Degradation Properties Of Composites Research Articles

Influence of wheat stalk nanocellulose on structural, mechanical, thermal, surface and degradation properties of composites with poly(butylene adipate-co-terephthalate)

Influence of wheat stalk nanocellulose on structural, mechanical, thermal, surface and degradation properties of composites with poly(butylene adipate-co-terephthalate)

Mechanical and degradation properties of poly(methyl methacrylate) cement/borate bioactive glass composites.

Bone cement is used extensively in orthopedics to anchor prostheses to bone and fill voids. Incorporating bioactive glass into poly(methyl methacrylate) (PMMA)-based bone cement could potentially improve its effectiveness for these tasks. This study characterizes the mechanical and degradation properties of composites containing PMMA-based bone cement and particles of borate bioactive glass designated as 13-93B3. Glass particles of size 5, 33, and 100 μm were mixed with PMMA bone cement to create composites containing 20, 30, and 40 wt % glass. Composites and a bone cement control were soaked in phosphate-buffered saline. Compressive strength, Young's modulus, weight loss, water uptake, solution pH, and ionic concentrations were measured over 21 days. The compressive strengths of composites decreased over 21 days. Average Young's moduli of the composites remained below 3 GPa. Weight loss and water uptake of specimens did not exceed 2 and 6%, respectively. Boron concentrations and pH of all solutions increased over time, with higher glass weight fractions leading to higher pH values. Results demonstrated that the composite can sustain glass degradation and ionic release without compromising short-term mechanical strength.

Synthesis and characterization of hydroxyapatite/silica composites based on cockle shells waste and tin tailings

Hydroxyapatite is a biocompatible material that has great potential in the development of scaffold in the bone tissue engineering. To satisfy the needs of mechanical properties and the time of degradation to support the bone growth, currently hydroxyapatite-based composite material is being developed. One of the fillers that can be used is silica because it also has excellent biocompatible properties. In this study, hydroxyapatite/silica composites were prepared using cockle shell waste and tin tailings as raw materials. The study aims to utilize the waste produced in the maritime and mining sectors to move towards sustainable industries. The characteristics observed in this study are crystal characteristics and degradation properties of composites.

Preparation and characterization of poly(glycerol sebacate)/cellulose nanocrystals elastomeric composites

ABSTRACTPoly(glycerol sebacate) (PGS) is one of the new elastomers used for soft tissue engineering, while improving its limited mechanical strength is the biggest challenge. In this work, a novel biodegradable elastomer composite PGS/cellulose nanocrystals (CNCs) was prepared by solution‐casting method and the mechanical properties, sol–gel contents, crosslink density, and hydrophilic performance were characterized. The thermal and degradation properties of composites were also investigated. Results show that the addition of CNCs into PGS resulted a significant improvement in tensile strength and modulus, as well as the crosslink density and the hydrophilicity of PGS. When the CNCs loading reached 4 wt %, the tensile strength and modulus of the composite reached 1.5 MPa and 1.9 MPa, respectively, resulting 204% and 158% increase compared to the pure PGS. Prolonging the curing time also improved the strength of both the neat PGS and PGS/CNCs composites according to the association and shift of hydroxy peaks around 3480 cm−1. DSC results indicate that the addition of CNCs improved both the crystallization capacity and moving capability of PGS molecular chain. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42196.