Carbon fiber‐reinforced epoxy composite properties improvement by incorporation of polydopamine sizing at fiber–matrix interface

Abstract

To gain better interfacial and mechanical performances of carbon ber reinforced epoxy resin (CF/EP) composites, the surface modi cation of CF was carried out via a simple mild method. The polydopamine (PDA) was applied to size the CF, as well as the in uence of PDA sizing time on CF were elucidated. As the PDA deposited time increases, a growing number of PDA nanoparticles were adhered on CF surface, associating with appearance of PDA agglomerates. Through analyzing the results, the optimum PDA sized time was 24 h. The introduction of PDA increase the chemical reaction and mechanical interlocking between ber and matrix. Compared with unsized CF, the tensile strength of PDA 24 h sized CF was improved by 27.0%, the interlaminar shear strength, exural and impact strength of PDA 24 h sized CF/EP composites increased by 103.7%, 65.6% and 163.6%, respectively. Furthermore, the fracture topographies of CF/EP composite strikingly implied that the PDA has a positive impact on the mechanical performances of CF/EP composites.

Development of Active Antibacterial CEO/CS@PLA Nonwovens and the Application on Food Preservation

“…These infrared characteristic peaks of PLA are in agreement with the reported literature , and are kept in the spectra of the other samples. The modified PLA MB spectrum shows a broad peak between 3240 and 3280 cm –1 corresponding to the stretching vibrations of N–H in –NH 2 and O–H in –OH, respectively, meaning the formation of the PDA layer on the surface of PLA MB. For CS@PLA MB, the characteristic peaks of CS appear at 1642 cm –1 belonging to C–O (amido bond I) and 1538 cm –1 belonging to N–H (amido bond II) .…”

Enhancement of interfacial properties of HMCF composites by constructing of rigid‐flexible interphase through naphthalenediimide with different flexible chain lengths

“…The blue shifts in G band of HMCF in monofilament composites were observed at 4.88, 2.99, 3.31 and 4.00 cm À1 , which was ascribed to the different shrinkages between HMCF and matrix during the cooling process from the mismatch of thermal expansion coefficient. 44,45 In Figure 9E, the thermal residual stress in HMCF-desized/EP composites was 1.39 ± 0.04 GPa, which was due to the shrinkage discrepancy between HMCF and matrix. In contrast to the HMCFdesized/EP composite, lower thermal residual stress was obtained (0.79 ± 0.03 GPa) in HMCF-LN/EP composite, resulting from the partial release of interfacial thermal residual stress from the interphase deformation as flexible chain was longer.…”

Investigating the adhesion and rheological properties of metal organic framework incorporated polyester fiber/zeolite imidazolium salt framework‐67‐modified asphalt composite

“…In an alkaline environment, DA is capable of spontaneous polymerization to form PDA layers that contain abundant functional groups, which serve as a platform for secondary reactions on the surface of PET fibers. 1 Among these, the catechol group possesses metal chelating activity, 28 facilitating the in situ growth of ZIF-67 nanocrystals on the fiber surface by chelating Co 2+ ions in the ligand solution.…”

“…1 This process does not cause any damage to the fiber surface or compromise its strength. 28 The reactive groups within this PDA layer possesses the capacity to adhere to a wide range of organic and inorganic surfaces, through interactions such as hydrogen bonding and π-π stacking. 27,28 Particularly, the catechol moiety present in PDA demonstrates a robust ability to chelate metal ions, thereby providing multiple anchorable binding sites for cobalt metal ions.…”

“…28 The reactive groups within this PDA layer possesses the capacity to adhere to a wide range of organic and inorganic surfaces, through interactions such as hydrogen bonding and π-π stacking. 27,28 Particularly, the catechol moiety present in PDA demonstrates a robust ability to chelate metal ions, thereby providing multiple anchorable binding sites for cobalt metal ions. 29,30 There is no report in literature on this aspect of the ZIF and hence making this study greatly novel and interesting for further investigation.…”