POLYMER DEGRADATION AND STABILITY
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2026
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IF 8.1
Guangxin Chu,Yifu Zhang,Bo Yuan,Zeyu Zheng,Jingwen Xu,Zilong Zhang,Shengping Yi,Jun Liao,Chi Huang
Conventional base catalysts such as KOH often suffer from low yields and multiple side reactions in the degradation of polydimethylsiloxane (PDMS) to produce high-value dimethyl cyclosiloxane (DMC). To overcome these limitations, a novel supramolecular catalyst-[K(cryptand[2.2.2])]F-was designed and synthesized in this work by utilizing the coordination interaction between KF and cryptand[2.2.2]. In this structure, K⁺ forms a stable coordination bond with the cryptand, which effectively weakens the electrostatic interactions within KF, thereby significantly promoting the dissociation and nucleophilic reactivity of F⁻ in the organic phase and resulting in a highly efficient supramolecular catalytic system. The use of a DMSO/n-octadecyl alcohol mixed solvent not only facilitated a homogeneous reaction between PDMS and the catalyst but also reduced the solvation effect on F⁻, further enhancing its catalytic performance. Experimental results show that with only 1% [K(cryptand[2.2.2])]F loading, the cyclic monomer yield from PDMS cleavage reached 95%, with DMC selectivity exceeding 99.5%. Moreover, the catalyst retained high activity over ten consecutive cycles, maintaining a yield above 93% and demonstrating excellent stability. Additionally, an improved Dean-Stark trap was used to construct a continuous production system capable of synthesizing DMC under low solvent-circulation conditions. This study presents a new and efficient catalytic strategy for the green and high-value upcycling of silicone waste, offering promising prospects for advancing a circular economy in the silicone industry.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
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IF 2.829
Zhou Zhou,Hao Wang,Zhicai Zhu,Hui Yang,Qilong Zhang
This paper reports a feasible method to prepare polymeric nanocomposites with enhanced dielectric, electromechanical and hydrophobic performance by introducing the core-shell AgNWs@SiO 2 filler into polydimethylsiloxane (PDMS). The homogenous core-shell AgNWs@SiO 2 was firstly synthesized through a two-step sol-gel process. The thicknesses of AgNWs and SiO 2 coating layer are approximately 70 nm and 20 nm, respectively. The dielectric constant is improved effectively due to enhanced interfacial polarization, while extremely low dielectric loss and conductivity are achieved by introducing the insulating SiO 2 interlayer to moderate the internal surface area of core-shell nanowires and restrict the electron transfer between Ag nanowires. Typically, the PDMS nanocomposites with 20 wt% AgNWs@SiO 2 have a dielectric constant of 6.7, nearly 2.7 times larger than that of pure PDMS, and remains a quite low loss of 0.02 at 1 kHz. Meanwhile, nanocomposites also show improved electromechanical and hydrophoic properties. Nanocomposites with 10 wt% AgNWs@SiO 2 exhibit the highest electromechanical sensitivity ( β= 9.04), about 12.6 times higher than that of pure PDMS at 1 kHz. The static contact angle of nanocomposties with 20 wt% AgNWs@SiO 2 reaches 129°. All the improved performances show great potential application for dielectric elastomer material and electrowetting devices.
研究领域:
材料科学
·
电气工程
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Chunhua Luo,Sihui Huang,Ting Zhang,Chunli Jiang,Ruijuan Qi,Mengqin Liu,Hechun Lin,Jadranka Travas-Sejdic,Hui Peng
Lead halide perovskites (LHPs) are very promising for new optoelectronic devices due to their excellent optical and electronic properties. However, the poor stability against water, heat and UV light greatly restricts their practical applications. In this work, a CH 3 NH 3 PbBr 3 /silicon oil/PDMS-urea composite is prepared by encapsulating CH 3 NH 3 PbBr 3 nanocrystals and silicon oil into the PDMS-urea polymer matrix . This composite shows characteristics of water-enhanced photoluminescence (PL) and water-driven PL recovery. After immersed in water, the photoluminescence quantum yield of the composite increases from initial 26.0%–52.2%, which is ascribed to the passivation of surface defects by the capping of polymer chains, H 3 O + and OH − . The composite possesses superior stability against UV light illumination in water. Furthermore, the composite film exhibits a capability of water-driven PL recovery after UV light irradiation. By applying alternate water/UV treatments, the PL can be reversibly switched “on and off”. The “on/off” ratio value of the PL intensity reached more than 4. These advantages make this composite highly promising in applications utilising luminescent switching and for under water lighting.
研究领域:
材料科学
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光学工程
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
·
IF 7.183
Chong Li,Jie Li,Wen-Hai Zhang,Naixin Wang,Shulan Ji,Quan-Fu An
Organic solvent nanofiltration (OSN) is emerging as an efficient and emerging approach for separation and purification of solute from organic solvents, which however were severely underdeveloped because of the low permeance of membranes. Herein, a novel mixed matrix membrane (MMM) was developed by incorporation of modified mesoporous silica nanoparticle (MSN) into commercially-available polydimethylsiloxane (PDMS) matrix for removal of trace impurities, such as Evans blue or vitamin B12, from different organic solvents. Notably, because of the designed nanoscale spaces originated from MSN, the permeance of the optimized MMM reached up to 31.2 L m −2. h −1. MPa −1 , around 17-fold enhancement compared with that of pristine PDMS membrane. Low-field nuclear magnetic resonance was employed to trace the solvent state in the MMM. The MMM exhibited high MeOH absorption capability but low-swelling attribute, certificating the high permeance and long-term stability of the MMM. The MMM was stably tested in MeOH solution for more than 80 h, indicating the great promise for future practical OSN applications.
研究领域:
材料科学
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化学工程
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分离技术
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REACTIVE & FUNCTIONAL POLYMERS
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2020
·
IF 3.333
Leipeng Liu,Ying Lei,Zhicheng Zhang,Jinru Liu,Shenghua Lv,Ziyi Guo
Since dielectric elastomers (DEs) can undergo muscle-like actuation under external electric fields, they show promising applications in fields such as actuators, generators, and biomimetic robots. However, traditional DEs require strong electric fields and pre-stretching to deliver useful deformation, limiting their practical applications. Herein, a novel method for preparing polydimethylsiloxane (PDMS) composites with high actuation under low electric field without pre-stretching is reported. In this method, polydopamine (PDA) is used to modify sandwich-structured silicon dioxide@graphite oxide hybrids (PDA@SiO 2 @GO). The inclusion of the SiO 2 layer improves the dielectric constant and reduces the dielectric loss of the composite, while the PDA shell improves the dispersibility of the filler. The PDA@SiO 2 @rGO/PDMS composite containing 5 wt% PDA@SiO 2 @GO exhibits a large actuated strain of 14.23% under an electric field of 33.19 kV/mm without pre-stretching; this value is 465% larger than that of pure PDMS and superior to those of most reported DEs composites. The results provide a promising new route to prepare high-performance DEs.
研究领域:
材料科学
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智能材料
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仿生机器人
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DOI
高影响因子
ACS Applied Bio Materials
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2019
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IF 0
Yinlei Lin,Deliu He,Huawen Hu,Peng Yi,Xiaoting Liu,Jianhui Huang,Shaozhen Wu,Guangji Li
Amphiphilic polyurethane elastomers (APUE) were synthesized using a two-step polyaddition reaction based on the hydroxyl-terminated polydimethylsiloxane (PDMS) and polyethylene glycol (PEG) soft segments with the molecular weights (Mw’s) of 2000 and 1000, respectively. The effects of the PDMS/PEG contents on the properties and structures of the APUE were investigated. It was found that the APUE possessed high elongation, moderate tensile strength, and good thermal properties. In addition, the APUE showed tunable oxygen permeability (Dk) and water vapor transmission rate (WVTR), and a similar WVTR to that of skin could be obtained for the optimized sample (APUE2). Importantly, APUE also exhibited excellent antibacterial efficacy against two kinds of bacteria along with impressive cytocompatibility. All of the results demonstrated that the synthesized APUE will hold substantial potential for biomaterial applications.
研究领域:
材料科学
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生物医学工程
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高分子化学
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DOI
PubMed
PROGRESS IN ORGANIC COATINGS
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2019
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IF 3.42
Yuemei Zhao,Enzhou Liu,Jun Fan,Bo Chen,Xiaoyun Hu,Yudong He,Chunliang He
A superhydrophobic polyester textile (SPT) with easily repairable ability was obtained by modifying pristine textile (RT) with PDMS and paraffin wax under 120 °C, the textile fiber became compact and exhibited clear micronano structures by a strong interact of PDMS/wax and textiles. The as prepared textiles exhibit satisfactory stability after mechanical abrasion and chemical-corrosion. Furthermore, the coated textiles possess excellent self-cleaning ability and could be used to selectively separate various kinds of oil-water mixture. More interestingly, the fabric can recover its super liquid-repellent property after drying at room temperature even after immersing in water for a week. This work provides a facile strategy to prepare an environment safety superhydrophobic polyester textile for practical utilization.
研究领域:
材料科学
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环境科学
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高影响因子
Biomimetics
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2022
·Vol. 7
·期 4
·217
·
IF 3.743
Jie Li,Yushan Li,Yiyi Lu,Wentian Shi,Huafeng Tian
With industry development, the separation of oily wastewater is becoming more critical. Inspired by organisms such as lotus leaves, biomimetic superhydrophobic surfaces with micro-nano structures have shown great potential in this regard. In this work, PDMS/PVDF oil–water separation membranes with designed microstructures were prepared by electrospinning technology. The membrane-forming effect of electrospinning with different ratios of PDMS and PVDF was studied. The study found that membranes with high PDMS content were more likely to form microspheres, and PDMS tended to concentrate on the microspheres. The results also showed that the microspheres would bring better hydrophobicity to the membrane. When the ratio of PDMS to PVDF is 1:2, the membrane has a water contact angle of up to 150° and an oil contact angle of 0°. At this ratio, the separation efficiency of the membrane for the water-in-oil emulsion is 98.7%, and it can still maintain more than 98% after ten separation cycles, which is a good candidate for oil–water separation. Furthermore, microspheres enable the membrane to achieve macroscopic uniformity and microscopic phase separation so that the membranes have both good elongation and fracture strength. In addition, the PDMS/PVDF membranes also exhibit excellent UV resistance, and their UV protection factor is greater than 185, making them a potential UV protective material.Keywords:electrospinning;polydimethylsiloxane;polyvinylidene difluoride;oil–water separation;UV protection
研究领域:
材料科学
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环境工程
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PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2013
·Vol. 20
·期 10
·1-9
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IF 2.019
Zhang Song,Zhan Shiping,Zhao Qicheng,Chen Shuhua,Liu Zhijun,Deng Jinjun
The dispersion polymerization of poly (L-lactide)(PLLA) in supercritical carbon dioxide (ScCO 2 ) with stannous octoate (Sn(Oct) 2 ) as a catalyst and n-butanol as an initiator was studied. An amphiphilic triblock copolymer was synthesized by the ring-opening polymerization ofε-caprolactone (ε-CL) with the hydroxylpropyl-terminated polydimethylsiloxane (HTPDMS) as the macromolecule initiator and then chosen as the stabilizer in the synthesis of PLLA. With the concentrations of 3 wt % (stabilizer/monomer), fine powder formed PLLAs were obtained. The effects of operating parameters such as pressure, temperature and stirring rate on the properties of the synthesized PLLAs were investigated. The results showed that the temperature had the greatest effect on the conversion and the stirring rate was the most important factor which determined the morphology of the products. An obvious increase of conversion was observed when the temperature increased from 80 °C to 100 °C. The influence of stirring rate on the morphology was achieved through the anchoring of the stabilizer with the growing polymer chains. The stirring rate of 300 rpm was turned out to be necessary and adequate. When the stirring rate increased or decreased out of the range of (300 ± 100)rpm, only agglomerates were obtained.
研究领域:
材料科学
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化学工程
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高分子化学
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高影响因子
Biomimetics
·
2022
·Vol. 7
·期 2
·50
·
IF 3.743
Xutao Ma,Xiaohui Fu,Jing Sun
As awareness of environmental protection increases, environmentally friendly coatings have been receiving great interest. Zwitterionic polymers are considered promising candidates due to their biocompatibility and excellent antifouling properties. In this paper, a type of polypeptoid containing zwitterions on the side chain was synthesized via ring-opening polymerization (ROP) and post-modification. This obtained polypeptoid was subsequently grafted onto the surface of polydimethylsiloxane (PDMS) via plasma and UV-induced surface polymerization. Surface morphology and protein adsorption tests of the resulting coating were systematically carried out. The results show that the modified coating has excellent antifouling properties and thus has great potential for environmentally friendly coating applications.Keywords:zwitterionic polymers;antifouling coatings;ring-opening polymerization
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Yongwei Ma,Qiang He
Paper-based materials are widely used in agriculture, industry and daily life because of their biodegradability , sustainability, biocompatibility and low cost. However, due to the hydrophilic nature of plant fibers in paper-based materials, the mechanical properties of paper will be reduced after absorbing water, thus limiting its application field. In this paper, carbon nanotubes/polydimethylsiloxane (CNT/PDMS) films with hydrophobicity and conductivity were prepared on filter paper by foam spraying method. Firstly, CNT and PDMS were added into water and stirred vigorously, and CNT/PDMS foam homogenate was prepared by foaming agent and stabilizer . Then, the homogenate was sprayed on the filter paper with a spray gun, and the multilevel rough structure was prepared on the paper. The results showed that the contact angle of the sample surface is greater than 150° when the spraying amount is 0.4-CNT, 0.6-CNT and 0.8-CNT, and the contact angle of 0.6-CNT is 156.33°, which is the largest. The drops on the surface of the sprayed sample have good bounce and self-cleaning performances. In addition, benefiting from the excellent conductivity of CNT, the particles composed of CNT and PDMS contact each other on the surface of the sample, forming a conductive network. The aforementioned properties will broaden the application scenarios of paper-based superhydrophobic materials.
研究领域:
材料科学
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表面工程
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高影响因子
TALANTA
·
2023
·
IF 6.1
Huihui Yu,Haijian Yang,Weishuai Liu,Longsheng Jin,Bing Jin,Meisheng Wu
A novel portable and disposable bipolar electrode (BPE)-electrochemiluminescence (ECL) device was fabricated for fumonisin B 1 (FB 1 ) detection. BPE was fabricated by using MWCNTs and polydimethylsiloxane (PDMS) due to their excellent electrical conductivity and good mechanical stiffness. After the deposition of Au NPs on the cathode of BPE, the ECL signal could be improved 89-fold. Then a specific aptamer-based sensing strategy was constructed by grafting capture DNA on Au surface, followed by hybridizing with aptamer . Meanwhile, an excellent catalyst, Ag NPs was labeled on aptamer to activate oxygen reduction reaction , leading to a 13.8-fold enhancement in ECL signal at the anode of BPE. Under the optimal conditions, the biosensor exhibited a wide linear range of 0.10 pg/mL to 10 ng/mL for FB 1 detection. Meanwhile, it demonstrated satisfactory recoveries for real sample detection with good selectivity , making it to be a convenient and sensitive device for mycotoxin assay.
研究领域:
分析化学
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食品安全
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生物技术
·
毒理学
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PubMed
高影响因子
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