POLYMERS FOR ADVANCED TECHNOLOGIES
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2025
·Vol. 36
·期 8
·e70314
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IF 3.4
Jingyi Bai,Le Liu,Haoting Yang,Yan Wang,Xu Ji,Zirong Luo,Na Kong,Jizhen Zhang,Pengfei Zhao,Yanqiu Shao,Jinlong Tao
Acid coagulation is a widely adopted method in the production of natural rubber (NR). However, it poses several environmental and performance-related challenges, including the use of hazardous reagents, substantial wastewater generation, and deterioration of mechanical properties. To overcome these limitations, this study introduces a novel approach using superabsorbent polymer (SAP) with dual functionality: rapid absorption of bulk water alongside selective removal of nonrubber components. Using SAP, the dry rubber content of fresh natural rubber latex (NRL) was enhanced to 62.7%, yielding concentrated natural rubber (CNR). High-performance NR (CNR) was subsequently obtained through film casting and heat drying. Compared to acid-coagulated natural rubber (ANR), the CNR method significantly reduces wastewater generation associated with acid coagulants and lowers energy consumption by eliminating the need for mechanical dewatering. Importantly, this approach preserves a greater amount of intrinsic proteins and lipids, as well as the relatively intact network structure of NR, which contributes to the superior tensile strength of 22.80 MPa for vulcanized CNR. Furthermore, the enhanced thermal-oxidative aging resistance of CNR is attributed to its higher gel content and preserved structural integrity, making it a promising material for advanced rubber applications. This strategy not only streamlines the coagulation process but also enhances the mechanical properties of the resulting NR, offering a more sustainable and efficient alternative to conventional acid-based methods.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 9
·e70329
·
IF 3.4
Yang Luo,Jun-Peng Wang,Yan Song,Jiahui Ma,Hanjun Gong,Guo Liang Li
Achieving spontaneous contact of damaged interfaces under stimulus-free conditions is a prerequisite and major challenge for intrinsic autonomous self-healing polymers. This study presents an intrinsic self-healing polymer system based on polythioctic acid. Under alkaline conditions, its segments transition from an opaque semicrystalline state to a transparent elastomer with high mobility, enabling spontaneous contact and repair of fractured scratch surfaces. When subjected to damage, the material demonstrates self-healing anticorrosion performance, with the impedance magnitude of the scratched coating at 0.01 Hz increasing from 2.3 × 10 5 Ω·cm 2 at 0 h to 1.4 × 10 7 Ω·cm 2 after 120 h of exposure to 3.5 wt% NaCl without any external stimulus. Furthermore, the material demonstrates outstanding sustainability in terms of recyclability under mild conditions after its service life. This smart polymer design strategy provides a feasible approach for developing intrinsic self-healing polymer systems requiring no external intervention.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 8
·e70303
·
IF 3.4
Shenghua Xu,Weihong Guo
This study develops a sequential surface functionalization strategy for strontium-substituted hydroxyapatite-graft-poly(γ-benzyl-L-glutamate) (Sr10-HA- g -PBLG) porous microspheres to enable in situ scaffold assembly. Hydrazine hydrate-mediated aminolysis and alkaline hydrolysis introduced surface amino (2.87 × 10 −2 mol/g) and carboxyl (1.76 × 10 −2 mol/g) groups, respectively, while preserving structural integrity (verified by FT-IR/XRD/SEM). Subsequent EDC/NHS-activated grafting of 3-amino-1,2-propanediol (AP) achieved 90% efficiency, followed by NaIO 4 oxidation to generate aldehyde functionalities (2.65 × 10 −3 mol/g). Through dynamic imine crosslinking between aldehyde- and amino-functionalized microspheres, 3D scaffolds were formed in situ. The scaffolds exhibited hierarchical porosity (pore size: 40–60 μm, porosity: 85.4% ± 2.3%), exceptional hydration capacity (613.6% ± 24.1% water retention), and enhanced mechanical properties (storage modulus > 13,000 Pa, compressive strength: 0.53 ± 0.02 MPa, tensile strength: 0.068 ± 0.02 MPa). Controlled degradation in PBS (pH = 7.4) showed 46.24% mass loss over 31 weeks. This interfacial engineering approach provides a versatile platform for designing polymer-ceramic hybrids with tailorable surface reactivity and structural adaptability. Adipose-derived stem cells were cultured in vitro, and the dual-fluorescence tracking strategy revealed spatially coordinated cellular colonization patterns, demonstrating porous microsphere scaffold's potential for precision-controlled 3D cell delivery in tissue engineering applications.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 8
·e70306
·
IF 3.4
Caifang Hu,Jianjie Jiang,Xianfei Hu,Wei Wei,Jingcheng Liu,Xiaojie Li
Hyperbranched epoxy resins are efficient toughening modifiers for epoxy thermosets. However, enhancing the mechanical/thermomechanical properties while improving the toughness of the epoxy thermosets remains a challenge. Herein, a new hyperbranched epoxy resin containing a flexible siloxane skeleton (HBPSER) was synthesized for improving the comprehensive performance of epoxy thermosets. Specifically, the phenolic hydroxyl-terminated hyperbranched precursor (HBPS) was first synthesized using 1,3-bis(chloromethyl)-1,1,3,3-tetramethyldisiloxane (A 2 -type monomer) and 3,5-dihydroxybenzoic acid (CB 2 -type monomer), followed by the surface modification with epichlorohydrin to afford the HBPSER. The HBPSER was then utilized for modification of diglycidyl ether of bisphenol A (DGEBA)/methylhexahydrophthalic anhydride (MeHHPA) thermosets. Compared to the neat DGEBA thermoset, the 8 wt% HBPSER-modified epoxy thermoset showed a 139.6%, 99.6%, 88%, 268.2%, 22.8%, and 2.8% increase in impact strength, elongation at break, critical stress intensity factor ( K IC ), critical crack propagation energy release rate ( G IC ), tensile strength, and glass transition temperature ( T g ), respectively. In addition, the dielectric constant and dielectric loss were reduced by 41.3% and 51.6%, respectively. Moreover, the flame retardancy of the epoxy thermosets was also improved with the addition of HBPSER. This comprehensive modification performance was caused by the synergistic effects of intramolecular cavities, rigid phenyl units, and flexible siloxane segments in HBPSER.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 9
·e70304
·
IF 3.4
Yong Liu,Jiaming Guo,Zongwei Guo,Lei Shang,Yuhui Ao
The thermal oxidation stabilization process of polyacrylonitrile (PAN) is a violent exothermic reaction process, which is not conducive to the improvement of carbon fiber quality. The highly exothermic reaction was often alleviated by adding unsaturated vinyl carboxylic acid monomers. In this investigation, poly(acrylonitrile-co-2-carboxyethyl acrylate) P(AN-co-CEA) copolymers with varying contents of CEA monomers were synthesized. The effects of CEA on the thermal behavior and structural evolution of copolymers were systematically investigated by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermal gravimetric analyzer (TGA). The results indicated that the introduction of CEA facilitated the cyclization reaction at lower temperatures through the ionic mechanism of the carboxyl group, broadened the exothermic peak, and reduced the heat release rate (Δ H /Δ T ). The activation energies (E a ) decreased from 157.7 KJ/mol for PAN homopolymer to 122.3 KJ/mol for P(AN-co-CEA) copolymer. Moreover, the CEA monomer promoted both the cyclization and dehydrogenation reactions, forming more stable cyclic structures and inhibiting the thermal decomposition of random chain segments. Consequently, higher carbon yield and a greater extent of stabilization (Es) were achieved. Additionally, the combined action of CEA and O 2 jointly enhanced the thermal oxidation stability process, resulting in the formation of oxygen-containing structures and promoting the transition to a graphite-like carbon network. Among the copolymers studied, the composition containing 2 wt% CEA exhibited the most favorable balance in the development of a well-stabilized structure. It was found that the CEA comonomer has the ability to promote the thermal oxidation stabilization process, alleviate the highly exothermic reactions, and reduce the heat release rate. Hence, these findings suggest that P(AN-co-CEA) copolymers have the potential to become carbon fiber precursor materials.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 9
·e70357
·
IF 3.4
Mengqi Xie,Zhidong Liu,Yutong Liu,Dengyue Zuo,Jinghao Zhang,Guang Cui,Hui Cao,Maoyuan Li
The selective reflection mechanism fundamentally limits the ability of cholesteric liquid crystals (CLCs) to achieve broadband high-reflectivity properties. This study proposes an innovative high-reflectivity CLC film based on the washing out/refilling strategy, where the polymerizable chiral dopant HCM006 is covalently anchored within the polymer network to stabilize its structure. Initially, a right-handed polymer network (RH-CLC) was engineered through UV polymerization, followed by the washing out of non-crosslinked components and the subsequent infiltration of a left-handed cholesteric system (LH-CLC) doped with S5011. Secondary polymerization facilitated spectral overlap between the reproduced reflective band of the polymer network and the broadband reflection of the refilled system, forming an extended high-reflectivity band. By optimizing the component ratios and polymerization conditions of the RH-CLC/LH-CLC systems, the reflection bandwidth was significantly broadened. Polarized light microscopy and ultraviolet–visible-near-infrared spectrophotometry confirmed that the film maintained a well-aligned planar texture throughout the fabrication process while achieving high reflectivity. Furthermore, the regulation of the chiral dopant concentration gradient achieved broadband high-reflectivity properties in the infrared region, enabling effective infrared shielding. The enhanced near-infrared reflection effectively mitigates solar-induced internal heat accumulation, rendering this film advantageous for thermal management applications, such as energy-saving architectural coatings or adaptive smart windows.
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高影响因子
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