JOURNAL OF APPLIED POLYMER SCIENCE
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2024
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IF 2.7
Yucheng Zi,Dong Chen,Guochen Wang,Yuhong Ma,Wantai Yang
A simple strategy is proposed to offer styrene (St) copolymer with intrinsic and catalyst-free upcycling capability by incorporating α -methylstyrene (AMS) units into the copolymer poly(AMS -co- St) (PAS). Compared to polystyrene (PS), the PAS is more susceptible to depolymerizing into St and AMS monomers with higher yields at relatively lower temperature. The yield of liquid chemicals of PAS-4 (26.1 mol% AMS) is up to 93 wt% at 380°C, whereas that PS as control is 78 wt%. The reclaimed liquid chemicals of PAS-4 contain 58.4 wt% St and 37.7 wt% AMS, while the chemicals of PS contain 81.8 wt% St and 4.1 wt% AMS. The introduction of AMS units in PAS leads to a reduction in the liquid chemicals other than St and AMS monomers. The blends of PS and PAMS do not demonstrate the synergistic effect regarding facilitating the PS depolymerization. In addition, the properties of the new PASs prepared with the reclaimed monomers are comparable with those of the virgin PASs. This work proves the concept that recycling efficiency could be boosted by incorporating liable structural units into the copolymer chains and demonstrates a closed-loop of PS up-cycling.
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
JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 134
·期 32
·45111
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IF 1.86
Yangcheng Lu,Xiaojing Liu,Guangsheng Luo
Compared with low molecular surfactants, poly(vinyl alcohol) (PVA) could afford latexes with particular tackiness as an important property for various applications. However, until now, except for some highly reactive monomers, most of monomers including styrene seldom use PVA as protective colloid in emulsion polymerization. In this work, we used oil-soluble initiator, 2,2′-azobisisobutyronitrile, to accelerate the copolymerization of styrene and divinyl benzene in PVA protected colloids and synthesize polystyrene (PS) latex within 50 min at 70 °C successfully. The reaction system could remain stable even at the monomer-to-water ratio as high as 1:4, and the polymerization in pseudo-micelles or latex particles was always dominant. The adjustment of the size of the PS latex in the range from 70 to 100 nm was facilely achieved by changing the polymerization temperature, the addition of PVA, or the monomer-to-water ratio. This method was also exploited to synthesize poly(styrene- co -methyl methacrylate) and poly(styrene- co -4-chlorostyrene) latexes, indicating prospects in applications with the advantages of high capacity and broad applicability. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45111.
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2020
·
IF 3.862
Faliang Luo,Juntao Ren,Chunyu Li,Yanming Hu,Guangyuan Zhou
A styrene derivative, 4-N,N-dimethylaminostyrene (MAS), serving as both catalyst and monomer was exploited in reversible complexation mediated polymerization (RCMP). Radical trap experiment and UV–vis spectroscopy analysis revealed that MAS as a catalyst could abstract iodine from iodine-containing compound to generate propagating radical species. Kinetic studies demonstrated that the polymerization of styrene in the presence of MAS proceeded in a “living”/controlled manner, affording polymers with controlled molecular weights and narrow molecular weight distributions. The livingness of the obtained polymer was confirmed by chain extension. Determined by water contact angle measurement, incorporation of MAS into the polymer led to the enhancement of surface energy. Moreover, using α,ω-bis(2-iodo-2-phenylacetoxy)-end functionalized cis -1,4-polyisoprene as a macroinitiator which was synthesized through cross-metathesis of cis -1,4-polyisoprene with cis -1, 4-bis(2-iodo-2-phenylacetoxy)-2-butene, the polymerization of styrene in the presence of MAS also exhibited typical features of “living”/controlled radical polymerization to yield polystyrene-block-polyisoprene-block-polystyrene.
研究领域:
高分子科学
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材料科学
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化学工程
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DOI
高影响因子
Soft Matter
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2025
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IF 2.8
Tongtong Zhang,Shuo Wang,Hongyu Liu,Xiaolong Yang,Fangming Zhu
A facile method has been developed to produce syndiotactic polystyrene (sPS) aerogels by only three steps of polymer dissolution, gel aging and freeze-drying without any solvent exchange, unlike typical methods for sPS aerogel preparation. Due to the high melting point of p-xylene (around 13 °C), p-xylene-based sPS gels are unexpectedly robust in allowing the formation of aerogels by direct p-xylene removal through sublimation, leading to a more efficient synthesis and better quality of aerogels with much stronger mechanical properties. Furthermore, without the interference of solvent exchange, it is more suitable to explore the influence of key parameters (sPS content and molecular weight in precursor gels) on the preparation of sPS aerogels. The content and molecular weight of sPS will affect the crystallinity and porosity of the sPS aerogels, which can further control the microstructure, mechanical properties, dielectric constant, and adsorption performance of the materials. The obtained low density sPS aerogels with 98.9% porosity exhibited a minimum dielectric constant of 1.02 at low frequencies and high adsorption capacity towards different organic solvents and common oil.
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
PubMed
高影响因子
ACS Applied Nano Materials
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2023
·
IF 5.9
Jieyu Huang,Qufu Wei,Min Zhao
Fiber-based strain sensors have become a vital part for wearable electronics owing to their lightweight, flexibility, and easy processing. A poly(styrene-butadiene-styrene) (SBS)/MXene composite and coaxial fiber-based strain sensors were produced through a continuous, facile, and scalable wet-spinning approach, which exhibited both high stretchability and sensitivity. Electromechanical properties displayed that SBS/MXene composite fibers showed extremely high sensitivity (1.63 × 104), low strain detection (0.5%), and outstanding durability and reliability, which laid a foundation for detecting human motion including subtle activities, such as breathing and wrist pulse, and large-scale activities, such as bending of limb joints. The strain-sensing performance was further investigated by SBS/MXene coaxial fibers with SBS/MXene as sheath and SBS as core, presenting high sensitivity (4.69 × 103) and repeatability. SBS/MXene composite and coaxial fiber sensors demonstrated the potential application in wearable electronics with human motion detection.
研究领域:
材料科学
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柔性电子
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可穿戴设备
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DOI
高影响因子
DYES AND PIGMENTS
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2012
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IF 3.126
Ying Chen,Wenchao Peng,Shaobin Wang,Fengbao Zhang,Guoliang Zhang,Xiaobin Fan
Gold nanoparticles supported on three metal oxides , TiO 2 , Al 2 O 3 and Fe 2 O 3 , were prepared by a modified precipitation-deposition method using urea as an additive. These catalysts were tested in chemoselective reduction of 4,4′-dinitrostilbene-2,2′-disulfonic acid to 4,4′-diaminostilbene-2,2′-disulfonic acid. Three reagents, hydrogen, carbon monoxide , and sodium formate, were employed as reductants . It was found that >94% of the nitrostilbene was transformed into the aminostilbene without the reduction of olefinic group. In addition, these catalysts exhibited stable performance after regeneration by calcination at 400 °C for 5 h. This clean approach provides a promising application for synthesis of amino substituted stilbene sulfonic acid on an industrial scale.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Kelong Ding,Ze-Nan Hu,Wenhui Zhang,Jiaxing Liang,Yiming Wang,Hong Li,Zejun Sun,Qionglin Liang,Hong-bin Sun
Chemoselective hydrogenation of nitrostyrene to aminostyrene still faces the trouble of low selectivity and poor activity. The bimetallic catalysts, which adjust the activity of noble metal nanoparticles through the doping of non-noble metals, are promising for selectively catalytic transfer hydrogenation (CTH). For another aspect, the hydrogen source also plays a vital role in selective CTH. Based on this, we prepared activity-inhibited bimetallic RhIn/ZIF-8 catalyst to study the catalytic performance towards different hydrogen sources (N 2 H 4 ·H 2 O, NaBH 4 , NH 3 ·BH 3 and H 2 ) and to explore the natural selectivity of these hydrogen sources. We found that the hydrazine hydrate was the most selective H-donor for the nitro group, while the H 2 had the highest natural selectivity to olefins . The H 2 produced from hydrazine hydrate is responsible for the formation of completely reduced products. The potential reduction by the intermediate imine did not occur to C C double bonds, this indicates controlling the decomposition of N 2 H 4 will enhance the selectivity of nitroarenes. Based on this, the reaction system with the catalyst bimetallic RhIn/ZIF-8 and N 2 H 4 ·H 2 O as the hydrogen source is established, which can fully reduce many nitrostyrenes with >98% selectivity to corresponding aminostyrenes.
研究领域:
催化化学
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材料科学
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有机合成
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产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 3
·584
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IF 3.426
Zixin Yu,Jie Wang,Peihua Li,Dachuan Ding,Xuan Zheng,Chuanqun Hu,Zhinan Gao,Tao Hu,Xinghou Gong,Chonggang Wu
A half-critical weight-average molecular weight (M¯w) (approximately 21,000 g mol−1), high-ion-content Zn-salt poly(styrene–ran–cinnamic-acid) (SCA–Zn) ionomer was successfully synthesized by styrene–cinnamic-acid (10.8 mol %) copolymerization followed by excess-ZnO melt neutralization. At 220 °C, the SCA–Zn’s viscosity was only approximately 1.5 magnitude orders higher than that of commercial polystyrene (PS) at 102s−1, and the PS/SCA–Zn (5–40 wt %) melt blends showed apparently fine, two-phased morphologies with blurred interfaces, of which the 95/5 and 90/10 demonstrated Han plots suggesting their near miscibility. These indicate that any PS–(SCA–Zn) processability mismatch was minimized by the SCA–Zn’s half-criticalM¯wdespite its dense ionic cross-links. Meanwhile, the SCA–Zn’s Vicat softening temperature (VST) was maximized by its cross-linking toward 153.1 °C, from that (97.7 °C) of PS, based on its half-criticalM¯wat which the ultimate glass-transition temperature was approximated. Below approximately 110 °C, the PS/SCA–Zn (0–20 wt %) were seemingly miscible when theirVSTincreased linearly yet slightly with the SCA–Zn fraction due to the dissolution of the SCA–Zn’s cross-links. Nevertheless, the 60/40 blend’sVSTsignificantly diverged positively from the linearity until 111.1 °C, revealing its phase-separated morphology that effectively enhanced the heat resistance by the highly cross-linked SCA–Zn. This work proposes a methodology of improving PS heat resistance by melt blending with its half-criticalM¯w, high-ion-content ionomer.Keywords:polystyrene;heat resistance;blending modification;poly(styrene–ran–cinnamic acid);ionomer
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
POLYMER INTERNATIONAL
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2024
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IF 2.9
Hui Li,Hao Wu,Chao Wang,Jing Zheng
Thermoplastic elastomers are rubber-like in their elasticity, plastic-like in their ease of processing and recyclable. Styrene–butadiene–styrene (SBS) block copolymer is the world's most consumed thermoplastic elastomer. However, because of the carbon–carbon double bonds in its molecular structure, SBS exhibits poor thermal oxidation stability, which significantly limits the service lifetime and reliability of SBS. Here, we dramatically improve the thermal oxidation stability of SBS by incorporating graphene (GE) into the layered structure of SBS, which is attributed to GE's capacity to function as a gas barrier and scavenge free radicals. Compared with pure SBS, the oxidation induction time of SBS/GE nanocomposites can be increased by up to 225 times. This thermoplastic elastomer has potential in applications related to medical supplies, sports equipment, home appliances and automated office equipment. © 2024 Society of Industrial Chemistry.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 14
·8194-8203
·
IF 10.733
Changhui Liu,Ze Xu,Yan Song,Peizhao Lv,Jiateng Zhao,Chenzhen Liu,Yutao Huo,Ben Xu,Chunyu Zhu,Zhonghao Rao
Solving the mismatch between the supply and demand of energy in energy storage techniques is critical. Here, we report a novel Lewis acid catalysis induced in situ phase change material (PCM) shape-stabilization strategy to fabricate hyper-crosslinked polystyrene (HCPS) encapsulated PCMs towards the goal of highly efficient thermal energy storage. A simultaneous cross-linking and encapsulation process, enabled by a powerful FeCl3 catalyzed cross linking reaction, results in a highly efficient encapsulation rate. Thermal conductivity of the PCMs was enhanced by converting the cross-linking catalyst FeCl3 to Fe3O4 using a simple alkali treatment, by which 17% to 55% thermal conductivity enhancement was achieved compared with pure paraffin. Notably, waste polystyrene (PS) foam was demonstrated to be capable of being used as a starting material to support PCM, opening up a new avenue to utilize waste PS foam.
研究领域:
能源材料
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2025
·
IF 7.3
Jianfeng Zhu,Junjie Huang,Jianhong Yang,Jun Cai,Guoxiang Li
Lacquer sap is a precious natural emulsion collected from lac tree, mainly used as a coating. In order to improve its performance and reduce its usage cost, styrene was mixed into raw lacquer sap for modification. Under an oxygen atmosphere, the copolymerization of styrene and urushiol was achieved through the catalysis of laccase contained in the raw lacquer sap. The copolymerization process was characterized by GPC and NMR. To maintain the fluidity of the copolymerized lacquer, styrene couldn't be completely polymerized. Excessive reaction time could lead to explosive polymerization. Thus, controlling reaction time was particularly important. The copolymerized lacquer had a shorter drying time than the raw lacquer sap. The results from NMR, FT-IR, pyrolysis GC–MS and UV–Vis spectra showed that styrene had successfully polymerized into the dry lacquer film. Due to the introduction of styrene, the color of the lacquer film changed from dark brown to light yellow, and its pencil hardness and flexibility were improved, reaching 5H and 2 mm, respectively, while maintaining its excellent resistance to organic solvents. In addition, the thermal stability of the lacquer film was improved as well.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Chaobo Jiang,Ce Wang,Shilong Zhang,Hongzhe Bi,Yida Wu,Jiafeng Wang,Yanling Zhu,Jianbin Qin,Yongsheng Zhao,Xuetao Shi,Guangcheng Zhang
It is fascinating to develop vitrimeric elastomers with excellent processability and improved physical properties through incorporating reversible covalent bonds into traditional thermoplastic elastomers . In this work, a poly(styrene-b-isoprene-b-styrene) (SIS) thermoplastic elastomer was selected as the base elastomer and converted into vitrimer through peroxide-induced crosslinking reaction with di-vinyl-terminated boronic ester crosslinker . Kissinger model predicts that the activation energy of vitrimer crosslinking process is slightly higher than that of chemical crosslinking process. The peroxide content was adjusted to tune the composition of permanent chemical crosslinks and dynamic chemical crosslinks. In this way, SIS vitrimer elastomer with tailored multiple network structure was successfully prepared. The stress relaxation behavior of all SIS-BE samples shows Arrhenius-type temperature-dependency and the bond-exchange activation energy (E a ) of SIS-D0.5-B5 sample was estimated as 44.14 kJ/mol. SIS vitrimer elastomer shows improved creep-resistance, comparative mechanical strength and elastic recovery in relative to crosslinked SIS elastomer while maintaining good reprocessbility and self-healing efficiency. Additionally, SIS vitrimeric elastomer shows an increased lap-shear strength from 0.53 MPa to 1.02 MPa with the increase of DCP content. Therefore, we have demonstrated the potential for industrial-scale production of SIS vitrimer elastomer and its applications as reprocessable and healable adhesives.
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
危险品化学品经营许可证（带存储）