ACS Omega
·
2022
·
IF 4.132
Zhenzeng Wu,John Tosin Aladejana,Shuqiong Liu,Xinhuai Gong,Xiaodong Alice Wang,Yongqun Xie
Unsaturated polyester resin (UPR) with good chemical resistance, excellent mechanical properties, and formaldehyde-free shows great potentials in the wood industry. In this study, the mechanical strength, thermostability, dynamic thermomechanical property, and interfacial bonding of bamboo particle boards (BPBs) made from UPR adhesives with toluene diisocyanate (TDI) as the coupling agent were explored. The results showed that covalent bonds were formed among TDI, bamboo particles, and UPR, which could significantly enhance the mechanical strength. The internal bonding strength, modulus of elasticity, and modulus of rupture of treated BPBs were 1.36, 3010, and 19.6 MPa with the increment of 1250, 514, and 833%, respectively, compared to the control samples. Also, the thickness swelling rate of the BPB was 4.6%, much lower than that of the control, with a decrease of 92%. The thermostability of the treated BPB was also improved. As a result, the BPB using UPR as the adhesive and TDI as the coupling agent shows better usability, higher efficiency, and excellent mechanical strength.
研究领域:
材料科学
·
林业工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 5
·45562
·
IF 1.86
Dawei Xu,Dingcai Wu,Tongbai Yu,Ruowen Fu
A facile method is developed to synthesize silicone-toughened unsaturated polyester (SUP-M) by monomer copolymerization of anhydrides and diols with hydroxyl-terminated silicone. The structures and molecular weights of the SUP-M resins were characterized by Fourier transform infrared spectroscopy and gel permeation chromatography, respectively. The gelation time and mechanical properties, including impact strength, flexural strength, and tensile strength, were investigated. The fracture behaviors were studied by scanning electron microscopy, and their glass-transition temperature and storage modulus were measured by dynamic mechanical analysis. The experimental results showed that the impact strength of SUP-M can be obviously improved through copolymerization with a small amount of silicone without decreasing its mechanical properties. The impact strength, flexural strength, and tensile strength of SUP-M-0.5 are as high as 12.5 KJ m −2 , 131 MPa, and 59 MPa, which are increased by 76.1%, 21.2%, and 6.7%, respectively, compared with those of unsaturated polyester. Impacts on SUP-M with low silicone content produce a large number of evenly and regularly distributed continuous narrow crack bands combined with many evenly distributed branching crazes, which are of great benefit in absorbing a large amount of impact energy. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45562.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
Frontiers of Materials Science
·
2025
·Vol. 19
·期 2
·1-12
·
IF 2.3
Zhang Yan,Hu Yinchun,Chen Kexin,Jin Zhibin,Lei Qi,Li Yongcun,Cong Chuanbo,Zhou Qiong,Wang Yingying
The surface microstructure of continuous aramid fibers (AFs) is significant for AF/unsaturated polyester (UP) resin composites. The chemical modification of the AF surface is the key point to enhance mechanical properties of AF/UP composites. In this study, the polyethyleneimine (PEI)-polydopamine (PDA) coating was formed on the continuous AF surface via a one-step process. Morphologies and functional groups of PEI-PDA-coated AFs were studied. It was revealed that the interfacial bonding strength between PEI-PDA-AFs and the UP matrix was increased by 82.47% due to formation of the chemical bonding between amino groups on PEI and hydroxyl groups on UP. The tensile strength of the PEI-PDA-AF/UP composite reached 959.07 MPa, increased by 34.19% compared with that before modification. This study presents a simple and efficient method to prepare high-strength continuous AF/UP composites which could be used in engineering fields of deep-sea pipeline, aerospace, construction, military, safety, sports equipment, etc.
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Yuehong Zhang,Qinyang Lei,Shutong Zhang,Langlang Dai,Bin Lyu,Leipeng Liu
The development of low-carbon and environmentally friendly unsaturated polyester thermosets has attracted widespread attention. In this work, methacrylated castor oil (MCO) and methacrylated isosorbide (MI) were prepared using renewable castor oil and isosorbide by a simple and mild method. Subsequently, a variety of sustainable unsaturated polyester materials (MCO-MI) were prepared by curing MCO resin with the reactive diluent MI in different ratios via free radical polymerization. The chemical structure, viscosity, biobased carbon content, and LD50 of MCO and MI were evaluated, and the mechanical properties, thermo-mechanical properties, solvent resistance, and life cycle assessment (LCA) of the cured MCO-MI thermosets were investigated. The results showed that MCO and MI exhibited low viscosity (746 and 4 mPa s), chemical toxicity, and high biobased carbon content (85.9 and 76.9%). When the mass ratio of MCO to MI was 40:60, the resulting MCO-MI thermosets had the optimum thermo-mechanical property with a Tg of 170.2 °C and a tensile strength of 35.6 MPa. In addition, the LCA results demonstrated that the MCO-MI thermosets had striking environmental benefits over traditional petroleum-based unsaturated polyester materials containing styrene. This work provides insight into the preparation of environmentally friendly and high-performance unsaturated polyester materials employing biobased building blocks.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
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2024
·
IF 12.7
Wenli An,Yan Zhang,Junyan Li,Shun Zhang,Chengfeng Shen,Xuehui Liu,Zhishan Su,Shimei Xu,Yu-Zhong Wang
As the most productive thermosetting polymer, unsaturated polyester resin (UPR) and its composies were difficult to be chemcycled due to the mass transfer barrier in dense network structure. High temperature/pressure and mechanical crushing were usually applied to improve the mass transfer during chemcycling processes, but at the sacrifice of reaction selectivity and fiber integrity. Here, a unique fragmentation effect of aprotic solvents was observed in UPR, which is a non-reactive solvation that has the potential to replace mechanical fragmentation and improve the recyclability of UPR and its composite materials. The solvation was found to be based on the hydrogen bond between the solvent and ester group of UPR through Hansen solubility parameters and molecular dynamics simulation. It was the intermolecular force between the polyester clusters of UPR that was destroyed, leading to the fragmentation of UPR into micron-sized powder. The fragmentation effect is also applicable to other ester-containing polymers and provides a simple, facile, and energy-efficient method for the chemcycling of thermosetting resins, as well as direct exfoliation of reinforced fillers.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Lin Chen,Dan Zhao,Xiu-Li Wang,Yu-Zhong Wang
Frequent fire accidents and increasing environmental/health issues call for more durable and safer firefighting strategy for polymeric materials. Widely used small-molecule flame retardants are limited for their damage to thermal/mechanical properties, poor durability, undesirable persistence, bio-accumulation and toxicity (PBT). Herein, a novel macromolecular flame retardant , arylamine-DOPO-bearing polyphosphoester (PPDSP) has been synthesized and added to the unsaturated polyester (UP). On the one hand, hydrogen bond between arylamine group of PPDSP and UP network enhances the interchain interaction and compatibility. On the other hand, the phosphoester and DOPO groups can generate high-oxidized phosphorus-containing acids at high temperature, which further catalyze the dehydration reaction of arylamine and UP matrix into dense char-layers and exert the synergistic charring effect. By integrating the hydrogen bond and synergistic charring effects into PPDSP macromolecule, the obtained UP/PPDSP resins exhibit excellent fire safety, flame-retardant durability, heat-resistance and impact strength. Compared with UP, the T g and T 5% of UP/PPDSP20 are increased by 11 °C and 20 °C, respectively. The LOI value reaches 27.3%, the UL-94 rating is V-0 and the peak heat release rate is reduced by 58%. Even after one year of normal storage or one week of water soaking, the original flame retardant performance is maintained. Hence, this macromolecular firefighting strategy provides an efficient, durable and green pathway for improving the fire safety of polymers.
研究领域:
材料科学
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防火安全工程
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产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
·
2023
·Vol. 20
·期 5
·1747-1758
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IF 2.3
Feng Caixing,Ma Haihong,Ren Fengmei,Zhou Zhengfa,Xu Weibing
In this paper, fully bio-based branched unsaturated polyester (BUPE) oligomers were synthesized by one-step solvent-free polycondensation using itaconic acid, isosorbide and glycerol as feedstocks. The branched structure was confirmed by Fourier-transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance spectroscopy ( 1 H NMR). The effect of the branched structure on the properties of BUPE UV curing coatings was investigated. The results showed that the introduction of a glycerol branched structure was favorable for UV curing. The BUPE UV curing coatings based on the glycerol branched structure showed higher gel content and crosslink density, which enhanced the hardness, solvent resistance and mechanical properties of the coatings. In addition, the BUPE UV curing coatings possessed extremely low surface roughness, excellent heat resistance and light transmission properties.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
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2024
·
IF 2.3
Xinrui Wu,Qiong Lan,Junlong Yao,Yalan Tian,Susu Li,Zhitian Deng
To synchronously strength and plasticize unsaturated polyester resin (UPR), maleic anhydride were directly added in the unsaturated polyester resin solution and form the styrene-maleic anhydride oligomer (SMAO) without initiation. The creating SMAO cross link with UPR by curing reaction, and the prepared UPR resin exhibit higher tensile, elongation, bending strength and higher impact strength simultaneously, 0.45, 0.36, 0.76 and 0.12 times than UPR matrix, SMAO-UPR exhibits obvious plastic fracture characteristics; The DSC result indicates that the curing degree of SMAO-UPR is 96.55% which is 1.45% lower than that of UPR; The TG result indicates that MA and St mainly form an alternating copolymer below 90°C. The SEM and DMA result indicates that SMAO improves the morphology and structure which shows plastic deformation of UPR, and there is a certain interface effect between SMAO and UPR. Compared with the traditional method of large molecular weight SMA modified UPR, this method of reinforcing UPR is better for mechanical property, easy to operate, inexpensive, and highly applicable in industrial production.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2017
·Vol. 24
·期 12
·5505-5514
·
IF 3.417
Fei Ming-En,Xie Tianshun,Liu Wendi,Chen Han,Qiu Renhui
The present study focused on the surface treatment of bamboo fibers (BFs) with a bifunctional monomer, 1,2-epoxy-4-vinylcyclohexane (EVC), in the presence of N, N -dimethylbenzylamine as the catalyst, which results in the grafting of the fibers with C=C bonds on the surface. The modified BFs carrying C=C bonds were used to prepare bamboo fibers reinforced unsaturated polyester (UPE) composites by hand lay-up compression molding. Hence, chemical connections between the modified-fibers and UPE resins were formed via the free-radical polymerization of the C=C bonds during the preparation of the BFs–UPE composites. XPS analysis proved that the EVC was covalently bonded onto BFs. XRD analysis revealed that EVC-grafting did not alter the crystal structure of the fibers, but slightly decreased their crystallinity degrees. SEM images indicated an markedly improved interfacial adhesion between BFs and UPE matrices after fiber modification, which significantly increased the tensile strength, flexural strength, flexural modulus, storage modulus, glass transition temperature, and water resistance of the resulting BFs–UPE composites.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 38
·49148
·
IF 2.52
Wei Gao,Yuan Yu,Tingting Chen,Qingwu Zhang,Zhongwei Chen,Zhiquan Chen,Juncheng Jiang
Three metal oxides (MOs) (Fe 2 O 3 , Sb 2 O 3 , Al 2 O 3 ) were incorporated into blends of unsaturated polyester resin (UPR)/ammonium polyphosphate (APP) composites with the aim of studying and comparing their synergistic effect on flame retardancy with APP. The UPR-APP/MOs composites were prepared, then the thermal stability and flame-retardant properties of the UPR composites were evaluated by thermogravimetric analysis (TGA), limiting oxygen index (LOI), vertical burning test (UL-94), and cone calorimetry test (CCT). Besides, residues after CCT were characterized by scanning electron microscopy and laser Raman spectroscopy. The LOI values of the UPR composites with 0.5 wt% MOs increased to around 40%. However, the CCT results indicated that the incorporation of Sb 2 O 3 brought an increase in the total heat release. Moreover, these three MOs had different effects on the process of thermal degradation of UPR composites from the TGA results. Based on the above results, Al 2 O 3 provided a best promotion on flame retardancy among three MOs.
研究领域:
材料科学
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高分子化学
·
消防安全工程
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 11
·3006-3012
·
IF 9.405
Wenli An,Xiong-Lei Wang,Yang Yang,Huaxiu Xu,Shimei Xu,Yu-Zhong Wang
With high dimensional stability, chemical resistance, and thermal stability, unsaturated polyester (UP) resins are indispensable for many applications, causing the ever-increasing generation of waste UP. However, the conventional chemical recycling of UP is usually carried out under harsh conditions to produce monomers or oligomers along with a complex separation process. Developing a facile and easy approach is highly desired to explore the inherent value of UP and transform it into high-value products. In this study, an efficient strategy was developed for the chemical recycling of UP with the synergistic catalysis of the binary alkali of diethylenetriamine and sodium hydroxide under mild conditions. Diethylenetriamine functions as both a reactive solvent and a catalyst. The presence of diethylenetriamine facilitates the degradation, while only hydrolysis is observed without amination. The compositions of the degraded products can be controllably adjusted by varying the amount of binary alkali. Moreover, the main products can be easily separated from the reaction system by simple filtration. The ester bonds in the UP are selectively cleaved, producing large amounts of active groups such as hydroxyl, sodium carboxylate, ammonium carboxylate and amino groups. A novel gel material can be obtained and it demonstrates a fast adsorption performance and large adsorption capacity for cationic dyes and heavy metal ions.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
ZengHui Dai,ZeWen Yang,ZhiWei Chen,ZhongXiang Zhao,YongJian Lou,YanYan Zhang,TianXing Liu,FeiYa Fu,YaQin Fu,XiangDong Liu
In this study, a fully biobased composite reinforced by cotton fabrics was successfully fabricated by copolymerizing a bioderived unsaturated polyester (PEOI) with a green diluent, dimethyl itaconate (DI). The PEOI prepolymer was synthesized from itaconic acid (IA), oxalic acid (OA), and ethylene glycol (EG) via a simple polycondensation process and was characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), and viscosity measurements. Subsequently, the prepolymer was dissolved in DI to prepare a polymerizable unsaturated polyester resin (UPE) with low viscosity, excellent reactivity for free radical polymerization, and good compatibility with cotton fibers. After being reinforced by cotton fabrics, the resulting composites showed satisfactory material performance, including a strong tensile strength at break of approximately 34 MPa, a glass transition temperature (Tg) of approximately 108 °C, and thermal decomposition temperatures (Td5%) ranging from 224 to 276 °C. These green composites derived from renewable resources are hopeful candidates for replacing petroleum-based UPE resins, and the family of IA derivatives may play promising roles in fabricating fully biobased composites.
研究领域:
材料科学
·
生物化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）