Water Storage and Controlled-Release Film(WSCF) Materials Used in Tree Planting in Desert Regions

2011 ◽  
Vol 356-360 ◽  
pp. 467-470
Author(s):  
Gui Quan Han ◽  
Zhao Xiang Han ◽  
Dong En Zhang ◽  
Zeng Zhi Zhang
Keyword(s):  
Controlled Release ◽  
Polymer Composite ◽  
Environmental Conditions ◽  
Water Storage ◽  
Tree Planting ◽  
Desert Regions ◽  
Materials Used

Water Storage and Controlled-release Film (WSCF) is a new kind of polymer composite with the function of releasing water slowly in a given period. This paper resumptively introduces the importance of water storage and controlled-release film (WSCF) material for tree planning in desertified regions. Microstructures of WSCF were studied and experiments were also carried out successively in various environmental conditions.

Effect of Micro-Organism on the Process of Water Storage and Controlled-Release Film’Degradation

2011 ◽  
Vol 356-360 ◽  
pp. 484-487
Author(s):  
Gui Quan Han ◽  
Zhao Xiang Han ◽  
Dong En Zhang ◽  
Chong Cui ◽  
Zeng Zhi Zhang
Keyword(s):  
Controlled Release ◽  
Polymer Composite ◽  
Liquid Culture ◽  
Degradation Rate ◽  
Water Storage ◽  
Plastic Film ◽  
Field Soil ◽  
Soil Culture ◽  
Soil Suspension ◽  
Degradation Rates

Water Storage and Controlled-release Film (WSCF) is a new kind of polymer composite with the function of releasing water slowly in a given period. Micro-organism culture was carried out to study the process of film’s degradation. The results showed that the degradation rate of WSCF added with fungi suspension was increased by 0.6% more than that of WSCF without fungi suspension. The degradation rate of WSCF added with soil suspension was increased by about 1% more than the film without soil suspension. Compared different culture mediums, the order of degradation rates of WSCF was: bacteria medium > actinomyces medium > fungi medium. The degradation rate of WSCF with field soil suspension was the highest one. The degradation rate of WSCF was higher than ordinary plastic film, increased by 3-5%. The results of tests under liquid culture indicated that mixed bacterium were helpful to the degradation of WSCF, the degradation rate of WSCF under liquid culture was higher than that of soil culture, increased by about 2%.

Thermoplastic Characteristics of Polymer Composite Materials Used for the Manufacture of Ship Systems Pipelines

2020 ◽  
Vol 869 ◽  
pp. 7-14
Author(s):  
Gia Viet Ngo
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Raw Materials ◽  
Fire Hazard ◽  
Sheet Material ◽  
Polymer Composite Materials ◽  
Domestic Industry ◽  
Thermoplastic Matrix ◽  
Materials Used ◽  
Physical And Mechanical Characteristics

The article presents thermoplastic characteristics of polymer composite materials developed on domestic raw materials on a thermoplastic matrix-injection material of the VTP-7 brand based on polyaryl sulfones (polysulfone PSU) plastic and sheet material of the VKU-44 brand based on PSU and carbon unidirectional tape ELUR 0.08 PA. In the article, the author considered the modification method of thermoplastic polymers to impart functional properties and mechanisms of their action. It is shown that the developed materials have no analogues in the domestic industry. According to the level of physical and mechanical characteristics, fire-hazard properties and heat resistance, the developed polymer composite materials (PCM) fully meets the requirements for modern thermoplastic PCM, and is not inferior to foreign analogues.

scholarly journals DEVELOPMENT OF POLYMERIC COMPOSITE MATERIALS BASED ON THERMOPLASTIC ELASTOMERS

2016 ◽  
Vol 1 (12) ◽  
pp. 195-199
Author(s):  
Прут ◽  
Eduard Prut ◽  
Черкашина ◽  
Natalya Cherkashina ◽  
Ястребинская ◽  
...  
Keyword(s):  
Composite Materials ◽  
Polymer Composite ◽  
Filler Content ◽  
Sol Gel ◽  
Polymeric Composite ◽  
Thermoplastic Elastomers ◽  
Polymer Composite Materials ◽  
Dynamic Vulcanization ◽  
The Matrix ◽  
Materials Used

This paper presents data on the development of polymer composite materials based on thermoplastic elastomers. As starting materials for the synthesis of the matrix components were selected as follows: isotactic polypropylene and ternary ethylene-propylene-diene elastomer (EPDM). Diene component in EPDM are ethylidene norbornene composition in an amount of 4-5%. Dynamic vulcanization was carried out using the elastomer element sulfur. The filler polymer composite materials used silica gel with dimethyl polysiloxane. Synthesis was carried out by filling the sol-gel technology. The filler content in the composite varied from 10 to 80% by weight. Mixing of filler and the matrix was performed in a laboratory twin-rotor mixer, type "Brabender". It is found that the maximum possible filler content of the matrix used was 80%. With the introduction of more filler mixing of the components it has been difficult. When the filler content from 10 to 70% of parameters such as tensile strength, flexural strength and modulus of longitudinal elasticity increasing and administered at higher filler and 80 wt%. markedly reduced. Thus, it can be concluded that the content of filler in the composite is 70%. Further research should be directed to the evaluation of the radiation resistance of the developed composite materials.

scholarly journals THE ROLE OF MATRIX TABLET IN DRUG DELIVERY SYSTEM

2018 ◽  
Vol 10 (1) ◽  
pp. 1 ◽  
Author(s):  
Nita Mondal
Keyword(s):  
Controlled Release ◽  
Safety Margin ◽  
Oral Route ◽  
Dosage Forms ◽  
Matrix Tablets ◽  
Release Mechanism ◽  
Matrix Tablet ◽  
The Matrix ◽  
Potent Drug ◽  
Materials Used

Matrix tablet is an important tool for controlled and sustained release dosage forms. The oral route remains the most common route for the administration of drugs. Tablets offer the lowest cost approach to sustained and controlled release dosage forms. The hydrophilic polymer matrix is widely used in this dosage form. The use of different polymers in controlling the release of drugs has become the most important tool in the formulation of matrix tablets. The drug releases by both dissolution-controlled as well as diffusion-controlled mechanisms from the matrix. The development of oral controlled release systems has been a challenge to formulation scientists due to their inability to restrain and localize the system at targeted areas of the gastrointestinal tract. There are several advantages of matrix devices including improved patient compliance due to less frequent drug administration, reduction of fluctuation in steady-state drug levels, maximum utilization of the drug, increased safety margin of a potent drug. This review aims on the discussion of different materials used to prepare matrix tablets, different types of matrix tablets and the drug release mechanism from the matrices.

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