubes 386 13.3.3 Nanocellulose-Based Composites with Metals 386 184.108.40.206 Silver Nanoparticles (Ag) 386 220.127.116.11 Gold Nanoparticles (Au) 387 13.4 Summary 387 13.5 Prospects 390 Acknowledgments 390 References 390 Index
Anil N. Netravali is the Jean and Douglas McLean Professor of Fiber Science and Apparel Design in the Department of Fiber Science and Apparel Design at Cornell University. Since 1984 he has been working in the field of polymer composites. He has published widely in the area of fiber/resin interface characterization and control through fiber surface modification and resin modification using nanoparticles and nanofibrils. In the past 25 years he has made significant contributions in the area of 'green' resins, composites and nanocomposites that are fully derived from plants. He was the recipient of the Fiber Society's Founders Award in 2012 and received the Green of the Crop award from the Creative Core (NY) in 2010.
Authoritative book edited by one of the first and leading researchers in green materials with chapters authored by renowned experts. Most composites, particularly those made using thermoset resins, cannot be recycled or reused. As a result, most of them end up in landfills at the end of their useful life which is neither sustainable nor environment-friendly. Various laws enacted by governments around the world as well as heightened global awareness about sustainability and global warming is changing this situation. Significant research is being conducted in developing and utilizing sustainable fibers and resins, mostly derived from plant, to fabricate 'Green' composites. The significant progress in the past 20 or so years in this field has led to the development of green composites with high strength or so called "Advanced Green Composites". More interestingly, green composites have also acquired various different properties such as fire resistance, transparency, barrier to gases and others. The world is on the cusp of a major change, and once fully developed, such composites could be used in applications ranging from automobiles to sporting goods, from circuit boards to housing and from furniture to packaging. This book, by presenting the state-of-the-art developments in many aspects of advanced green composites, adds significantly to the knowledge base that is critical for their success of expanding their use in applications never seen before. The chapters are written by world's leading researchers and present in-depth information in a simple way. Audience The book should appeal to a broad range of research scientists (materials and polymer scientists), engineers, industrialists, architects and other practitioners as well as government personnel in research labs and students across various related fields. The industry interest is extremely wide and includes R&D and engineers in aerospace, agriculture, architectural, automotive, biomedical, chemical, composites, construction, electronics, fibers, medical, paper, packaging, plastics, textiles, and others) who are interested in designing green composites for various applications or want to design their products using green composites. This book will give them many ideas, ways and perhaps inspiration for building greener products.
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