Effect of viscosity modifiers on soil wicking and physico-mechanical properties of a polyurethane based sprayable biodegradable polymer membrane

2019 ◽  
Vol 222 ◽  
pp. 346-353 ◽  
Author(s):  
Raju Adhikari ◽  
Hendre Mingtarja ◽  
George Freischmidt ◽  
Keith L. Bristow ◽  
Philip S. Casey ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Biodegradable Polymer ◽  
Polymer Membrane ◽  
Viscosity Modifiers

Possibilities of using biodegradable polymeric materials in the agricultural sector

2020 ◽  
Vol 67 (2) ◽  
pp. 115-120
Author(s):  
Raisa A. Alekhina ◽  
Victoriya E. Slavkina ◽  
Yuliya A. Lopatina
Keyword(s):  
Mechanical Properties ◽  
Biodegradable Polymers ◽  
Biodegradable Polymer ◽  
Agricultural Sector ◽  
Polymeric Materials ◽  
Polymer Materials ◽  
Limiting Factors ◽  
Research Purpose ◽  
Biodegradable Materials ◽  
Advantages And Disadvantages

The article presents options for recycling polymers. The use of biodegradable materials is promising. This is a special class of polymers that can decompose under aerobic or anaerobic conditions under the action of microorganisms or enzymes forming natural products such as carbon dioxide, nitrogen, water, biomass, and inorganic salts. (Research purpose) The research purpose is in reviewing biodegradable materials that can be used for the manufacture of products used in agriculture. (Materials and methods) The study are based on open information sources containing information about biodegradable materials. Research methods are collecting, studying and comparative analysis of information. (Results and discussion) The article presents the advantages and disadvantages of biodegradable materials, mechanical properties of the main groups of biodegradable polymers. The article provides a summary list of agricultural products that can be made from biodegradable polymer materials. It was found that products from the general group are widely used in agriculture. Authors have found that products from a special group can only be made from biodegradable polymers with a controlled decomposition period in the soil, their use contributes to increasing the productivity of crops. (Conclusions) It was found that biodegradable polymer materials, along with environmental safety, have mechanical properties that allow them producing products that do not carry significant loads during operation. We have shown that the creation of responsible products (machine parts) from biodegradable polymers requires an increase in their strength properties, which is achievable by creating composites based on them. It was found that the technological complexity of their manufacture and high cost are the limiting factors for the widespread use of biodegradable polymers at this stage.

scholarly journals Effect of Cold Drawing on Mechanical Properties of Biodegradable Fibers

2017 ◽  
Vol 15 (1) ◽  
pp. 70-76 ◽  
Author(s):  
Francesco Paolo La Mantia ◽  
Manuela Ceraulo ◽  
Maria Chiara Mistretta ◽  
Marco Morreale
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Biodegradable Polymers ◽  
Biodegradable Polymer ◽  
Cold Drawing ◽  
Thermal Characterization ◽  
Systematic Investigation ◽  
Thermomechanical Properties ◽  
Polymer Systems ◽  
The Impact

Purpose Biodegradable polymers are currently gaining importance in several fields, because they allow mitigation of the impact on the environment related to disposal of traditional, nonbiodegradable polymers, as well as reducing the utilization of oil-based sources (when they also come from renewable resources). Fibers made of biodegradable polymers are of particular interest, though, it is not easy to obtain polymer fibers with suitable mechanical properties and to tailor these to the specific application. The main ways to tailor the mechanical properties of a given biodegradable polymer fiber are based on crystallinity and orientation control. However, crystallinity can only marginally be modified during processing, while orientation can be controlled, either during hot drawing or cold stretching. In this paper, a systematic investigation of the influence of cold stretching on the mechanical and thermomechanical properties of fibers prepared from different biodegradable polymer systems was carried out. Methods Rheological and thermal characterization helped in interpreting the orientation mechanisms, also on the basis of the molecular structure of the polymer systems. Results and conclusions It was found that cold drawing strongly improved the elastic modulus, tensile strength and thermomechanical resistance of the fibers, in comparison with hot-spun fibers. The elastic modulus showed higher increment rates in the biodegradable systems upon increasing the draw ratio.

Research on mechanical properties of a polymer membrane with a void based on the finite deformation theory

e-Polymers ◽  
2015 ◽  
Vol 15 (5) ◽  
pp. 293-299
Author(s):  
Jianbing Sang ◽  
Sufang Xing ◽  
Hongyan Tian ◽  
Jingyuan Wang ◽  
Jing Zhou
Keyword(s):  
Mechanical Properties ◽  
Finite Deformation ◽  
Deformation Theory ◽  
Polymer Membrane ◽  
Constitutive Parameter ◽  
Deformation Analysis ◽  
Membrane Structures ◽  
Finite Deformation Theory ◽  
Constitutive Parameters ◽  
Failure Localization

AbstractPolymer membrane structures with voids can be fractured due to larger deformation and stress concentration with the effect of an externally applied load, which can lead to failure localization and crack propagation. With the modified constitutive model from Gao, finite deformation analysis of a polymer membrane containing a void has been researched. By deducing the basic governing equation for solving the problem, the paper figures out the stress distribution of different constitutive parameters and discusses the effects on membrane deformation by different parameters and the reasons for the failure of the membrane. The results show that the constitutive parameter n has a major impact on the mechanical properties of a polymer membrane with a void, which provides a reference for the design of polymer membranes.

Mechanical Properties of a Biodegradable Bone Regeneration Scaffold

2000 ◽  
Vol 122 (3) ◽  
pp. 286-288 ◽  
Author(s):  
B. D. Porter, ◽  
J. B. Oldham, ◽  
S.-L. He, and ◽  
M. E. Zobitz ◽  
R. G. Payne ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bone Regeneration ◽  
Trabecular Bone ◽  
Biodegradable Polymer ◽  
Modulus Of Elasticity ◽  
Mechanical Stability ◽  
Circular Cylinders ◽  
Order Of Magnitude ◽  
The Mean

Poly (Propylene Fumarate) (PPF), a novel, bulk erosion, biodegradable polymer, has been shown to have osteoconductive effects in vivo when used as a bone regeneration scaffold (Peter, S. J., Suggs, L. J., Yaszemski, M. J., Engel, P. S., and Mikos, A. J., 1999, J. Biomater. Sci. Polym. Ed., 10, pp. 363–373). The material properties of the polymer allow it to be injected into irregularly shaped voids in vivo and provide mechanical stability as well as function as a bone regeneration scaffold. We fabricated a series of biomaterial composites, comprised of varying quantities of PPF, NaCl and β-tricalcium phosphate (β-TCP), into the shape of right circular cylinders and tested the mechanical properties in four-point bending and compression. The mean modulus of elasticity in compression Ec was 1204.2 MPa (SD 32.2) and the mean modulus of elasticity in bending Eb was 1274.7 MPa (SD 125.7). All of the moduli were on the order of magnitude of trabecular bone. Changing the level of NaCl from 20 to 40 percent, by mass, did not decrease Ec and Eb significantly, but did decrease bending and compressive strength significantly. Increasing the β-TCP from 0.25 g/g PPF to 0.5 g/g PPF increased all of the measured mechanical properties of PPF/NVP composites. These results indicate that this biodegradable polymer composite is an attractive candidate for use as a replacement scaffold for trabecular bone. [S0148-0731(00)01203-6]

A Sprayable Biodegradable Polymer Membrane (SBPM) technology: Effect of band width and application rate on water conservation and seedling emergence

2020 ◽  
Vol 230 ◽  
pp. 105900 ◽  
Author(s):  
Michael V. Braunack ◽  
Adriana Zaja ◽  
Kang Tam ◽  
Lana Filipović ◽  
Vilim Filipović ◽  
...  
Keyword(s):  
Biodegradable Polymer ◽  
Water Conservation ◽  
Seedling Emergence ◽  
Application Rate ◽  
Polymer Membrane ◽  
Band Width
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