Melt Electrospinning

Melt Electrospinning: A Green Method to Produce Superfine Fibers introduces the latest results from a leading research group in this area, exploring the structure, equipment polymer properties and spinning conditions of melt electrospinning. Sections introduce the invention of melt electrospinning, including the independent development of centrifugal melt electrospinning and upward melt electrospinning, discuss electro magnetization of melt and the testing method of fiber performance by means of different polymers and self-designed devices, cover simulation, and introduce principle methods and improvement measures of centrifugal melt electrospinning. Presents melt electrospinning, a green nanofiber fabrication technology Introduces the invention of melt electrospinning, including centrifugal melt electrospinning and upward melt electrospinning Describes optimization techniques, electro magnetization of melt, testing methods, DPD simulation and improvement methods Provides a useful introduction to contemporary electrospinning research with a view to its many potential applications

This book provides a comparison between melt electrospinning and meltblowing as techniques for the production of polypropylene nanofibers. The author compares the morphological, structural, chemical and mechanical characteristics of the different produced fibers. Moreover, the degree of thermal degradation of the different fibers is also analyzed. The book is useful to chemists and material scientists working on the synthesis of nanofibers by melt processes, showing the limitations of each technique for nanofiber fabrication.

Abstract: Three-dimensional (3D) melt electrospinning writing (MEW) is a promising technique for 3D printing of porous scaffolds with well-defined geometrical features. The diameter of electrospun fibers strongly affect the achievable resolution and consequently several other physical, mechanical, and structural properties of the fabricated scaffold. However, there are a few process parameters which significantly affect the size of electrospun fibers. In this study, response surface methodology (RSM) was used to investigate the critical and optimized process parameters and their interaction effects on the desired fiber diameter. Four process parameters, including collector speed, tip-to-collector distance, applied pressure, and voltage were studied considering their practical ranges. The results showed that all the parameters except the applied voltage had a significant effect on the printed fiber diameters. A generalized model for the interaction effects of the parameters was introduced which can be used as a framework for selecting the process parameters to achieve the desired fiber diameter. The developed model was validated by choosing random process parameters and printing three-dimensional scaffolds. The results confirm that the predicted fiber diameters match closely with the actual fiber diameters measured directly from the printed scaffold. Graphical abstract: Highlights: Response Surface Methodology was applied to model 3D Melt Electrospinning Writing. Effective process parameters including feed rate, tip-to-collector distance, applied pressure, and voltage were considered. Model equation was developed to explain the relationship between fiber diameter and process parameters. The obtained model was statistically examined and experimentally validated.

This thesis presents a melt electrospinning technique to fabricate highly porous and controllable poly (?-caprolactone) (PCL) microfibers for tissue engineering applications and rehabilitation applications. Electrospinning without solvents via melt methods may be an attractive approach to tissue engineering of cell constructs where solvent accumulation or toxicity is an issue. This method is also able to produce microfibers with controllable parameters. However, the fiber diameters resulting from melt electrospinning processes are relatively large when compared to the fibers from solution electrospinning. The typical microfiber diameter from melt electrospinning was reported to be approximately 0.1mm. In order to further develop the melt electrospinning technique, we focused on the design of a melt electrospinning setup based on numerical analysis using the Solidworks 2013 simulation package and practically established a melt electrospinning setup and thermal control system for accurate experiments. One of main purposes of this thesis is the build-up of mathematical modeling to control and predict the electrospun microfiber via a more intricate understanding of their parameters such as the nozzle diameter, applied voltage, distance between the nozzle and counter electrode, temperature, flow rate, linear transitional speed, among others. The model is composed of three parts: 1) melt electrospinning process modeling, 2) fibrous helix movement modeling, and 3) build-up of microfibers modeling. The melt electrospinning process model describes an electric field, the shape of jet's continuously changing shape, and how the polymer melt is stretched into a Taylor cone and a straight jet.

This book comprehensively addresses advanced nanofiber manufacturing based on electrospinning technology. The principles, relationships between process parameters and structure, morphology and performance of electrospun nanofibers and nanomaterials, and the methods for enhanced field intensity and uniform distribution are discussed. The electric field intensity and distribution during electrospinning is also analyzed based on finite element analysis on both the needle and the needleless electrospinning. Furthermore, the modification techniques for improved nanomaterials strength are covered, aiming to provide effective avenues towards the manufacture of stronger nanofiber or nanomaterial products.

Electrospinning techniques are used to produce novel nanoscale fibrous materials used in a diverse range of applications. Electrospinning: Principles Practice and Possibilities provides a snapshot of the current cutting edge developments of the field. The first chapter introduces readers to electrospinning, followed by different techniques to prepare fibres such as melt electrospinning and colloidal electrospinning, as well as the properties, structures and uses of the nanofibrous materials in energy applications and regenerative medicine and future directions. This balanced and authoritative book will appeal to a broad audience of postgraduate students, industrial and academic researchers in the physical and life sciences as well as engineering.

The last two decades have seen electrospinning of nanofibers performed mainly from solutions of toxic organic solvents. The increase in demand for scaling up electrospinning in recent years therefore requires an environmentally friendly process free of organic solvents. This book addresses techniques for clean and safe electrospinning in the fabrication of green nanofibers and their potential applications.

The third system is an extension from melt electrospinning, which is heated solution electrospinning of polyolefin. We explored the possibilities of electrospinning sub-micron polyolefin fibers directly from their solutions and investigated the effects of processing parameters on fiber morphologies and properties.

Volume is indexed by Thomson Reuters CPCI-S (WoS). The book aims to exchange and share a number of experts and scholars’s experiences and research results about all aspects of polymer processing and modification technology; modern mold technology; rapid prototyping technology, automobiles, home appliances, electronic and aviation materials processing; materials processing simulation technology; molding equipment and process data acquisition and monitoring and other areas of new concepts. The book further enhance the interrelationships between realms of processing equipment, molding technology, mold design, mold manufacture and materials modification, to raise the application level for polymer and composite material in technologies such as cash manufacturing.

The Asian Workshop on Polymer Processing 2011(AWPP2011), organized by JSPP, SAMP and the China Science Foundation, was hosted by Qingdao University of Science and Technology in Qingdao, China from November 4 to 7th, 2011. Volume is indexed by Thomson Reuters CPCI-S (WoS). Numerous leading experts on polymer materials and processing presented their recent research finding at the meeting, and the result is an invaluable state-of-the-art guide to the subject.

In present book collected papers by results of researches which were presented on the conference “The 6th RMUTP International Conference on Science, Technology and Innovation for Sustainable Development: Current Challenges towards Creative and Green Economy”. The conference topic was with emphasizing on use of ideas of the sustainable development and green growth in research and engineering solutions for creating of innovative technologies in area of sustainability engineering, textiles and clothing industry, education and industrial engineering.

Collection of selected, peer reviewed papers from the 16th Annual Conference and 5th International Conference of the Chinese Society of Micro-Nano Technology (CSMNT 2014), August 31-September 3, 2014, Chengdu, China. The 226 papers are grouped as follows: Chapter 1: Materials and Technologies in the Scale of Micro and Nano; Chapter 2: Micro/Nanofluids Research and Technologies; Chapter 3: Measurements, Sensors and MEMS; Chapter 4: Micro Actuators and Devices; Chapter 5: Optics in the Scale of Micro and Nano; Chapter 6: Energy Harvesting, Power Supply and Technologies for Fuel Cells; Chapter 7: Bioresearch and Biomedical Engineering

Polymers are one of the key engineering materials and are widely used in many fields of economic development, and scientific and technological innovation. During their rapid development throughout the 20th century, polymers deeply influenced the entire world economy. The more than 129 peer-reviewed papers presented here cover the latest trends and achievements in this field of research and will help enterprises to improve product quality and the range of applications so as to enhance company-brand competition strength in the international market-place. This will be essential reading for design and production engineers, in particular. Volume is indexed by Thomson Reuters CPCI-S (WoS).

Selected, peer reviewed papers from the International Conference on Nanotechnology and Precision Engineering (ICNPE 2012), December 18-19, 2012, Guangzhou, China