JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
·
2023
·
IF 3.3
Lu Xu,Qianyi Tang,Yiwei Hu,Baijun Liu,Mingyao Zhang
Submicron polybutadiene particles were prepared using four different methods: one-step batch emulsion polymerization, pressure agglomeration, acid agglomeration, and polymer latex agglomeration. Core-shell elastomers were synthesized by grafting styrene and methyl methacrylate on polybutadiene particles. Transparent methacrylate-acrylonitrile-butadiene-styrene resin was prepared by blending the elastomers with methacrylate-styrene-acrylonitrile matrix resin synthesized by bulk polymerization. The effects of the construction method of submicron rubber particles on core-shell elastomer structure and composite properties were investigated. Additionally, the relationship between the rubber phase structure and composite properties was studied. The obtained results showed that the construction method significantly affected the size distribution and morphology of the submicron rubber particles. The rubber particles prepared by one-step batch emulsion polymerization were grafted easily, with 90.2% grafting efficiency of the corresponding core-shell elastomer. The grafting efficiency of the rubber particles prepared by acid agglomeration was only 69.4%. The former was most suitable as the toughening core of transparent Acrylonitrile-butadiene-styrene resin, and the transmittance and haze values of the composite were 90% and 2.4, respectively. Impact and tensile strengths were 185.6 J/m and 39 MPa, respectively. The acid agglomeration method generated submicron rubber particles more quickly, and the transmittance and haze of composite were 90% and 2.9, respectively. However, the impact and tensile strengths were reduced to 170.4 J/m and 31 MPa, respectively.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2022
·Vol. 43
·期 11
·8228-8238
·
IF 3.531
Zhongying Wang,Huan Wang,Xiaomei Shen,Qingfu Wang,Zhiqian Wang,Fanghui Wang,Hong Zhu
In this work, a series of C 3 N 4 /SiO 2 nanohybrids were prepared and incorporated to solution polymerized styrene-butadiene rubber/butadiene rubber (SSBR/BR) to prepare “green tire” tread rubber. As expected, C 3 N 4 /SiO 2 nanohybrids are uniformly dispersed in SSBR/BR, and SiO 2 possesses a small average particle size of ~15 nm. In addition, the interfacial interaction between C 3 N 4 /SiO 2 nanohybrids and rubber matrix are significantly enhanced. Hence, the mechanical properties of C 3 N 4 /SiO 2 -SSBR/BR nanocomposites are greatly improved. The tensile strength of 5% C 3 N 4 /SiO 2 -SSBR/BR nanocomposites (5 wt% C 3 N 4 in C 3 N 4 /SiO 2 ) improved 1580% compared to pristine SSBR/BR. Furthermore, dynamic mechanical analyses indicate the increasing wet skid resistance (10.8% higher) and decreasing rolling resistance (50.5% lower) of 5% C 3 N 4 /SiO 2 -SSBR/BR nanocomposites compared with SiO 2 -SSBR/BR. In addition, the wear volume and heat built-up are reduced at the same time. This work paves the way to prepare high comprehensive performance “green tire” and could be extend to the reinforcement of elastomer composites.
研究领域:
材料科学
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高分子化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2020
·Vol. 5
·期 9
·1833-1844
·
IF 3.441
Guochao Yang,Lingtao Wang,Haoxi Jiang
Upgrading bio-ethanol into high value chemicals is an important issue in biomass conversion, and conversion of ethanol into butadiene is one of the most feasible methods. Here Zr-incorporating mesoporous SBA-15 (Zr–SBA-15) materials with different Si/Zr ratios were successfully synthesized by a one-pot method and were employed as catalysts for the conversion of the ethanol (EtOH)–acetaldehyde (AcH) mixture to butadiene. The textural structure and acidity of Zr–SBA-15 were investigated by using XRD, N2 adsorption, TEM, FT-IR, UV-vis, XPS, NH3-TPD and Py-IR, and the results of these characterizations indicated the mesoporosity of Zr–SBA-15 and confirmed the incorporation of Zr into the framework. Zr–O–Si bonds were formed by the incorporation and exhibited Lewis acidity predominantly. The influence of the Si/Zr ratio and reaction conditions (temperature, EtOH/AcH ratio and WHSV) showed that a suitable Si/Zr ratio was needed to balance the butadiene selectivity, by-product selectivity and total conversion. Amongst the prepared catalysts, Zr–SBA-15-20 achieved the best butadiene selectivity of 74.0% at a relatively low temperature (275 °C). The good catalytic performance could be attributed to the homogeneous dispersion of Zr species and Zr–O–Si bond generated by Zr incorporation. Furthermore, EtOH-TPD and AcH-TPD experiments proved the essential role of acetaldehyde addition and the well-accepted reaction pathway.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Fuchong Li,Yang Gao,Chen Yu,Hailong Yang,Gai Guo Liu,Wei Cao,Jinshan Guo
The traditional batch synthesis of liquid rubber faces issues such as low monomer polymerization concentration, poor uniformity of the reaction system, and inadequate heat dissipation, resulting in an unsatisfactory synthesis efficiency. This study presents a method for the rapid and efficient synthesis of high vinyl 1,2-polybutadiene liquid rubber using butadiene as the monomer and n -butyllithium as the initiator. By applying continuous flow microchannel reactors, the limitation of traditional synthesis method can be overcome. The addition of a modifier in the raw material promotes the formation of high vinyl structure. The preparation of liquid rubber requires the addition of a large amount of metal lithium initiator. However, for aerospace sealants, there is a requirement for low metal ion content. To address this, we employed different methods to reduce the metal ion content in the liquid rubber and increase its purity. Ultimately, we achieved the synthesis of high-purity polybutadiene liquid rubber with 1,2-vinyl content exceeding 88%, narrow molecular weight distribution, and tunable molecular weights. This research will provide technical guidance for the industrial application of polybutadiene synthesis in continuous flow microchannel reactors.
研究领域:
化学工程
·
高分子科学
·
材料科学
✓ 已验证
DOI
高影响因子
Micro & Nano Letters
·
2018
·Vol. 13
·期 10
·1486-1490
·
IF 0.841
Jianwu Sun,Yiming Jiang,Xiaoteng Zhou,Bo Ning,He Qin,Chengyou Kan
In order to meet the requirement of impact modifier, the agglomerated butadiene-styrene rubber (a-SBR) latexes were first prepared by bubbling CO 2 into original butadiene-styrene rubber latex with the diameter about 100 nm, and then the poly(methyl methacrylate-butadiene-styrene) latexes (a-MBS) with a wide particle size distribution were fabricated via seeded emulsion copolymerisation of styrene and methyl methacrylate onto the a-SBR seeds. It was found that the pH value of the system decreased slowly with the time of CO 2 bubbling, while a-SBR particles were not enlarged until the pH value reduced to about 8. In particular, when the pH value decreased to around 7, the size of a-SBR particles enlarged dramatically and the agglomerated system should be adjusted immediately to alkaline condition with NaOH aqueous solution. Transmission electron microscopy observation indicated that the a-MBS particles with a wide size distribution were successfully prepared. Moreover, both the shell thickness and grafting efficiency of the MBS particles decreased gradually with the increasing SBR particle size, while the rubber volume fraction of MBS particles increased. The whole process of agglomeration and grafting copolymerisation is mild, efficient and has great potential in the industrial application.
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
ACS Sustainable Chemistry & Engineering
·
2016
·
IF 5.267
Qiangqiang Zhu,Bin Wang,Tianwei Tan
For the effect of structural features on the catalytic performance of the conversion of ethanol and acetaldehyde to butadiene to be investigated, a series of MgO–SiO2 catalysts with different structural properties were synthesized by tuning the calcination temperature, investigated, and characterized. The best butadiene selectivity of 80.7% appears for the MgO–SiO2 catalyst calcined at 500 °C using a mixture of acetaldehyde/ethanol/water (22.5:67.5:10 wt %) as feed. Addition of the appropriate amount of water (10 wt %) improved butadiene selectivity by inhibiting the formation of 1-butanol and C6 compounds. Results from XRD, FT-IR, and 29Si MAS NMR indicate the generation of a significant amount of amorphous magnesium silicates along with few crystalline magnesium silicates for the catalyst calcined at 500 °C. XPS results indicate that it contains the lowest binding energies of both Si–O and Mg–O from Si–O–Mg bonds. For the catalysts calcined at low temperature (350 and 400 °C), more 1-butanol and C6 compounds formed, which are considered to be related to residual Mg(NO3)2. Additionally, more ethylene, diethyl ether, and butylene isomers were produced over the MgO–SiO2 catalyst calcined at 700 °C with the formation of forsterite Mg2SiO4. Further results from Fourier transform infrared spectroscopy after pyridine adsorption and CO2 temperature-programmed desorption show that the high catalytic performance is related to the presence of Lewis acidic sites and an intermediate number of basic sites.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS SURVEYS FROM ASIA
·
2020
·Vol. 24
·期 2
·115-122
·
IF 2.194
Gao Meixiang,Jiang Haoxi,Zhang Minhua
This paper has systematically investigated the structures and properties of the ZrO 2 , Nano-SiO 2 and their composition. The catalysts were prepared by impregnation, characterized by N 2 adsorption–desorption, TEM, XRD, Raman, temperature-programmed desorption of NH 3 and CO 2 , FTIR spectroscopy of adsorbed pyridine and CO 2 , and UV–vis spectra. Compared with dry-mixed samples, these catalysts have larger average pore diameter, enabling ZrO 2 to be dispersed more uniformly on the surface of Nano-SiO 2 . With the Zr–O–Si bonds, ZrO 2 could interact intensely with Nano-SiO 2 . The catalyst prepared shows the best performance, with the selectivity of 93.18% and conversion of 58.52%. The preparation methods have a significant influence on the interaction between ZrO 2 and Nano-SiO 2, which then affects the acid–basic properties. This paper finds that weak acid–basic sites with moderate-intensity are more suitable for ethanol conversion to BD, with the amount of acid and basic sites as close as possible.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·Vol. 44
·期 10
·2200971
·
IF 4.6
Jie Mao,Jing Li,Wang Lin,Faliang Luo
This work describes an easy and effective process for preparing a homogeneous polybutadiene (PB) dielectric elastomer with improved actuated strain by utilizing a photochemical thiol-ene click reaction. The carboxyl groups and various ester groups are used for grafting on the PB. Since the length of the alkyl chains of the ester groups will significantly influence the polarities of the carbonyl groups and hydrogen bonding effect, the influence of polarity and hydrogen bonding effect on the dielectric properties and mechanical properties of the modified polybutadienes is carefully discussed. Very interestingly, it is found that the increment of dielectric constant of PB modified by carboxyl groups is the lowest one compared to other modified PBs with the ester groups. Meanwhile, the modified PBs with the ester groups could achieve pretty low dielectric loss factor, and finally, a high dielectric constant (3.6), low dielectric loss factor (0.0005), and large actuated strain (≈25%) of the modified polybutadienes could be achieved by the modified PBs with butyl acrylate groups. This work provides a simple and effective method for the designing and synthesizing of a homogeneous high electromechanical performance dielectric elastomer with high dielectric constant and low dielectric loss.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 2
·684
·
IF 3.4
Yunxin Yang,Cong Wang,Hua Zhang,Jiancai Qian,Song Yang,Huiyun Liao,Xuehui Sun,Yipeng Wang,Peijian Sun,Yunzhen Jia,Junwei Guo,Huaiyuan Zhu,Cong Nie
Removal of 1,3-butadiene from cigarette smoke plays an important role in human health and environmental protection. Herein, a series of UiO-66 X% containing different ratios of the -NH2group was synthesized via the solvothermal method by using terephthalic acid (H2BDC) and 2-aminoterephthalic acid (NH2-BDC) as ligands. Using GO as support, a series of UiO-66-NH2/GO Y% were prepared by controlling the ratio of UiO-66-NH2and GO. The effects of -NH2and GO contents on the structure and composition of MOFs were investigated. Finally, the different -NH2contents of UiO-66 X% and the different GO contents of UiO-66-NH2/GO Y% were applied in 1,3-butadiene removal from cigarette smoke. The results showed that UiO-66 X% with the higher contents of -NH2showed a higher rate of 1,3-butadiene removal, and UiO-66-NH2/GO Y% with the GO contents of 5% showed the highest removal rate of about 33.85%, which was 25.54% higher than that of activated carbon. In addition, the saturation capacity of the adsorbent materials for 1,3-butadiene was as high as 210.01–239.54 mg/g, showing great potential in reducing harmful components in cigarette smoke and environmental protection.Keywords:UiO-66;UiO-66-NH2/GO;1,3-butadiene removal;cigarette smoke
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2025
·
IF 2.3
Zuo Hongmei,Du Yuting,Zhou Zihao,Xu Yaning,Shi Jie,Zou Lihua,Xie Yanxia
In order to develop elastomer composite with high thermal conductivity based on polyester (PET) fabric and further prolong the service life and improve service safety, modified PET fabric was prepared. Initially, different content of carbon black was added into butadiene latex and phenolic resin to prepare complex emulsion. Then, the emulsion was coated on the fabric by dipping and rolling technique. The results showed that carbon black possessed excellent stability and could be dispersed in butadiene latex uniformly. Meanwhile, the viscosity of the complex emulsion was low. The absolute value of zeta potential exhibited that carbon black could promote the reaction of complex emulsion. In addition, the tensile properties and thermal conductivity were both improved after adding carbon black. When adding 5.3 wt% carbon black, the tensile strength of carbon black modified emulsion film could reach 6.57 MPa and the thermal conductivity could reach 3.16W/(m∙K). As a result, the thermal conductivity of 5.3 wt% carbon black modified emulsion-coated PET composite reached 3.43 W/(m∙K), which was 38.31% higher than that of pure emulsion modified PET composite. The results showed that carbon black was an excellent and low-cost nano-filler, which could be used to improve the thermal conductivity of PET-related elastomer composite.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-16
·
IF 3.8
Lu Jiaxin,Chen Chong,Zhang Bobo,Niu Kang,Xiao Fei,Liang Taixin
Boric acid and other impurities on the surface of boron (B) particles can interact with hydroxyl-terminated polybutadiene (HTPB), weakening the mechanical properties and energy release efficiency of boron-based solid rocket propellants. SA@B composite particles were created by coating stearic acid (SA) on the surface of B particles through solvent evaporation-induced self-assembly. The study investigated the impact of SA coating on the combustion performance of B particles and the mechanical properties of HTPB matrix composites. The results showed that the SA coating enhanced the oxidation efficiency of B particles in air. The combustion heat of SA@B composite particles is 30.29 MJ/g, about 50% higher than that of B particles. During the combustion of SA@B composite particles, fewer molten solid particles surround the flame, which enhances the stability of the combustion process of the B particles. Furthermore, the SA coating effectively enhanced the dispersion of B particles in HTPB. At a stretching speed of 100 mm/min, the tensile strength of the SA@B/HTPB composite materials is higher than that of the B/HTPB composite materials. Moreover, when the mass loading of the SA@B composite particles reaches 50 wt%, the tensile strength of SA@B/HTPB composite materials is 2.46 MPa. Activating the surface of boron particles with SA can significantly improve their compatibility with HTPB, which is crucial for the stable storage of boron-based solid rocket propellants.
研究领域:
材料科学
·
燃烧学
·
推进剂工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Long Han,Mengmeng Xu,Hairui Wang,Hongyu Zhang,Jing Hua,Chengzhong Zong
The loading of antioxidants onto inorganic fillers is a vital method for preventing the migration of rubber antioxidants. However, the loading rate is not ideal, which has been a persistent problem for scholars in this field. In this work, the mussel-based strategy was used to coat titanium carbide (Ti 3 C 2 ) surfaces with polydopamine (PDA). The amino group on the antioxidant 4-aminodiphenylamine (RT) is opened with the epoxy group on the silane coupling agent KH560, while the phenol hydroxyl group of PDA condenses with the silanol group on KH560 to prepare titanium carbide-supported antioxidant molecules (Ti 3 C 2 -RT). The layered Ti 3 C 2 dispersed in the matrix material not only effectively prevents oxygen from entering, but also provides a large specific surface area for the supported antioxidant. At the same time, the introduction of high-functionality polyamines and silane coupling agents creates conditions for the preparation of inorganic fillers with high loading rates of antioxidants. The loading rate of Ti 3 C 2 -RT was evaluated by TGA, and the mass fraction of antioxidant RT on Ti 3 C 2 -RT was approximately 16.5%, which means that it has the highest loading rate in the field of inorganic fillers loaded with antioxidants. In addition, the mechanical properties of polybutadiene rubber before and after aging were also studied. The test results show that the new antioxidant Ti 3 C 2 -RT has good anti-aging effect and can effectively prevent antioxidant precipitation. Therefore, compared to organic antioxidants, the supported antioxidant Ti 3 C 2 -RT has a longer ability to scavenge free radicals, resulting in a longer service life of rubber products.
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
危险品化学品经营许可证（带存储）