Field performance on lettuce crops of poly(butylene adipate‐co‐terephthalate)/polylactic acid as alternative biodegradable composites mulching films

2020 ◽  
Vol 138 (11) ◽  
pp. 50020
Author(s):  
Alana G. Souza ◽  
Rafaela R. Ferreira ◽  
Julio Harada ◽  
Derval S. Rosa
Keyword(s):  
Polylactic Acid ◽  
Field Performance ◽  
Biodegradable Composites ◽  
Mulching Films

Preparation and Mechanical Properties of Cotton Stalk Bast Fibers Reinforced Polylactic Acid Biodegradable Composites

2011 ◽  
Vol 399-401 ◽  
pp. 1367-1371
Author(s):  
Zheng Wu ◽  
Chun Yan Wei ◽  
Zhi Fang Tian
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
Mass Fraction ◽  
Molding Pressure ◽  
Molding Temperature ◽  
Bast Fibers ◽  
Flax Fibers ◽  
Biodegradable Composites ◽  
Cotton Stalks ◽  
Reinforced Materials

The cotton stalks bast fiber was a new kind of natural cellulose fiber, the fibers had the similar properties as the flax fibers. Polylactic acid (PLA) is a class of biodegradable matrix material. As the flax fibers can be reinforced materials and then compounded with PLA, cotton stalks bast fibers as reinforced materials and PLA as matrix were used to make a kind of green and biodegradable composite in the experiment. The composites were prepared by mixing, molding and cold forming. Orthogonal experiment table including length of the fibers, mass fraction of PLA, molding temperature and molding pressure was devised. Then the tensile strength, flexural strength and impact strength were tested and the analysis of range and variance was done. The optimal processing condition was obtained as follows: length of the fibers was 6mm, mass fraction of PLA was 75%, molding temperature was 175°C and molding pressure was 12MPa. The result showed that the cotton stalks bast fibers reinforced PLA biodegradable composites had good mechanical properties. Through this study waste cotton stalks basts were turned into useful resources and provided a kind of environmentally friendly composites.

scholarly journals Biodegradable films and spray coatings as eco-friendly alternative to petro-chemical derived mulching films

2013 ◽  
Vol 44 (2s) ◽  
Author(s):  
G. Vox ◽  
G. Santagata ◽  
M. Malinconico ◽  
B. Immirzi ◽  
G. Scarascia Mugnozza ◽  
...  
Keyword(s):  
Raw Materials ◽  
Bacterial Flora ◽  
Field Performance ◽  
Biodegradable Materials ◽  
Natural Polymers ◽  
Formulation Development ◽  
Spray Coatings ◽  
Plastic Mulching ◽  
Innovative Materials ◽  
Mulching Films

The use of plastic mulching films in horticulture causes the serious drawback of huge amount of wastes to be disposed of at the end of their lifetime. Several pre-competitive research products based on raw materials coming from renewable sources were recently developed to be used as biodegradable materials for soil mulching. Biodegradable materials are designed in order both to retain their mechanical and physical properties during their using time and to degrade at the end of their lifetime. These materials can be integrated directly in the soil in order to biodegrade because the bacterial flora transforms them in carbon dioxide or methane, water and biomass. The innovative materials can be obtained using natural polymers, such as starch, cellulose, chitosan, alginate and glucomannan. Biodegradable extruded mulching films were performed by means of thermo-plasticizing process. Spray mulch coatings were realized directly in field, by spraying water solutions based on natural polysaccharides, thus covering the cultivated soil with a protective thin geo-membrane. In this paper an overview on the formulation development, processing understanding, field performance, mechanical and radiometric properties of these innovative materials for soil mulching is presented. In field the biodegradable mulching films showed suitable mechanical properties if compared to the low density polyethylene films. The radiometric properties and their effect on the temperature condition and on weed control in the mulched soil were evaluated too. At the end of their lifetime the biodegradable materials were shattered and buried into the soil together with plants.

Effect of Calcium Phosphate on Tensile and Rheological Properties of Polylactic Acid (PLA)

2019 ◽  
Vol 969 ◽  
pp. 404-408
Author(s):  
Govind Sahu ◽  
M.S. Rajput ◽  
S.P. Mahapatra
Keyword(s):  
Mechanical Properties ◽  
Calcium Phosphate ◽  
Polylactic Acid ◽  
Ring Opening ◽  
Food Packaging ◽  
Biomedical Application ◽  
Ring Opening Polymerization ◽  
Natural Environments ◽  
Melt Mixing ◽  
Biodegradable Composites

From the last few decades, biodegradable composites have become best alternatives over the petro based polymer because these degrade in the simple compound in the natural environments. Among the available biodegradable polymers, polylactic acid (PLA) is more popular due to its biocompatibility and mechanical properties, that can be used in the biomedical application, such as sutures, bone and ligament fixation screws etc. In this study, synthesis of PLA was performed by ring opening polymerization and Calcium phosphate/Polylactic acid (PLA) bio-composites were prepared by melt mixing technique. Tensile properties of these composites are investigated to assess its feasibility in biomedical and food packaging application.

Experimental investigation on fabrication and thermal-stamping of woven jute/polylactic acid biocomposites

2018 ◽  
Vol 53 (7) ◽  
pp. 851-861 ◽  
Author(s):  
Siqi Du ◽  
Xiongqi Peng ◽  
Hailin Gu
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
Alkali Treatment ◽  
Tensile Tests ◽  
Woven Fabrics ◽  
Scanning Calorimetry ◽  
Biodegradable Composites ◽  
One Step ◽  
Jute Fabrics ◽  
Complicated Geometries

Jute woven fabrics in as-received and alkali-treated conditions were respectively combined with polylactic acid resin to fabricate completely biodegradable composites by compression molding in one step. Scanning electron microscopy and differential scanning calorimetry and tensile tests were conducted to estimate the surface morphology, thermal, and mechanical properties of jute fabrics and the composites manufactured. The formability of the composites was evaluated by a thermal-stamping experiment. The results demonstrate that alkali treatment removes the surface impurities of fabrics and refine the fiber structures, lifting the thermal property of composites. As for the mechanical properties, the strength of the fabrics and composites declines while the modulus increases after alkali treatment of fabrics. Although some defects occur, the thermal-stamping experiments confirm the possibility of shaping jute/polylactic acid composite into complicated geometries. And the formability of the composites is influenced by many factors including sample sizes, the holding time of temperature, layup sequence, and so on while the number of layer makes no obvious difference to it.

Mechanical and Thermal Properties of Polylactic Acid Filled Rice Straw

2015 ◽  
Vol 815 ◽  
pp. 34-38
Author(s):  
Nurul Hani Md Zubir ◽  
S.T. Sam ◽  
H. Kamarudin ◽  
S. Ragunathan ◽  
N.Z. Noriman ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
Rice Straw ◽  
Natural Fiber ◽  
Mechanical And Thermal Properties ◽  
Elongation At Break ◽  
Fiber Loading ◽  
Biodegradable Composites ◽  
Roll Mill ◽  
Thermal Stability Of

Natural fiber reinforced polylactic acid based biocomposites are broadly considered by the researchers to compete with non-renewable petroleum based products. In this study, the biodegradable composites which are the polylactic acid, PLA and rice straw, RS were prepared by using heated two roll-mill at 180°C. Mechanical properties showed that the tensile strength and elongation at break, Eb decreased with the increasing of RS while the Young’s modulus had increased. The TGA results confirmed that thermal stability of PLA with RS composites decreased when the RS fiber loading increased.

Early field performance of Acacia koa seedlings grown under subirrigation and overhead irrigation

2011 ◽  
Vol 12 (2) ◽  
pp. 94-99 ◽  
Author(s):  
A. S. Davis ◽  
J. R. Pinto ◽  
D. F. Jacobs
Keyword(s):  
Field Performance ◽  
Acacia Koa ◽  
Overhead Irrigation
Sign in / Sign up

Export Citation Format

Share Document