Simulation, design and synthesis of polybenzoxazine with different m<scp>ain‐chain</scp> structures and properties: A comparative study

Li, Xin Kang; Shen, Jun Wei; Lin, Hai; Zhang, Zhao Xin; Zhang, Xun Tao; Bian, Jun; Chen, Dai Qiang

doi:10.1002/app.53829

Cited by 8 publications

(12 citation statements)

References 46 publications

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“…In PBZ, the 2D structure of GO played a role in crack bridging and deflection to increase the energy consumed by fracture, thereby increasing the IS of PBZ composites within a certain range of GO content. However, excessive crosslinking density could let the matrix more brittle 21 . Continuous increases in GO content might cause agglomeration, reducing the high aspect ratio of GO and even forming defects in PBZ composites, leading to instantaneous stress concentration and fracture.…”

Section: Resultsmentioning

confidence: 99%

“…In our previous study, a novel main-chain PBZ containing unsaturated fatty chains has been obtained. 21 Higher heat resistance and toughness were achieved compared to traditional diamine PBZ, and lower viscosity was observed compared to general main-chain PBZ. Combining the toughening effect of unsaturated fatty chains with the excellent mechanical properties and heat resistance of the main-chain structure, the PBZ showed the potential to prepare high-performance PBZ composites.…”

Section: Introductionmentioning

confidence: 92%

“…However, excessive crosslinking density could let the matrix more brittle. 21 Continuous increases in GO content might cause agglomeration, reducing the high aspect ratio of GO and even forming defects in PBZ composites, leading to instantaneous stress concentration and fracture. This was the primary reason for the decrease in IS when the GO content exceeds a certain threshold.…”

Section: Mechanical Properties Of Pbz and Pbz Compositesmentioning

confidence: 99%

“…Our previous work has verified the obtained neat PBZ matrix showed better heat resistance than the other existing literature. 21,40 This was largely due to the more complete crosslinking network formed by the main chain structure of the BZ oligomers after crosslinking. The addition of GO and its derivatives increased the charring yield of the composites, as observed in TGA.…”

Section: Thermal Properties Of Pbz Compositesmentioning

confidence: 99%

“…In our previous study, a novel main‐chain PBZ containing unsaturated fatty chains has been obtained 21 . Higher heat resistance and toughness were achieved compared to traditional diamine PBZ, and lower viscosity was observed compared to general main‐chain PBZ.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical properties, thermal stability, and mechanism of main‐chain polybenzoxazine composites fabricated based on multi‐scale effects and surface functionalization of graphene oxide nanosheets

Li,

Jiang,

Wei

et al. 2023

Polymer Composites

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Polybenzoxazine (PBZ) has been recognized as a potential substitute for traditional phenolic resin. However, poor flexibility and low heat resistance limited obviously the application of PBZ. Herein, graphene oxide (GO) nanosheet and its amino‐rich derivatives (fGO‐g‐SiO2) with multi‐scale surfaces were designed, synthesized and incorporated into main‐chain PBZ through in‐situ polymerization to fabricate PBZ composites. The morphology, mechanical properties, and thermal stability of the composites were systematically investigated using x‐ray diffraction (XRD), contact angle tests, field emission scanning electron microscopy (FESEM), tensile and impact tests, and thermogravimetric analysis (TGA). FTIR and XRD analyses confirmed the multi‐scale surfaces of GO derivatives and ordered structures, respectively. The size of the in‐situ grown SiO2 and the thickness of GO coated on PBZ were estimated as 6.5 and 19.07 nm, respectively. The contact angle test revealed that fGO‐g‐SiO2 and BZ had the closest solid surface energy of 32.002 and 43.519 mN/m, respectively, among the components of the composites. The impact and tensile evaluation revealed the highest impact, tensile strength and Young's modulus of 16.75 kJ/m2, 107.24 MPa and 3.17 GPa, respectively for 1.2% fGO‐g‐SiO2/PBZ composite. The modified Halpin‐Tsai equation was also utilized to develop a predictive function for the tensile strength. FESEM of fGO‐g‐SiO2/PBZ composites indicated that the multi‐scale effect and amination effectively improved the restriction of GO derivatives on crack propagation in PBZ composites and played a more significant role in crack deflection and bridging. In addition, the highest thermal decomposition activation energy of 166.94 kJ/mol was achieved for 1.2% fGO‐g‐SiO2/PBZ composite.Highlights Graphene oxide (GO) nanosheets were incorporated into main‐chain polybenzoxazine (PBZ) to improve its mechanical properties and heat resistance. GO with multi‐scale structure and amino‐rich interface were designed, synthesized to improve the interface interactions with PBZ matrix. The GO with multi‐scale structure and amino‐rich interface showed excellent similarity in the term of solid surface energy with benzoxazine oligomers. The morphology, mechanical and thermal stability of resulting PBZ composites was systematically investigated by using experimental and mathematical model to elucidate the relationships between the structure and properties. The composites exhibited excellent mechanical and thermal properties, and it is expected to be used as advanced engineering material in demanding environments.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Section: Mechanical Properties Of Pbz and Pbz Compositesmentioning

confidence: 99%

Section: Thermal Properties Of Pbz Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical properties, thermal stability, and mechanism of main‐chain polybenzoxazine composites fabricated based on multi‐scale effects and surface functionalization of graphene oxide nanosheets

Li,

Jiang,

Wei

et al. 2023

Polymer Composites

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Investigation of water absorption performance of polyester‐woven fabrics coated with super absorbent polymer

Özan,

Kanik,

Özer

2023

J of Applied Polymer Sci

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Superabsorbent polymers (SAPs) constitute a special class of polymers widely used in various fields, especially in the hygiene and healthcare sectors. This study investigates the feasibility of achieving high water absorption capacity surfaces by coating powdered SAP using conventional coating methods onto textile surfaces. For this purpose, water‐based coating pastes containing micronized SAP powder based on acrylamide/acrylic acid copolymer were coated onto polyester (PES)‐woven fabric surfaces using a knife‐over‐roll coating technique. As the working parameters, the pH value of the coating paste, the coating thickness (the distance between the cloth and the knife), the drying/fixing temperature and time, the SAP concentration, and the water absorption capacity according to time were investigated. The results were evaluated by applying the coating thickness, the amount of coating material transferred to the fabric on the SAP‐coated samples, water absorbing capacity, and centrifugal water retention tests. The obtained results have demonstrated that textile surfaces with high water absorption capacity (on average 200%–350%) can be achieved by coating hydrophobic fabric surfaces, such as PES, with SAP under suitable conditions.

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Design, Synthesis, and Evaluation of Benzoxazine Copolymers for Anti‐Corrosion Coating Applications Based on Improved High Crosslinking Density and Hydrophobicity

Zhang,

Zhao,

et al. 2024

J of Applied Polymer Sci

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The main‐chain benzoxazine (BA‐ddm) and diamine‐type benzoxazine (Ph‐hda) were prepared by solution method, and a series of copolymers were prepared by mixing them at various mass ratios. Second, copolymer coatings (P(PB)) were prepared on the surface of the tinplate by dip coating and heat curing. The results of FTIR and 1HNMR showed that the benzoxazine copolymer coating was successfully prepared. DSC test results showed that the copolymerization of two benzoxazine oligomers was promoted by the introduction of BA‐ddm containing phenolic hydroxyl groups. The introduction of Ph‐hda containing a long aliphatic chain provided the copolymer coatings with good hydrophobicity, as verified by the hydrophilicity and hydrophobicity tests. When the mass ratio of BA‐ddm to Ph‐hda was 1:19, the water contact angle and water absorption of P(PB5) were 100.10% and 0.56%, respectively. The results of dynamic polarization curves and electrochemical impedance spectroscopy (EIS) indicated that different copolymer coatings had good corrosion resistance. Among them, the P(PB5) coating exhibited the best anti‐corrosion performance, with a corrosion current of 5.15 × 10−8 A cm−2, a protection efficiency of 99.23%, and an impedance modulus of 1.78 × 107 Ω cm2 at 0.01 Hz, which was nearly 5 orders of magnitude higher than the impedance modulus of the blank tinplate.

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Simulation, design and synthesis of polybenzoxazine with different main‐chain structures and properties: A comparative study

Cited by 8 publications

References 46 publications

Mechanical properties, thermal stability, and mechanism of main‐chain polybenzoxazine composites fabricated based on multi‐scale effects and surface functionalization of graphene oxide nanosheets

Mechanical properties, thermal stability, and mechanism of main‐chain polybenzoxazine composites fabricated based on multi‐scale effects and surface functionalization of graphene oxide nanosheets

Investigation of water absorption performance of polyester‐woven fabrics coated with super absorbent polymer

Design, Synthesis, and Evaluation of Benzoxazine Copolymers for Anti‐Corrosion Coating Applications Based on Improved High Crosslinking Density and Hydrophobicity

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