POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 26
·期 11
·1351-1355
·
IF 1.757
Deming Zeng,Jian Lv,Chun Wei,Chuanbai Yu
Sisal is a natural material and a potential additive to reinforce composites. In this paper, sisal fiber cellulose microcrystalline (SFCM) was obtained from sisal fiber, and SFCM/unsaturated polyester (SFCM/UPR) in-situ resins were prepared via in-situ polymerization. Moreover, SFCM/UPR composites were produced with methods of rolling and molding. Effect of SFCM on dynamic mechanical properties of composites was studied. It is demonstrated that SFCM could significantly improve the dynamic mechanical properties of composites; the effect is closely related with the amount of SFCM, its dispersion in UPR matrix, and interfacial interaction. When the content of SFCM was 3 wt%, at 50°C, the storage modulus of SFCM/UPR composite was 33.22% higher than that of pure UPR. In addition, the glass transition temperature (T g ) was shifted to a higher temperature by 7.5°C, and loss modulus was decreased by 16.24%. The equilibrium value of relaxation modulus at 120 min was 30.52% higher than that of pure UPR composite. Besides, the equilibrium value of creep strain at 120 min was decreased by 41.61% compared with pure UPR composite. Copyright © 2015 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCES IN POLYMER TECHNOLOGY
·
2014
·Vol. 34
·期 2
·
IF 2.147
Jian Lv,Deming Zeng,Chun Wei
In this paper, sisal fiber cellulose microcrystal (SFCM) was prepared by the sulfate pulping method, and sisal fiber cellulose microcrystal/unsaturated polyester (SFCM/UP) in situ resin was polymerized. Furthermore, the SFCM/UP composite was prepared by rolling and molding techniques. Effects of SFCM content on mechanical and wear properties of the UP composites were studied. Structure and properties of the in situ SFCM/UP resin and its composites were characterized by using Fourier transform infrared, polarized optical microscopy, thermogravimetric analysis, scanning electron microscopy, and other methods. The results showed that the addition of SFCM by in situ polymerization significantly improves the thermal stability of UP: The decomposition temperature ( T d5 ) of SFCM/UP in situ resin, at thermal weight loss of 5%, is increased by 16°C compared to that of the pure UP resin. On a condition that the SFCM content was 2%, the impact strength, flexural strength, and flexural modulus of SFCM/UP composites are higher than those of UP composites by 41.08%, 52.52%, and 32.31%, respectively. Moreover, the addition of SFCM significantly enhances the wear properties of unsaturated polyester composite at 200°C; the volume wear rate of SFCM/UP composite is lower than that of UP composites by 64%, indicating SFCM could significantly strengthen and toughen UP composites.
研究领域:
材料科学
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复合材料
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 6
·1127
·
IF 4.967
Lifei Feng,Ran Li,Han Yang,Shanwei Chen,Wenbin Yang
We report a method of reinforcing and toughening unsaturated polyester resin (UPR) with a kind of hyperbranched polyester (HBP-1). Polyethylene glycol with different molecular weight was used as the core molecule of the preparation reaction, and the reaction product of phthalic anhydride and glycerol was used as the branching unit. The esterification reaction of polycondensation occurred, and then the hydroxyl-terminated hyperbranched polyester was prepared. The reaction product of maleic anhydride and isooctanol was added to the prepared hydroxyl-terminated hyperbranched polyester for esterification reaction. Both ends of the hyperbranched polyester had unsaturated double bond to obtain the hyperbranched polyester (HBP-1). The effects of this treatment on the morphology, mechanical properties and thermal properties of the composites were studied in detail. The HBP-1 was investigated by Fourier Transform Infrared Spectroscopy (FT-IR). The HBP-1/UPR composites were investigated by Thermogravimetric Analysis (TGA), Dynamic Mechanical Analysis (DMA), mechanical properties analysis and Scanning Electron Microscope (SEM). The results showed that HBP-1 enhanced the thermostability and mechanical properties of UPR. However, DMA indicated that the addition of HBP-1 cannot effectively improve the thermodynamic properties of UPR due to the flexible chain in HBP-1 structure. The HBP-1 improves tensile strength, bending strength and impact strength compared to neat UPR.Keywords:hyperbranched polyester;unsaturated polyester resin;thermostability;mechanical properties;reinforcement
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 34
·50853
·
IF 3.125
Junzhi Ma,Dong Wang,Shaohai Fu
To improve flame-retardant properties of unsaturated polyester resin (UPR), two phosphorus-containing vinyl monomers with different chemical structures were synthesized to replace styrene molecules and then copolymerized with UPR oligomers to prepare flame-retardant phosphatized UPRs. Curing behavior of phosphatized UPRs was investigated by DSC non-isothermal curing curves, deducing the best curing conditions. Cone calorimeter results demonstrated the obvious reduction of heat release rate and smoke production rate by comparing phosphatized UPRs with flammable UPR. TG-IR-MS coupling technique was utilized to reveal thermal degradation and pyrolytic volatiles including aromatic compounds, hydrocarbons, CO, PO 4 ˙, and so forth, providing more information of smoke toxicity and the gas phase flame- retardant mechanism of phosphatized UPRs. Moreover, the yield, compactness and graphitic degree of char residues of phosphatized UPRs were increased, strengthening the barrier effect to inhibit the permeation of combustion heat and the effusion of pyrolytic volatiles in the condensed phase.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2016
·Vol. 26
·期 1
·81-89
·
IF 1.684
Wang Fang,Liu Li-zhu,Zhang Xiao-rui,Weng Ling
A new kind of water-soluble hyperbranched unsaturated polyester resin (HBUP) was prepared to enhance the rate of curing, to increase the adhesive strength and to decrease the dielectric constant of the water-soluble insulating impregnation coating comprising water-soluble unsaturated alkyd resin and amino resin. The HBUP was synthesized from pentaerythritol as the core molecule, which was then esterified with dimethylol propionic acid (DMPA). In addition, the terminal hydroxyl groups of HBUP were modified by acrylic acid and maleic anhydride. The hyperbranched structure and C=C double bonds of HBUP resin were investigated by Fourier transform infrared (FTIR) and nuclear magnetic resonance ( 13 C-NMR and 1 H-NMR) spectroscopies. The reaction rate of the water-soluble insulating impregnation coating was accelerated by addition of HBUP which was demonstrated by the surface drying test and differential scanning calorimetry (DSC). The electrical and mechanical properties of the water-soluble insulating impregnation coating were also studied. It was shown that the addition of HBUP resin could reduce the permittivity of the coating which was at its lowest level when the HBUP content was 5 wt%, whereas the breakdown voltage, volume resistivity and adhesive strength of the coating were improved.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Peng Zhao,Xiaojing Cui,Chizhou Wang,Xiaojie Shao,Hongyan Li,Ning Zhang,Xianglin Hou,Tiansheng Deng
Enormous challenges have been encountered in the degradation and recycling of unsaturated polyester resin (UPR) in water, primarily due to its water resistance. Herein, a novel, efficient and green catalytic system of methanesulfonic acid (MSA)/sodium laurylsulfonate (SLS) was proposed to aqueously degrade UPR under mild conditions (200°C). This method is considerably milder compared to other reported works based on aqueous hydrolysis (230°C-380°C). What's more, amphiphilic SLS as a phase transfer reagent enhanced the concentration of catalyst at the H 2 O-UPR interface, which facilitated the mass transfer between organic motifs with inorganic reagents and thus accelerated the reaction. The NMR and FT-IR characterizations indicated the ester bonds were cleaved via hydrolysis with H 2 O catalyzed by MSA, and high value-added products, i.e., copolymer of styrene and maleic anhydride (SMA) and phthalic acid (PA), were reclaimed by a simple separation process, with the yield of 86.77% and 84.37%, respectively. Furthermore, a viable mechanism for degradation was proposed through the degradation performance of the model compounds. This study provides a practical approach for the chemical degradation and conversion of other resins containing ester bonds.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Chuanhui Gao,Yiliang Gao,Sikai Wang,Yajie Dong,Yumin Wu,Yuetao Liu,Chuanxing Wang
Intelligent bio-based self-healing polymers are advanced and sustainable materials that are widely used in military, coatings and conductive materials. However, it is a challenging task to design unsaturated polyester materials with good stretching ability, efficient self-repair ability and sensitive sensing ability. In this paper, a class of bio-based unsaturated polyester is synthesized, and the functional self-repairing unsaturated polyester material is obtained through the control and design of its structure. Firstly, a flexible self-healing polyester crosslinking network (CPUBT-UPy) was prepared by introducing 2-urea-4[1H] pyrimidinone (UPy) into the unsaturated polyester chain through chain extension reaction and using polyethylene glycol (PEG) to regulate the structure and properties of unsaturated polyester. By adjusting the molar ratio of BDO and UPy, the elongation at break of the elastomer can reach 2020.94%, and the self-repair efficiency can reach 91.33%. After 5 repair cycles, the self-repair efficiency can still reach 79.01%. A flexible conductive material was prepared by the composite of CPUBT-UPy and 15% MWCNTs-NH2, and is further assembled into a universal flexible strain sensor, which showed excellent sensitivity to finger bending, speech and frowning. Finally, unsaturated polyesters also confer potential degradability on elastomers.
研究领域:
材料科学
·
智能材料
·
可持续材料
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 10
·45935
·
IF 1.86
Nigus Mesele Tsegay,Xiang-Yun Du,Kangzhe Ma,Qing Li,Cai-Feng Wang,Su Chen
Infrared laser-ignited horizontal frontal polymerization is applied for the synthesis of unsaturated polyester resin (UPER) by copolymerizing unsaturated polyester with styrene (St), methyl methacrylate (MMA), and 2-dimethylamino ethyl methacrylate (DMAEMA) monomers. Dependence of frontal velocity and temperature on the initiator and monomer concentration is discussed for St-based UPER. These resins have also been characterized by Fourier transform infrared, thermogravimetric analysis, and scanning electron microscopy. The results reveal St-based resins have superior crosslinked networks. Besides, the thermo-pH responsiveness behaviors of DMAEMA-based resins are demonstrated by swelling measurements under the conditions of different temperatures and pH values. Moreover, by introducing CdSe@ZnS quantum dots and CsPbBr 3 perovskites into St- and MMA-based resins, respectively, we realize the in situ generation of CdSe@ZnS-UPER and CsPbBr 3 -UPER composites with good fluorescence properties and fluorescent stability, which have potential application in optoelectronic devices such as light-emitting diode and perovskite solar cells. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45935.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Ming Gao,Teng Feng,Xiaoqian Zhang,Junfei Li,Ligang Tang,Donghua Liu,Xuan Zhou,Fengwen Yao
Solid superacid possesses high acidity and thermal stability, which can effectively improve the flame retardant properties of materials by promoting catalytic dehydration and charring. On the other hand, montmorillonite (MMT) has a good synergistic effect with the flame retardant due to its unique two-dimensional nanosheet structure. To combine both advantages to get high performance, in this study, a solid superacid structure was introduced into the MMT to obtain a montmorillonite solid superacid (Ti-MSS). Its structure, morphology, and acidity were characterized by XRD, EDS, TEM, and Hammett indicator method. This Ti-MSS was then combined with ammonium polyphosphate (APP) for the flame retardant treatment of unsaturated polyester resin (UPR). The results showed that when the UPR composite containing 0.1 wt% Ti-MSS and 9.9 wt% APP, its limiting oxygen index (LOI) value reached 28.9%, and UL-94 achieved a V-0 rating. CCT data showed that, compared with the APP/UPR composites, the peak heat release rate and total heat release were reduced by 8.99% and 12.47%, respectively. Moreover, smoke and gas release were also reduced after the addition of Ti-MSS. TG, SEM, XPS, and Raman data results showed that Ti-MSS promoted carbonization of the UPR to obtain more residual char and make it more continuous and denser. It was suggested that Ti-MSS had a good synergistic flame retardant effect with APP on UPR.
研究领域:
高分子材料科学
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阻燃材料
·
纳米复合材料
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热功能材料
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2013
·
IF 2.468
Chengguo Liu,Jun Li,Wen Lei,Yonghong Zhou
A highly functionalized castor oil product mainly composed of castor oil pentaerythritol glyceride maleates (COPERMA) was employed to fabricate a partial biobased unsaturated polyester resin (UPR) through blending it with petroleum-based UPR. The COPERMA product synthesized was characterized by FT-IR, 1 H NMR, and ESI-MS to determine its possible structure and its functionality. The 1 H NMR results showed that the maleate C C functionality of the COPERMA product was high (2.62). This highly functionalized product was then mixed with 35 wt% styrene before blending this mix with petroleum-derived UPR to prepare a new partial biobased UPR. Physical, thermal, and mechanical properties of the UPR/COPERMA resins were carefully studied. Physical properties data indicate that the resultant biobased resins are suitable for liquid molding process and had a less shrinkage than the neat UPR. Compared to the neat UPR, the cured UPR/COPERMA resins demonstrated comparable or even better thermal and mechanical properties when the content of COPERMA resin was up to 10 wt%. When the content of COPERMA resin increased to 20 wt%, the tensile strength and storage modulus at 35 °C decreased gradually, but not as much as reported in other oil/UPR systems, while other properties, such as crosslink density, glass transition temperature, tensile and flexural moduli, and impact strength, were still improved.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2018
·Vol. 40
·期 4
·1595-1601
·
IF 1.943
Ming-En Fei,Tianshun Xie,Wendi Liu,Renhui Qiu
Bamboo fibers (BFs)-reinforced unsaturated polyester (UPE) composites were prepared by hand lay-up compression molding. The UPE resins were modified with 2-acetoacetoxyethyl methacrylate (AAEM) and designed to improve the flexibility and toughness of the BFs–UPE composites. The results indicated that the toughness of the composites significantly increased as the AAEM usage increased. When compared with the untreated UPE composites, the composites obtained from AAEM modified UPE resins (with a 20:80 weight ratio of AAEM to UPE) had 21.7% higher impact strength. Dynamic mechanical analysis showed that incorporation of AAEM significantly increased the damping parameter and decreased glass transition temperature of the composites due to the introduction of flexible segments of AAEM into the UPE resins. Scanning electron microscopy images of the impact-fractured surfaces of the composites revealed that AAEM modification improved the interfacial adhesion between BFs and UPE matrices. The main mechanism for the increase in the toughness of the composites could be due to the increased ductility of the matrices. POLYM. COMPOS., 40:1595–1601, 2019. © 2018 Society of Plastics Engineers
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Jiayue Hu,Fei Xin,Jiaying Du,Kaixuan Feng,Yu Chen
Herein, a novel flame retardant, 2,2,4,4,6,6-[1-(9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide-1-di(4-aminophenyl)-1-methyl)]-cyclotriphosphazene, named DPHP, was synthesized and used to flame retard the unsaturated polyester resin (UPR). On the one hand, the phosphorus element in DPHP can interrupt the chain reaction by the P-containing free radicals generated during combustion in the gas phase, and the P-containing compounds generated can catalyze the matrix into char in the condensed phase, and make the generated char denser and more continuous than pristine UPR. On the other hand, the nitrogen element in DPHP can produce non-flammable gas during combustion, and dilute oxygen and combustible volatile products, so DPHP played a role in the gas and condensed phases, improving the fire safety of the UPR matrix. As a result, 10DPHP/UPR showed better flame retardancy with a limiting oxygen index of 29.6%, and the peak heat release rate (pHRR) and total heat release rate (THR) decreased by 63.86% and 30.65%. The flame-retardant mechanism of DPHP in UPR was analyzed and discussed.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）