scholarly journals Modification of PLA-Based Films by Grafting or Coating

2020 ◽  
Vol 11 (2) ◽  
pp. 30 ◽  
Author(s):  
Aleksandra Miletić ◽  
Ivan Ristić ◽  
Maria-Beatrice Coltelli ◽  
Branka Pilić
Keyword(s):  
Surface Modification ◽  
Active Component ◽  
Mechanical Characterization ◽  
Natural Polymer ◽  
Natural Polymers ◽  
Hydrophilic Surfaces ◽  
Nanostructured Systems ◽  
Grafting From ◽  
Specific Challenge

Recently, the demand for the use of natural polymers in the cosmetic, biomedical, and sanitary sectors has been increasing. In order to meet specific functional properties of the products, usually, the incorporation of the active component is required. One of the main problems is enabling compatibility between hydrophobic and hydrophilic surfaces. Therefore, surface modification is necessary. Poly(lactide) (PLA) is a natural polymer that has attracted a lot ofattention in recent years. It is bio-based, can be produced from carbohydrate sources like corn, and it is biodegradable. The main goal of this work was the functionalization of PLA, inserting antiseptic and anti-inflammatory nanostructured systems based on chitin nanofibrils–nanolignin complexes ready to be used in the biomedical, cosmetics, and sanitary sectors. The specific challenge of this investigation was to increase the interaction between the hydrophobic PLA matrix with hydrophilic chitin–lignin nanoparticle complexes. First, chemical modification via the “grafting from” method using lactide oligomers was performed. Then, active coatings with modified and unmodified chitin–lignin nanoparticle complexes were prepared and applied on extruded PLA-based sheets. The chemical, thermal, and mechanical characterization of prepared samples was carried out and the obtained results were discussed.

scholarly journals NATURAL POLYMER GRAFTED WITH SYNTETHIC MONOMER BY MICROWAVE FOR WATER TREATMENT - A REVIEW

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
Efrén de Jesús Muñoz Prieto ◽  
Bernabé Rivas ◽  
Julio Sánchez
Keyword(s):  
Water Treatment ◽  
Microwave Heating ◽  
Spectroscopic Analysis ◽  
Graft Copolymers ◽  
Analytical Techniques ◽  
Natural Polymer ◽  
Natural Polymers ◽  
Synthesis Mechanism ◽  
Microwave Assisted

<strong>Abstract</strong><span>In this study, the use of natural polymers grafted with synthetic monomers to obtain copolymers for specific applications is revised. This review highlights current uses of microwave heating, in the grafting modifications of naturalpolymers, with other synthetic monomers and explores methodology of this technique. Microwave assisted and microwave initiated synthesized graft copolymers show superior flocculation characteristics when compared with graft copolymers produced by conventional methods. Synthesis,mechanism and characterization of these materials by different analytical techniques such as spectroscopic analysis and others are reviewed. We explore information concerning the development and characterization of grafting polymers, which have been receiving enlarged attention in recentyears as flocculants for water treatment. The effectiveness of flocculation for applications in reduction of pollutants in wastewater is also evaluated. </span><br /><strong>Keywords: </strong><span>Copolymer, Flocculant, Grafting, Microwave, Wastewater</span>

Spectro-mechanical Characterization of Aromaticity and Maturity of Kerogens in Oil Shale at 6 nm Spatial Resolution

2018 ◽  
Author(s):  
Devon Jakob ◽  
Le Wang ◽  
Haomin Wang ◽  
Xiaoji Xu
Keyword(s):  
Spatial Resolution ◽  
Oil Shale ◽  
Infrared Imaging ◽  
Mechanical Characterization ◽  
Optical Diffraction ◽  
Chemical Compositions ◽  
Valuable Insight ◽  
Eagle Ford Shale

<p>In situ measurements of the chemical compositions and mechanical properties of kerogen help understand the formation, transformation, and utilization of organic matter in the oil shale at the nanoscale. However, the optical diffraction limit prevents attainment of nanoscale resolution using conventional spectroscopy and microscopy. Here, we utilize peak force infrared (PFIR) microscopy for multimodal characterization of kerogen in oil shale. The PFIR provides correlative infrared imaging, mechanical mapping, and broadband infrared spectroscopy capability with 6 nm spatial resolution. We observed nanoscale heterogeneity in the chemical composition, aromaticity, and maturity of the kerogens from oil shales from Eagle Ford shale play in Texas. The kerogen aromaticity positively correlates with the local mechanical moduli of the surrounding inorganic matrix, manifesting the Le Chatelier’s principle. In situ spectro-mechanical characterization of oil shale will yield valuable insight for geochemical and geomechanical modeling on the origin and transformation of kerogen in the oil shale.</p>

In-vivo evaluation of cisplatin nanoparticles encompass natural polymer

2020 ◽  
Vol 6 (1) ◽  
pp. 1-7
Author(s):  
Bhavani J ◽  
Sunil Kumar Prajapati ◽  
Ravichandran S
Keyword(s):  
Tumor Volume ◽  
Nitrogen Mustard ◽  
Common Type ◽  
The Body ◽  
Nano Particles ◽  
Natural Polymer ◽  
Drinking Alcohol ◽  
In Vivo Evaluation

Cancer is assemblage diseases involving abnormal cell growth amid the potential of spread to other parts of the body due to tobacco use are the cause of about of cancer deaths. Another 10% is due to obesity, poor diet & drinking alcohol. In 2012 about 14.1 million new cases of cancer occurred globally. In females, the most common type is breast cancer. Cisplatin also known as cytophosphane is a nitrogen mustard alkylating agent from the oxazophosphinans groups were used to treat cancers & autoimmune disorders. Based on the above reasons I will fix the aim Preparation characterization of Cisplatin- nano particles  &  its anticancer activity. Solid tumor volume examination report showed that the assessment of different day indication 15,20,25 & 30th variations of different groups of tumor volumes were decreased CPG Nanoparticles (100 mg/kg)+ DAL(15th day 4.97±0.24↓), (20th day 0.6±0.13↓), (25th day 1.35±0.30↓) & (30th day 1.89±0.13↓).

MECHANICAL CHARACTERIZATION OF POLYMER MATERIALS UNDER LOW STRAIN RATE LOADING

2017 ◽  
Vol 5 (3) ◽  
pp. 8
Author(s):  
KUMAR DINESH ◽  
KAUR ARSHDEEP ◽  
AGGARWAL YUGAM KUMAR ◽  
UNIYAL PIYUSH ◽  
KUMAR NAVIN ◽  
...  
Keyword(s):  
Strain Rate ◽  
Mechanical Characterization ◽  
Polymer Materials ◽  
Strain Rate Loading ◽  
Low Strain Rate

MECHANICAL CHARACTERIZATION OF VEGETAL COMPOSITES USING DIC

2019 ◽  
Author(s):  
Alexandre Luiz Pereira ◽  
Rafael Oliveira Santos ◽  
DOINA BANEA ◽  
Álisson Lemos
Keyword(s):  
Mechanical Characterization
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