Journal of Applied Polymer Science最新文献

This study successfully prepared and evaluated polyvinyl alcohol (PVA)/chitosan (CS)/cellulose nanofiber (CNF) composite hydrogels for aqueous dye removal, with methylene blue (MB) used as a model pollutant. The hydrogels were fabricated using a freeze–thaw cycling method to form a three-dimensional cross-linked network. Their microstructure, mechanical properties, adhesion behavior, and MB adsorption performance were systematically investigated. The results showed that the hydrogel exhibited a high adsorption capacity for MB, with a maximum equilibrium adsorption of 79.5 mg/g. The adsorption process followed the pseudo-second-order kinetic model, suggesting that chemisorption was the dominant mechanism. In addition, the hydrogel demonstrated excellent mechanical properties, environmental stability, and biodegradability, indicating its potential as a sustainable material for eco-friendly dye adsorption applications. This study provides new insights into the development of efficient and environmentally friendly adsorbents for dye removal from aqueous systems.

The viscosity of polycarbosilane (PCS) polymers is not advantageous for free forming. Various fillers and heat are used to obtain a formable paste. Due to the low yield stress, structures and preforms tend to slump or resin will flow out, especially during the curing of the polymer. B-staging of PCS allows for a more stable structure from room temperature until the full cure of the allyl groups occurs with heat. Additionally, hydrosilation is an effective means of crosslinking at room temperature and controlling viscosity. A network structure was formed in SMP-10 using silane and a vinyl-based crosslinker to bridge each polymer chain. Pt addition catalysts were added to enhance the increase in viscosity to make a lightly crosslinked gel to aid in thickening and forming and to improve the ceramic yield at 1000°C. This enables several options for controlling rheology and improving the properties of preceramic polymers to avoid slumping during curing.

Metal materials in engineering structures face severe corrosion challenges. Waterborne polyurethane (WPU) is widely regarded as a sustainable coating alternative and holds potential in corrosion protection; nevertheless, its actual usage is constrained by inadequate mechanical characteristics, limited water resistance, and insufficient corrosion resistance. In this study, graphene oxide (GO) and nano-cerium oxide (CeO₂) were introduced as functional fillers into a WPU matrix via physical blending to prepare three composite materials (WPU-GO, WPU-Ce, and WPU-GO-Ce). The influence of nanofillers on the characteristics of WPU was comprehensively examined. The findings indicated that the addition of nanofillers substantially improves the overall properties of the composites. Specifically, CeO₂ (at 0.25 wt%) interacts with the hard segments of polyurethane through interfacial hydroxyl groups, increasing the tensile strength of WPU-Ce to 31.37 MPa. The synergistic effect of GO (at 0.125 wt%) and CeO₂ (at 0.125 wt%) in the WPU-GO-Ce system forms a dense physical barrier, achieving an impedance modulus of 8.03 × 10⁵ Ω·cm² two orders of magnitude higher than WPU, indicating optimal corrosion resistance. Additionally, nanofillers delay corrosive medium diffusion via a “maze effect,” while improving thermal stability (T₅₀ up to 404.63°C) and UV shielding performance (near-zero transmittance across the entire UV spectrum). This work reveals that the GO/CeO₂ co-modification strategy significantly enhances the multifunctional performance of WPU coatings, providing theoretical and technical support for long-term corrosion protection in complex environments.

Benzoxazine-containing phthalonitrile (PN) resins exhibit advantages such as low curing temperature, high thermal resistance, and stable electrical properties. However, the relatively high dielectric constant (3.8 at 1 MHz) limits its applications in the electronics field. In this work, bismaleimide resin (BDM) with low dielectric constant and an allyl-containing bismhenol A (DBA) monomer as a curing agent were innovatively introduced to copolymerize with the PN resin, aiming to further reduce the curing temperature and dielectric constant. To fully exploit the advantages of BDM, it was pre-polymerized with DBA to obtain BA resin. The influence of BA resin content on the properties of the copolymerized resin (Poly(PN-BA)s) was systematically investigated. The results show that the introduction of BA resin improves the curing reactivity of the PN-BA, with a shortening of the gelation time by nearly 200 s (from 631 s of PN to 434 s of PN-30BA, a decrease of 31.2%), while maintaining good processability. The Poly(PN-BA)s retain the excellent high-temperature resistance of Poly(PN) while effectively improving the dielectric properties, reducing the dielectric constant to 3.29. Furthermore, the glass fiber-reinforced composites G(PN-BA)s have good bonding of the resin to the fiber interface, and the bending strength was enhanced from 351 to 554 MPa, which increased by 58%. Therefore, the Poly(PN-BA)s exhibits promising application prospects and provides an excellent technical solution for PCB resins.

Hydrogels are types of stable gel materials formed by the dissolution of water-soluble polymers, which have good biocompatibility, swelling features, and anti-deformation. In this work, Ti₃C₂ MXene sheets are prepared by the etching method with hydrofluoric acid (HF) and surface modified by tannic acid (TA) to form TA-MXene sheets. The polyacrylamide (PAM) hybrid hydrogels with double networks were based on a copolymer with a mass ratio of acrylamide (AM) and acrylic acid (AA) at 7:1. TA-MXene sheets and CuCl₂ were utilized as conductive reinforcements. By in situ polymerization, the PAM hybrid hydrogels synergistically reinforced by TA-MXene/copper ion (Cu²⁺) with double conductive networks were successfully fabricated. The compressive modulus of the TA-MXene/Cu²⁺/PAM hybrid hydrogels is increased by 152.96% compared to PAM hydrogels. Under the synergistic effects of TA-MXene and Cu²⁺, the conductivity of the TA-MXene/Cu²⁺/PAM hybrid hydrogel is enhanced by 80.76%.

Polylactic acid (PLA) is widely used in fused filament fabrication (FFF) due to its biocompatibility and low cost, but its inherent brittleness and limited mechanical strength restrict its application in load-bearing and structural components. Reinforcing PLA with nanofillers such as carbon fiber (CF), graphene (Gr), and multi-walled carbon nanotubes (MWCNTs) offers a promising route to overcome these limitations, yet the combined influence of build parameters and reinforcement type remains underexplored. In this study, PLA composites were fabricated via FFF with systematic variation of raster orientation (RO), layer height (LH), and print speed (PS), and their tensile, compressive, and flexural properties were evaluated. Among the reinforcements, PLA-MWCNT composites demonstrated the highest compressive strength (121.25 MPa at 0° RO, 0.1 mm LH, 30 mm/s PS), while PLA-CF composites exhibited superior tensile performance, and PLA-Gr composites offered balanced mechanical behavior. To predict and optimize these outcomes, machine learning (ML) models—Linear Regression, Random Forest Regression, and Extreme Gradient Boosting Regression—were employed, with XGBR achieving the highest accuracy (R ² up to 0.99). This integrated experimental–computational framework identifies reinforcement–parameter combinations most suitable for real-world applications such as lightweight automotive components while also highlighting the need for larger datasets to further strengthen ML-driven predictions.