Surface functionalization of polylactic acid fibers with alendronate groups does not improve the mechanical properties of fiber-reinforced calcium phosphate cements

2019 ◽  
Vol 90 ◽  
pp. 472-483 ◽  
Author(s):  
Daniela-Geta Petre ◽  
Nathan W. Kucko ◽  
Anna Abbadessa ◽  
Tina Vermonden ◽  
Alessandro Polini ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Calcium Phosphate ◽  
Polylactic Acid ◽  
Surface Functionalization ◽  
Fiber Reinforced ◽  
Calcium Phosphate Cements

scholarly journals Preparation of Long Sisal Fiber-Reinforced Polylactic Acid Biocomposites with Highly Improved Mechanical Performance

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1124
Author(s):  
Zhifang Liang ◽  
Hongwu Wu ◽  
Ruipu Liu ◽  
Caiquan Wu
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
Mechanical Performance ◽  
Tensile Elongation ◽  
Sisal Fiber ◽  
Fiber Reinforced ◽  
Impact Performance ◽  
The Matrix ◽  
Blending Process ◽  
Extension Direction

Green biodegradable plastics have come into focus as an alternative to restricted plastic products. In this paper, continuous long sisal fiber (SF)/polylactic acid (PLA) premixes were prepared by an extrusion-rolling blending process, and then unidirectional continuous long sisal fiber-reinforced PLA composites (LSFCs) were prepared by compression molding to explore the effect of long fiber on the mechanical properties of sisal fiber-reinforced composites. As a comparison, random short sisal fiber-reinforced PLA composites (SSFCs) were prepared by open milling and molding. The experimental results show that continuous long sisal fiber/PLA premixes could be successfully obtained from this pre-blending process. It was found that the presence of long sisal fibers could greatly improve the tensile strength of LSFC material along the fiber extension direction and slightly increase its tensile elongation. Continuous long fibers in LSFCs could greatly participate in supporting the load applied to the composite material. However, when comparing the mechanical properties of the two composite materials, the poor compatibility between the fiber and the matrix made fiber’s reinforcement effect not well reflected in SSFCs. Similarly, the flexural performance and impact performance of LSFCs had been improved considerably versus SSFCs.

Synthesis of Alpha-Tricalcium Phosphate by Wet Reaction and Evaluation of Mechanical Properties

2012 ◽  
Vol 727-728 ◽  
pp. 1164-1169 ◽  
Author(s):  
Mônica Beatriz Thürmer ◽  
Rafaela Silveira Vieira ◽  
Juliana Machado Fernandes ◽  
Wilbur Trajano Guerin Coelho ◽  
Luis Alberto Santos
Keyword(s):  
Mechanical Properties ◽  
Calcium Phosphate ◽  
Tricalcium Phosphate ◽  
Calcium Nitrate ◽  
Chemical Precipitation ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Calcium Phosphate Cements

Calcium phosphate cements have bioactivity and osteoconductivity and can be molded and replace portions of bone tissue. The aim of this work was to study the obtainment of α-tricalcium phosphate, the main phase of calcium phosphate cement, by wet reaction from calcium nitrate and phosphoric acid. There are no reports about α-tricalcium phosphate obtained by this method. Two routes of chemical precipitation were evaluated and the use of two calcinations temperatures to obtain the phase of cement. The influence of calcination temperature on the mechanical properties of cement was evaluated. Cement samples were characterized by particle size analysis, X-ray diffraction, mechanical strength and scanning electron microscopy. The results demonstrate the strong influence of synthesis route on the crystalline phases of cement and the influence of concentration of reactants on the product of the reaction, as well as, on the mechanical properties of cement.

Effect of polyethylene glycol on mechanical properties of bamboo fiber‐reinforced polylactic acid composites

2019 ◽  
Vol 136 (26) ◽  
pp. 47709 ◽  
Author(s):  
Haibo Long ◽  
Zhiqiang Wu ◽  
Qianqian Dong ◽  
Yuting Shen ◽  
Wuyi Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyethylene Glycol ◽  
Polylactic Acid ◽  
Bamboo Fiber ◽  
Fiber Reinforced

scholarly journals Enhancing the mechanical properties of calcium phosphate cements using short-length polyhydroxyalkanoate fibers

2016 ◽  
Vol 124 (2) ◽  
pp. 180-183 ◽  
Author(s):  
Toru OGASAWARA ◽  
Takenori SAWAMURA ◽  
Hirotaka MAEDA ◽  
Akiko OBATA ◽  
Hitoshi HIRATA ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Calcium Phosphate ◽  
Short Length ◽  
Calcium Phosphate Cements

Role of macropore size in the mechanical properties and in vitro degradation of porous calcium phosphate cements

2010 ◽  
Vol 64 (18) ◽  
pp. 2028-2031 ◽  
Author(s):  
Bai Feng ◽  
Meng Guolin ◽  
Yuan Yuan ◽  
Liu Changshen ◽  
Wang Zhen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Calcium Phosphate ◽  
In Vitro Degradation ◽  
Calcium Phosphate Cements

scholarly journals Preparation, Structural Characterization, and Biomedical Applications of Gypsum-Based Nanocomposite Bone Cements

2021 ◽  
Author(s):  
Hesham F. El-Maghraby ◽  
Yaser E. Greish
Keyword(s):  
Mechanical Properties ◽  
Calcium Phosphate ◽  
Structural Characterization ◽  
Room Temperature ◽  
Bone Cements ◽  
Calcium Phosphate Cements ◽  
Metallic Implants ◽  
Hard Tissues ◽  
Subsequent Conversion ◽  
High Degree

Hard tissues are natural nanocomposites comprising collagen nanofibers that are interlocked with hydroxyapatite (HAp) nanocrystallites. This mechanical interlocking at the nanoscale provides the unique properties of hard tissues (bone and teeth). Upon fracture, cements are usually used for treatment of simple fractures or as an adhesive for the treatment of complicated fractures that require the use of metallic implants. Most of the commercially available bone cements are polymer-based, and lack the required bioactivity for a successful cementation. Besides calcium phosphate cements, gypsum is one of the early recognized and used biomaterials as a basi for a self-setting cementation. It is based on the controlled hydration of plaster of Paris at room temperature and its subsequent conversion to a self-setting solid gypsum product. In our work, we have taken this process further towards the development of a set of nanocomposites that have enhanced bioactivity and mechanical properties. This chapter will outline the formation, characterization, and properties of gypsum-based nanocomposites for bone cement applications. These modified cements can be formulated at room temperature and have been shown to possess a high degree of bioactivity, and are considered potential candidates for bone fracture and defect treatment.

scholarly journals Effect of Extrusion Temperature on the Physico-Mechanical Properties of Unidirectional Wood Fiber-Reinforced Polylactic Acid Composite (WFRPC) Components Using Fused Deposition Modeling

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 976 ◽  
Author(s):  
Teng-Chun Yang
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
Fused Deposition Modeling ◽  
Wood Fiber ◽  
Color Difference ◽  
Extrusion Temperature ◽  
Fiber Reinforced ◽  
Substantial Impact ◽  
Fused Deposition ◽  
Deposition Modeling

Wood fiber-reinforced polylactic acid (PLA) composites (WFRPCs) were used as a filament to manufacture the unidirectional WFRPC components by means of fused deposition modeling (FDM). The physico-mechanical properties of the WFRPC components printed at different extrusion temperatures (200, 210, 220, and 230 °C) were determined. The results revealed that most of the physical properties (moisture content, surface roughness, water absorption rate, and thickness swelling rate) of the printed WFRPC component were not significantly influenced by extrusion temperature, while its density and color difference increased as the extrusion temperature increased. Additionally, the tensile and flexural properties of the FDM-printed WFRPC component decreased when the extrusion temperature was more than 200 °C, whereas the compressive strength and internal bond strength increased by 15.1% and 24.3%, respectively, when the extrusion temperature was increased from 200 to 230 °C. Furthermore, scanning electronic microscopy (SEM) demonstrated that the fracture surface of the tensile component printed at a higher extrusion temperature exhibited a better compatibility at fiber/PLA interfaces and good adhesion between the extruded filament segments. These results indicate that the FDM printing process using different extrusion temperatures has a substantial impact on the surface color, density, and mechanical properties of the printed WFRPC component.

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