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

Abstract

Poly(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 21 . DSC results indicate that the addition of CNCs improved both the crystallization capacity and moving capability of PGS molecular chain.

The influence of nano‐PS particle on structure evolution and electrical properties of PP/PS

“…Then carrier mobility and carrier density is decreased, and finally they can disperse uniformly in composites. These results are similar to polymer inorganic nanocomposites . On the other hand, the weak points that have bad effect on electrical properties on interface regions will decrease, resulting from the presence of PP‐g‐PS copolymers that improves the compatibility between PP and PS.…”

“…Two‐parameter Weibull distribution method was used to treat the experimental data. The Weibull distribution was described as follows: where E represents the experimental value of breakdown strength, α is the characteristic value of dielectric breakdown strength representing the breakdown strength at the cumulative breakdown probability of 63.2%, and β is the shape parameter, reflects the data scatter, and F ( E , α , β ) is the cumulative probability of breakdown. According to the IEEE Standard 930–2004, a simple way to approximate the probability of breakdown was described as follows: where P i is the cumulative probability of the i th breakdown data, i is the order of the experimental value of breakdown strength, and n is the number of specimens of each sample ( n = 15 in this study).…”

“…In recent years, much attention has been paid to polymer nanocomposites insulation materials . Nano‐fillers, especially inorganic fillers, were widely reported to have positive influence on improving breakdown strength, enhancing volume resistivity, and suppressing space charge accumulation .…”

Poly(glycerol sebacate) biomaterial: synthesis and biomedical applications

“…37 This led to a notable enhancement in tensile strength and modulus, with improved crosslinking density as well as hydrophilicity. Various composites were prepared with cellulose-based, carbon nanotube-based and silicon-based nanofillers to modify the physical characteristics.…”

Dip-and-Drag Lateral Force Spectroscopy for Measuring Adhesive Forces between Nanofibers

“…6,7 The mechanical properties of a range of fibrous materials have been studied using compression, uni-and bi-axial tensile testing and small-amplitude oscillatory shear. [8][9][10][11][12][13][14][15][16][17][18] The results from these studies indicate that the mechanics of random fiber networks is defined by the intrinsic mechanical properties of nanofibers, surface interactions between fibers, the network microstructure, and number and nature of entanglements and/or crosslinks, as well as the solvent properties that affect the Hamaker constant and thus the adhesive interactions between fibers.…”