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.

Preparation and Mechanical Properties of Cotton Stalk Bast Fibers Reinforced Polypropylene Composites

2012 ◽  
Vol 482-484 ◽  
pp. 929-932 ◽  
Author(s):  
Zheng Wu ◽  
Chun Yan Wei ◽  
Li Hua Lv
Keyword(s):  
Mechanical Properties ◽  
Mass Fraction ◽  
Orthogonal Experiment ◽  
Matrix Material ◽  
Processing Condition ◽  
Molding Pressure ◽  
Cotton Stalk ◽  
Cold Forming ◽  
Molding Temperature ◽  
Bast Fibers

The cotton stalk bast fibers are a new kind of natural cellulose fibers, which have the similar properties as the flax fibers. Polypropylene (PP) is a type of matrix material and commonly used in composites. The cotton stalk bast fibers as reinforced materials and PP as matrix were used to make a new kind of composite in the experiment. The composites were prepared by mixing, molding and cold forming. Orthogonal experiment table including mass fraction of fibers, molding temperature, molding pressure and molding time was devised. Then the flexural strength, tensile strength and impact strength were tested and the analysis of range was done. The optimal processing condition was obtained as follows: mass fraction of fibers was 30%, molding temperature was 190°C, molding pressure was 12MPa and molding time was 480s. The result showed that the cotton stalk bast fibers reinforced PP composites had good mechanical properties.

scholarly journals Mechanical properties of polylactic acid composites reinforced with cotton gin waste and flax fibers

2017 ◽  
Vol 200 ◽  
pp. 370-376 ◽  
Author(s):  
Rohan M. Bajracharya ◽  
Dilpreet S. Bajwa ◽  
Sreekala G. Bajwa
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
Flax Fibers ◽  
Cotton Gin Waste ◽  
Cotton Gin

Study of Flame-Retardant Cotton Stalk Bast Fibers Reinforced Polylactic Acid Composites

2012 ◽  
Vol 583 ◽  
pp. 228-231 ◽  
Author(s):  
Zheng Wu ◽  
Chun Yan Wei ◽  
Yong Zhu Cui ◽  
Li Hua Lv ◽  
Wang Xiao
Keyword(s):  
Flame Retardant ◽  
Mass Fraction ◽  
Flame Retardants ◽  
Orthogonal Experiment ◽  
Processing Condition ◽  
Cotton Stalk ◽  
Molding Temperature ◽  
Flame Retardant Property ◽  
Bast Fibers ◽  
Optimal Processing

As PLA composites are easy to kindle, making flame-retardant composites is particularly important. PLA can be widely used after improvement. In the process of making cotton stalk bast fibers reinforced PLA composites, adding APP/PER a type of flame-retardants in the experiment produces a kind of composites with good flame-retardant property. Orthogonal experiment table including length and mass fraction of fibers, molding temperature and addition of flame-retardants was devised. Then the study focused on the flame-retardant property of the composites and the analysis of range and variance were done. The optimal processing condition was obtained: length of fibers was 8mm, mass fraction of fibers was 30%, molding temperature was 175°C and addition of flame-retardants was 10%. Fibers reinforced PLA composites with APP/PER got better flame-retardant property than the composites without APP/PER, with the LOI rising 6.61. This kind of composite can be extensively applied in many fields.

Effects of Fiber Mass Fraction and Alkali Concentration on Mechanical Properties of Biodegradable Composites

2010 ◽  
Vol 152-153 ◽  
pp. 1677-1682
Author(s):  
Zhi Yong Qin ◽  
Yi Qiang Wu ◽  
Xin Gong Li ◽  
Yan Qing
Keyword(s):  
Mechanical Properties ◽  
Mass Fraction ◽  
Alkali Treatment ◽  
Wood Fiber ◽  
Alkali Concentration ◽  
Molding Machine ◽  
Screw Extruder ◽  
Biodegradable Composites ◽  
Twin Screw ◽  
Scanning Electron

Biodegradable composites of polylactic acid reinforced with wood fiber are fabricated by using twin screw extruder followed by the injection molding machine. The effects of fiber mass fraction and alkali concentration on mechanical properties of biodegradable composites are investigated. The results show that the mechanical properties of biodegradable composites presented tendency which reduced first, elevated, and again reduced along with fiber mass fraction increased, after the alkali treatment, the mechanical properties of biodegradable composites have the tendency which increased first and then reduced, when the concentration of alkali solution is 8%, both the tensile strength and impact strength are best. The scanning electron microscope and Infrared Spectrum Analysis are also used for examination of biodegradable composites.

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.

Fabrication and Mechanical Properties Analysis of Flame-Retardant Fiberboards Made of Abandoned Flax Fibers and Polyurethanes

2012 ◽  
Vol 627 ◽  
pp. 892-895 ◽  
Author(s):  
Li Hua Lv ◽  
Min Zuo ◽  
Chun Yan Wei ◽  
Xiao Wang ◽  
Ke Wang
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Hot Pressing ◽  
Mass Fraction ◽  
Bending Strength ◽  
Range Analysis ◽  
Pressing Temperature ◽  
Limiting Oxygen Index ◽  
Flax Fibers ◽  
Pressing Time

In this paper, abandoned flax fibers were adopted as reinforcing materials, polyurethane particles were adopted as matrix materials. Through blend mastication and hot-pressing methods to exploit flame-retardant fiberboards, which were made of abandoned flax fibers and polyurethanes. This paper explored the mechanical properties and flame-retardant property.Tensile strength, bending strength and impact strength were selected as mechanical properties' test index, limiting oxygen index was selected as flame-retardant property's test index. Abandoned flax fibers mass fraction, hot-pressing temperature, hot-pressing time and flame-retardant mass fraction acted as level of factor. The optimized processing conditions were concluded through orthogonal experiment and the range analysis: abandoned flax fibers mass fraction 45%, hot-pressing temperature 170°C, hot-pressing time 6 min, flame-retardant mass fraction 10%. This paper studied the solution of the abandoned fibers’ reuse. At the same time, it provided theoretical guidance for the further development of flame- retardant polyurethane fiberboard.

Process and Mechanical Properties of Basalt Fiber/Polylactic Acid Composites

2012 ◽  
Vol 193-194 ◽  
pp. 329-332 ◽  
Author(s):  
Li Hua Lv ◽  
Gui Bin Liu ◽  
Dan Zhou
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
Hot Pressing ◽  
Mass Fraction ◽  
Bending Strength ◽  
Matrix Material ◽  
Basalt Fiber ◽  
Pressing Pressure ◽  
Pressing Temperature ◽  
Pressing Time

In this paper, the basalt fiber/polylactic acid composites were prepared by laying-up hot-pressing process, using PLA sheet as the matrix material and basalt fiber fabrics as the reinforced material, besides, the mechanical properties were studied and the parameters of hot-pressing were optimized. PLA mass fraction, heat pressing temperature, heat pressing pressure and heat pressing time were selected as the four main influence factors and tensile strength and bending strength were taken as the test indexes, the best processing conditions: PLA mass fraction 63%, Heat pressing temperature 195 °C, Heat pressing pressure 7MPa, Heat pressing time 10min were optimized through orthogonal experiment and range analysis. The significance of the study was providing theoretical guidance for the further development of high-performance basalt fiber composites.

Study of Heat-Resistant Cotton Stalk Bast Fibers Reinforced Polylactic Acid Composites

2012 ◽  
Vol 583 ◽  
pp. 53-56 ◽  
Author(s):  
Zheng Wu ◽  
Chun Yan Wei ◽  
Yong Zhu Cui ◽  
Li Hua Lv ◽  
Wang Xiao
Keyword(s):  
Heat Resistance ◽  
Mass Fraction ◽  
Orthogonal Experiment ◽  
Processing Condition ◽  
Cotton Stalk ◽  
Molding Temperature ◽  
Bast Fibers ◽  
Optimal Processing ◽  
Good Heat Resistance ◽  
Good Heat

The heat-resistance of PLA is so poor that its application area was limited. It can be widely applied after improvement. In the process of making cotton stalk bast fibers reinforced PLA composites, adding TAIC a type of cross-linking agent in the experiment produces a kind of composites with good heat-resistance. Orthogonal experiment table including length and mass fraction of fibers, molding temperature and addition of TAIC was devised. Then the study focused on the heat-resistance of the composites and the analysis of range and variance were done. The optimal processing condition was obtained: length of fibers was 10mm, mass fraction of fibers was 30%, molding temperature was 175°C and addition of TAIC was 1%. In addition, fibers reinforced PLA composites without TAIC had better heat-resistance than the pure PLA material, the HDT raised 54°C, and the composites added TAIC obtained the best heat-resistance of all. This composite can be extensively used in many fields.

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.

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