Enhancing and Toughening Plant Oil-Based Polymeric Materials through Synergetic Supramolecular and Covalent Interactions by Introducing Nucleobase-Functionalized Celluloses

2021 ◽  
Author(s):  
Jianjun Li ◽  
Jiaqi Chen ◽  
Jiang Wu ◽  
Handan Lei ◽  
Yuting Tian ◽  
...  
Keyword(s):  
Intermolecular Interaction ◽  
Low Cost ◽  
Polymeric Materials ◽  
Plant Oil ◽  
Weak Intermolecular Interaction ◽  
Covalent Interactions

Renewable plant oil-based polymeric materials are promising to replace current petroleum-based polymers, considering its low cost and renewability. However, weak intermolecular interaction within the plant oil-based polymeric materials usually gives...

Surface Modification of Poly(Vinylchloride) for Manufacturing Advanced Catheters

2020 ◽  
Vol 27 (10) ◽  
pp. 1616-1633 ◽  
Author(s):  
Oana Cristina Duta ◽  
Aurel Mihail Ţîţu ◽  
Alexandru Marin ◽  
Anton Ficai ◽  
Denisa Ficai ◽  
...  
Keyword(s):  
Surface Modification ◽  
Chemical Modification ◽  
Medical Devices ◽  
Low Cost ◽  
Physical And Mechanical Properties ◽  
Polymeric Materials ◽  
Modern Medicine ◽  
Structural Failure ◽  
Chemical Grafting ◽  
One Step

Polymeric materials, due to their excellent physicochemical properties and versatility found applicability in multiples areas, including biomaterials used in tissue regeneration, prosthetics (hip, artificial valves), medical devices, controlled drug delivery systems, etc. Medical devices and their applications are very important in modern medicine and the need to develop new materials with improved properties or to improve the existent materials is increasing every day. Numerous reasearches are activated in this domain in order to obtain materials/surfaces that does not have drawbacks such as structural failure, calcifications, infections or thrombosis. One of the most used material is poly(vinylchloride) (PVC) due to its unique properties, availability and low cost. The most common method used for obtaining tubular devices that meet the requirements of medical use is the surface modification of polymers without changing their physical and mechanical properties, in bulk. PVC is a hydrophobic polymer and therefore many research studies were conducted in order to increase the hydrophilicity of the surface by chemical modification in order to improve biocompatibility, to enhance wettability, reduce friction or to make lubricious or antimicrobial coatings. Surface modification of PVC can be achieved by several strategies, in only one step or, in some cases, in two or more steps by applying several techniques consecutively to obtain the desired modification / performances. The most common processes used for modifying the surface of PVC devices are: plasma treatment, corona discharge, chemical grafting, electric discharge, vapour deposition of metals, flame treatment, direct chemical modification (oxidation, hydrolysis, etc.) or even some physical modification of the roughness of the surface.

Variation in conformation and weak intermolecular interaction networks of substituted 3-benzyl-2-phenyl-1,3,2-oxazaphospholidin-2-ones

2010 ◽  
Vol 973 (1-3) ◽  
pp. 144-151 ◽  
Author(s):  
Zhour Hattab ◽  
Carole Barbey ◽  
Maelle Monteil ◽  
Pascal Retailleau ◽  
Nour-Eddine Aouf ◽  
...  
Keyword(s):  
Intermolecular Interaction ◽  
Interaction Networks ◽  
Weak Intermolecular Interaction

Materials Selection for Sandwich Pipes Under the Combined Effect of Pressure, Bending and Temperature

2007 ◽  
Author(s):  
Allan R. de Souza ◽  
Theodoro A. Netto ◽  
Ilson P. Pasqualino
Keyword(s):  
Structural Strength ◽  
Material Selection ◽  
Low Cost ◽  
Polymeric Materials ◽  
External Pressure ◽  
Core Material ◽  
Annular Layer ◽  
Oil And Natural Gas ◽  
Longitudinal Bending ◽  
Logic Approach

Recent researches point to the great potential of the sandwich pipe conception for ultra deepwater exploitation and production of oil and natural gas. Its configuration is very simple and comprises two concentric metallic pipes with a core material, polymeric or ceramic, in the annulus. The main functions of the annular layer are: to provide satisfactory thermal insulation so as to avoid the formation of wax and hydrates along the pipeline during production shutdown; to improve the overall structural strength of the system. Polypropylene and cement have been recently proposed for these applications. The reason for the choice of these materials was the low cost and the extensive availability in industry. Here a systematic material selection approach is employed in order to assess the applicability of other polymeric materials. The attributes of materials needed to meet the design specification are thoroughly studied. The list of possible materials was enlarged and the modified digital logic approach is used with the purpose to define a top group of materials for further numerical comparative study. Finite element analyses are carried out to assess the structural strength of the sandwich pipe under pure external pressure or longitudinal bending and combined external pressure and bending. Additionally, the effect of thermal gradient is included to the numerical analyses to evaluate each pre-selected material of the top group. Results indicate that other potential materials such as PEEK and polycarbonate can improve the structural performance of the sandwich pipe conception and yet meet other several design criteria.

Carbon Dioxide as a Carbon Resource – Recent Trends and Perspectives

2012 ◽  
Vol 67 (10) ◽  
pp. 961-975 ◽  
Author(s):  
Markus Hölscher ◽  
Christoph Gürtler ◽  
Wilhelm Keim ◽  
Thomas E. Müller ◽  
Martina Peters ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Raw Materials ◽  
Low Cost ◽  
Polymeric Materials ◽  
Short Review ◽  
Chemical Research ◽  
Bond Forming ◽  
Bulk Chemicals ◽  
High Thermodynamic Stability ◽  
Recent Trends

With the growing perception of industrialized societies that fossil raw materials are limited resources, academic chemical research and chemical industry have started to introduce novel catalytic technologies which aim at the development of economically competitive processes relying much more strongly on the use of alternative carbon feedstocks. Great interest is given world-wide to carbon dioxide (CO2) as it is part of the global carbon cycle, nontoxic, easily available in sufficient quantities anywhere in the industrialized world, and can be managed technically with ease, and at low cost. In principle carbon dioxide can be used to generate a large variety of synthetic products ranging from bulk chemicals like methanol and formic acid, through polymeric materials, to fine chemicals like aromatic acids useful in the pharmaceutical industry. Owing to the high thermodynamic stability of CO2, the energy constraints of chemical reactions have to be carefully analyzed to select promising processes. Furthermore, the high kinetic barriers for incorporation of CO2 into C-H or C-C bond forming reactions require that any novel transformation of CO2 must inevitably be associated with a novel catalytic technology. This short review comprises a selection of the most recent academic and industrial research developments mainly with regard to innovations in CO2 chemistry in the field of homogeneous catalysis and processes.

scholarly journals Influence of kaolin filler on the mechanical properties of Luffa cylindrica/ polyester composite

2021 ◽  
Author(s):  
Aliyu Yaro ◽  
Laminu Kuburi ◽  
Musa Abiodun Moshood
Keyword(s):  
Mechanical Properties ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Low Cost ◽  
Microstructural Analysis ◽  
Polymeric Materials ◽  
Weight Fraction ◽  
Industrial Applications ◽  
Luffa Cylindrica ◽  
Polyester Composite

Abstract Polymeric materials are used in different industrial applications because they retain good environmental properties, low-cost, and easy to produce compared to conventional materials. This study investigated the effect of adding kaolin micro-filler (KF) on the mechanical properties of Luffa Fiber (LCF) reinforced polyester resin. Luffa cylindrica fiber treated with 5% NaOH, varied in weight fraction (5, 10, and 15%wt) was used to reinforce unsaturated polyester resin using hand lay-up method, whereas for the hybrid composite kaolin filler were kept constant at 6wt% fraction while the fibers varied as in the mono-reinforced composite. The samples were machined for mechanical and microstructural analysis. Analysis of the result revealed that the addition of kaolin has enhanced greatly the mechanical properties of Luffa-fibre based composites. The result reveal of the microstructure analysis, shows that there is an improvement in fiber-matrix adhesion.

Weak intermolecular interaction directed assembly of calix[4]arene derivatives

CrystEngComm ◽  
2019 ◽  
Vol 21 (46) ◽  
pp. 7114-7122 ◽  
Author(s):  
Zufeng Xiao ◽  
Weiping Yang ◽  
Jia Luo ◽  
Rong Guo ◽  
Rong Zeng ◽  
...  
Keyword(s):  
Intermolecular Interaction ◽  
Intermolecular Interactions ◽  
Directed Assembly ◽  
Weak Intermolecular Interaction ◽  
Weak Intermolecular Interactions

Dimer and tetramer structures of cone-di-formyl-calix[4]arene 16 were formed through weak intermolecular interactions.

Weak intermolecular interaction

1975 ◽  
Vol 36 (3) ◽  
pp. 207-214 ◽  
Author(s):  
Miroslav Urban ◽  
Pavel Hobza
Keyword(s):  
Intermolecular Interaction ◽  
Weak Intermolecular Interaction

Evaluation of low-cost disposable polymeric materials for sorptive extraction of organic pollutants in water samples

2012 ◽  
Vol 716 ◽  
pp. 119-127 ◽  
Author(s):  
Ailette Prieto ◽  
Rosario Rodil ◽  
José Benito Quintana ◽  
Isaac Rodríguez ◽  
Rafael Cela ◽  
...  
Keyword(s):  
Organic Pollutants ◽  
Water Samples ◽  
Low Cost ◽  
Polymeric Materials ◽  
Sorptive Extraction

A Solvent-Free Synthetic Technique for Epoxidized Methyl-α-Eleostearate Catalyzed by Cation Exchange Resin

2013 ◽  
Vol 830 ◽  
pp. 180-184
Author(s):  
Jin Hua Zhou ◽  
Ni Li ◽  
Jing Yang ◽  
Wen Jie Ma ◽  
Han Zhou Sun
Keyword(s):  
Cation Exchange ◽  
Exchange Resin ◽  
Low Cost ◽  
Cation Exchange Resin ◽  
Solvent Free ◽  
Molar Ratio ◽  
Production Cycle ◽  
Aliphatic Acid ◽  
Plant Oil ◽  
Tung Oil

Epoxidized methyl-α-eleostearate (EME) is a new kind of plant oil-based epoxidized aliphatic acid ester which starts from Tung oil. Tung oil is a special, but abundant biomass resource in China. A solvent-free synthetic technique for EME catalyzed by cation exchange resin was developed. Experimental results showed that the optimal synthetic conditions for EME were as follows: cation exchange resin dosage 5% (wt, calculated by methyl-α-eleostearate), material molar ratio of methyl-α-eleostearate, H2O2 and CH3COOH 1:5:2.5, reaction duration 3 h and reaction temperature 65 °C. EME epoxy value reaches 6.5% under the optimal preparation conditions. The newly developed green technique features low cost, simple operation, low energy consumption, less pollution, short production cycle and good quality and is promising to be industrialized.

Sign in / Sign up

Export Citation Format

Share Document