21/12/2017 · Syntheses and application of polylactides
21/01/2008 · –21–Polylactic Acid: Synthesis, Properties and Applications L
Polylactic Acid: Synthesis, Properties and Applications L
Over the last few years, waterborne polyurethane (WPU) was applied to various fibers, adhesives, primers for metals, caulking materials, emulsion polymerization media, paint additives, defoamers, associate thickeners, pigment pastes, textile dyes and biomaterials, resulting in the increasing enthusiasm of researchers to design and synthesize novel WPU with unique properties. Thus, various processes and raw materials have been developed to prepare WPU. This review gives an overview on the developments of WPU mainly derived from novel polyols, analyzes the potential application in water-based inks and presents the probable future research area about water-based inks. Notably, the poly(ε-caprolactone) and poly(lactic acid) are the versatile materials used in WPU synthesis and supply the potential special performance for preparing WPU. Meanwhile, addition-fragmentation chain transfer (RAFT) polymerization and atom transfer radical polymerization (ATRP) processes provide an opportunity to control the chain sequence of WPU and obtain products with the desired performance.
Photo provided by Flickr
It is necessary to reduce the toxic and hazardous isocyanate based polyurethane chemistry due to the tendency of eco-friendly and green materials for applications in polymers and coatings. Novel non-isocyanate polyurethanes are prepared by an isocyanate free method[, ]. First of all, new cyclic carbonate (CC) from cashew nut shell liquid derivative was synthesized as the precursor for non-isocyanate polyurethanes synthesis. Secondly, non-isocyanate polyurethanes were obtained by the reaction of CC with hexamethylenediamine (HMDA) and isophorone diamine (IPDA). Further, the non-isocyanate polyurethanes coatings were evaluated for the physical, mechanical, chemical and thermal properties by curing on metal substrate. Meanwhile, the curing kinetics of reaction between cyclic carbonate and diamine were analyzed. It revealed that the non-isocyanate polyurethanes formation largely depends on the type of amine used, reaction temperature and reaction time.
Efficient ZnO aqueous nanoparticle catalysed lactide synthesis ..
Photo provided by Flickr
Research in the Sibi group is focused on the development of novel methods for the conversion of renewable resources to feedstock chemicals for use in polymer synthesis and programmed degradation of polymers. In our work we have use three important renewable materials (1) oil seeds, (2) cellulose, and (3) lignin. In particular, we are investigating novel methodologies for the synthesis of linear dicarboxylic acids and application of 5-hydroxymethyl furfural (HMF) as a starting material. The Sibi group collaborates extensively with the polymer synthesis and polymer degradation team at NDSU.
Dr. Du’s research for the Center for Sustainable Materials Science (CSMS) centers on catalysis and green chemistry. Currently, one of the main focuses is the development of efficient and selective catalytic systems for the synthesis of biodegradable polymers such as polycarbonates, polylactides, and polyesters, from renewable resources such as carbon dioxide and biomass.
Polylactic acid can be processed ..
Photo provided by Flickr
The main goal of this project is to determine the feasibility of using oil from different oil-seed crops for synthesis of high value and high profit bio-based specialty monomers for free radical polymerization. If successful, new library of plant oil-based monomers will be applied directly in copolymerization with conventional vinyl counterparts to develop high-performance biobased polymer materials (including latexes, emulsions) for coatings/paints/adhesives applications.
Sobota, Synthesis and structural characterization of magnesium drug complexes: efficient initiators for forming polylactide-drug conjugates, Organometallics 34(2015) 4871-4880;
Photo provided by Flickr
Wikimedia Commons has media related to Polylactides.
26/12/2017 · Request (PDF) | Polylactides - Synth..
polylactic acid: synthesis, properties and applications polylactic acid: synthesis, properties and ..
Poly-lactic acid synthesis for application in biomedical ..
Recent Advances in Synthesis of Waterborne Polyurethane and Their Application in Water-based Ink: A Review
and the polymer synthesis such ..
273 (1995)  p.r
Properties, Synthesis, Process, Application, ..
Genetic vaccination is predicated on the underlying principle that diseases can be prevented by the controlled introduction of genetic material encoding antigenic proteins from pathogenic organisms to elicit the formation of protective immune responses. Driving this process is the choice of carrier that is responsible for navigating the obstacles associated with gene delivery. In this work, we expand upon a novel class of hybrid biosynthetic gene delivery vectors that are composed of a biomaterial outer coating and a bacterial () inner core. Specifically, a series of newly developed biodegradable cationic polylactides (CPLAs) and their PEGylated variants were selected to investigate the role of low polydispersity index (PDI), charge density, and PEGylation upon hybrid vector assembly and gene delivery efficacy. Upon assembly, hybrid vectors mediated increased gene delivery beyond that of the individual bacterial vector in isolation, including assays with increasing medium protein content to highlight shielding properties afforded by the PEG-functionalized CPLA component. Furthermore, after extensive characterization of surface deposition of the polymer, results prompted a new model for describing hybrid vector assembly that includes cellular coating and penetration of the CPLA component. In summary, these results provide new options and insight toward the assembly and application of next-generation hybrid biosynthetic gene delivery vectors.
General Polymer Science & Technology
The main goal of this review is to give an overview of academic study in the field of WPU based on novel oligomer polyols and the potential application in the water-based ink. Especially, polyols obtained from the vegetable oils, which is the renewable resources, have a great research value and enormous potential application in the synthesis of WPU and water-based ink. To our best knowledge, no literature has provided a thorough review on the novel polyols and water-based ink recently. Thus, this review also aims to guide the beginner devoting to the WPU and water-based ink to find the research direction. The main content of this review is depicted in
Optimization of controlled ring-opening polymerization …
Meanwhile, Gaudin and Zydowicz developed the miniemulsion process by interfacial step polymerization to prepare poly(urethane-urea) nanocapsules of 70 nm in mean diameter. According to the interfacial step polymerization in miniemulsion process, it was possible to reduce the size of polyurethane nanocapsules. The morphology and thermal properties of the nanocapsules were studied. Compared with the nanocapsules of 200 nm in mean diameter, it was found that the size of nanodroplets in the range of 70-200 nm made no sense to the chemical structure of the membrane and the final properties of the nanocapsules. Apart from the stable nanoparticles obtained via MEPP, other unique properties could be also obtained. Lopez et al. studied the application of waterborne polyurethane and the blend with acrylic obtained through miniemulsion polymerization. It is indicated that the WPU-acrylic hybrid nanoparticles synthesized in this research can be used as pressure-sensitive adhesives (PSAs). Even more noteworthy is that, to measure the adhesion of the blend, a custom-designed probe-tack setup was employed, as shown in The results suggested that the cohesive strength increased largely because of the addition of polyurethane to a standard waterborne acrylic, leading to a decrease in the relative viscous component and in the tack energy.
"I have always been impressed by the quick turnaround and your thoroughness. Easily the most professional essay writing service on the web."
"Your assistance and the first class service is much appreciated. My essay reads so well and without your help I'm sure I would have been marked down again on grammar and syntax."
"Thanks again for your excellent work with my assignments. No doubts you're true experts at what you do and very approachable."
"Very professional, cheap and friendly service. Thanks for writing two important essays for me, I wouldn't have written it myself because of the tight deadline."
"Thanks for your cautious eye, attention to detail and overall superb service. Thanks to you, now I am confident that I can submit my term paper on time."
"Thank you for the GREAT work you have done. Just wanted to tell that I'm very happy with my essay and will get back with more assignments soon."