A series of polylactic acid/hydroxyapatite/graphene oxide composite (PLA/HA/GO) were fabricated via solution blending and casting method using N,N-dimethyl-formamide (DMF) and CH 2 Cl 2 as mutual solvents. The physicochemical properties of the resulting composites were characterized by means of FT-IR, SEM, TEM, Raman spectra, XRD and N 2 -physisorption. Particularly, the thermal stabilities, hydrophobic and mechanical properties of PLA/HA/GO composites were systematically investigated. The influences of GO content on thermal stabilities, hydrophobic and mechanical properties of the composites were also evaluated. The results showed that the addition of GO and HA not only improved the thermal stability of PLA, but also improved the hydrophobic property of PLA-based composites. By compared with the PLA/HA/GO composite, the tensile strength of pristine PLA is slight high. The tensile strength and hardness of PLA/HA/GO composites increased with the increase of GO content. The obtained PLA/HA/GO composite may be a promising material for load-bearing orthopedic implants.
A series of Cu-doped mesoporous graphitic carbon nitride (Cu/mpg-C3N4) photocatalysts with Cu introduced from 0.1 to 5 wt% were prepared using cupric chloride and melamine as precursors.
Partially
biobased thermoplastic vulcanizates (TPVs) with shape
memory properties were prepared by in situ dynamic vulcanization of
eucommia ulmoides gum (EUG) and polyolefin elastomer (POE). The cross-linked
EUG phase dispersed in POE matrix acted as a framework structure throughout
the POE phase, which limited irreversible deformation of POE and provided
sufficient resilience force to drive the POE molecular chains to recover
their initial shape. The shape memory results demonstrated that EUG/POE
TPVs exhibited excellent shape memory properties with high shape fixity
and shape recovery rate (all above 95%). The EUG with the dimensions
of 0.4–1.6 μm dispersed in the POE matrix, and the more
EUG phase resulted in large EUG aggregates. The cross-linked EUG phase
considerably improved the permanent deformation of POE, and the tensile
set linearly decreases from 134% to 4% with increasing EUG contents.
The mechanical and shape memory properties of EUG/POE TPVs changed
little after being reprocessed twice, exhibiting good reprocessability.
All of these remarkable advantages make EUG/POE TPVs good candidates
for shape memory materials.
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