REACTIVE & FUNCTIONAL POLYMERS
·
2011
·
IF 2.546
Gang Zhang,Dong-sheng Li,Guang-shun Huang,Xiao-jun Wang,Sheng-ru Long,Jie Yang
Two kinds of monomers containing the thioether units 4,4′-thiodibenzoyl chloride (T-DC) and 4,4′-bis(4-chloroformylphenylthio)benzene (BPB-DC) were synthesized in two steps and were reacted with diamine-containing thioether (–S–) and sulfone units to prepare a polyamide containing high contents of thioether groups. The intrinsic viscosities of the polyamides were 0.81–0.93 dl/g. These polymers had good optical properties , including an optical transmittance of the aromatic polyamide film at 450 nm that was higher than 90%. Additionally, the high quantity of thioether units provided the polymers with high refractive indices of 1.710–1.716 and low birefringences of 0.007–0.009. These polyamides also had excellent thermal properties, with glass transition temperatures ( T g ) of 230–246 °C and initial degradation temperatures ( T d ) of 477–473 °C. Finally, they showed improved solubility in polar aprotic solvents .
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
Polymers
·
2020
·Vol. 12
·期 10
·2284
·
IF 3.426
Rui Huang,Jinshui Yao,Qiuhong Mu,Dan Peng,Hui Zhao,Zhizhou Yang
Silicone resin is a high-temperature resistant material with excellent performance. The improvement of its thermal stability has always been the pursuit of researchers. In this paper, a sequence of silicone resins containing trifluorovinyl ether groups were prepared by the co-hydrolysis-polycondensation of methyl alkoxysilane monomers and {4-[trifluorovinyl(oxygen)]phenyl}methyldiethoxysilane. The structures of the silicone resins were characterized by FT-IR and1H NMR. The curing process of them was studied by DSC and FT-IR spectra, and results showed that the curing of the resins included the condensation of the Si-OH groups and the [2 + 2] cyclodimerization reaction of the TFVE groups, which converted to perfluorocyclobutane structure after curing. The thermal stability and thermal degradation behavior of them was studied by TGA and FT-IR spectra. Compared with the pure methyl silicone resin, silicone resins containing TFVE groups showed better thermal stability under both N2and air atmosphere. Their hydrophobic properties were characterized by contact angle test. Results showed that PFCB structure also improved the hydrophobicity of the silicone resin.Keywords:silicone resin;trifluorovinyl ether group;thermal stability;degradation
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
POLYMER INTERNATIONAL
·
2012
·Vol. 61
·期 5
·800-809
·
IF 1.902
Gang Zhang,Jiangjun Hu,Huiwen Yang,Xiaojun Wang,Shengru Long,Jie Yang
4,4′-Bis(4-chloroformylphenylthio)benzene was synthesized in two steps and was reacted with diamine-containing thioether and amide units to prepare a polyamide containing high contents of thioether groups. The intrinsic viscosities of the polyamides were 0.76–0.87 dL g −1 . These polyamides had excellent thermal properties, with glass transition temperatures of 234.8–269 °C and initial degradation temperatures of 461–469.7 °C. They showed improved solubility in polar aprotic solvents and could form moderate strength films with a tensile strength of 75.2–111.6 MPa and storage modulus of 1.0–1.3 GPa (at 220 °C). These polymer films also had good optical properties, including an optical transmittance of the aromatic polyamide film at 450 nm that was higher than 90%. Additionally, the high quantity of thioether units provided the polymers with high refractive indices of 1.700–1.704 and low birefringences of 0.007–0.008. Copyright © 2012 Society of Chemical Industry
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 ENGINEERING AND SCIENCE
·
2017
·Vol. 58
·期 9
·1523-1529
·
IF 1.449
Yusheng Dong,Jizong Chen,Fredrick Nzioka Mutua,Yuanbo Gao,Tingting Yang,Yong He
To modify the properties of poly(hexamethylene oxamide) (PA62), amine-terminated polyoxypropylene glycols (PGs) were introduced into the polyoxamide main chain as soft segments. A series of PA62/PG2 copolymers were synthesized successfully by a two-step method. Fourier transform infrared spectroscopy, solution proton nuclear magnetic resonance spectroscopy ( 1 H-NMR), differential scanning calorimetry, thermogravimetric analysis, and wide-angle X-ray diffraction were used to analyze the structures and to investigate the properties of these copolymers. The saturated water absorption was also evaluated by gravimetric analysis for PA62/PG2 copolymers. The results revealed the incorporation of PG2 effectively modified the properties of PA62 and the copolymers with PG2 content of 10–20 mol% possessed high melting point (293°C–314°C), good thermal stability and low saturated water absorption. POLYM. ENG. SCI., 58:1523–1529, 2018. © 2017 Society of Plastics Engineers
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2025
·Vol. 36
·期 1
·e70059
·
IF 3.4
Qinqin Luo,Yulin Sun
To achieve effective flame retardancy and improved toughness in epoxy resin (EP) without compromising strength and modulus, a new derivative containing phosphaphenanthrene and phenyl propyl ether groups (HPMD) has been developed and used as an additive. The structure of HPMD has been fully characterized, and the properties of HPMD and modified EP have been thoroughly studied. The phenyl propyl ether group in HPMD can undergo Claisen type rearrangement to form benzopyran during heat treatment and subsequently polymerize by curing via the CC bond in the benzopyran. The unique rigid and flexible structures of HPMD allow it to disperse in the EP matrix through melting. Dynamic mechanical analysis suggests that HPMD has a high degree of interpenetration in the EP matrix, resulting in a single-phase structure for the epoxy resins containing HPMD. Notably, incorporating only 4 wt% HPMD content into the polymer matrix yields a flame-retarded, toughened, and strengthened EP. EP containing 4 wt% HPMD (EP4; phosphorus content of only 0.33%) displays a limiting oxygen index value of 31.1% and exhibits a UL94 V-0 rating. Compared with that of EP, the combustion of EP4 exhibits a decrease in the peak of heat release rate, maximum average heat rate emission, average heat release rate, and total heat release, along with an increase in the char yield, further indicating that HPMD effectively retards the combustion of EP. Moreover, EP4 displays improvements in tensile strength, elongation at break, flexural strength, flexural modulus, and impact strength of 18.4%, 9.7%, 14.9%, 19.1%, and 26.7%, respectively, compared with unmodified EP. Analysis of HPMD's flame-retardant action suggests that it exhibits flame-retardant activity simultaneously in the gas and condensed phases. Significant progress has been demonstrated toward the development of a meltable epoxy resin additive that combines flame-retardant, toughening, and strengthening functions while avoiding phase separation from the epoxy resin.
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
BIOMACROMOLECULES
·
2019
·
IF 5.667
Jihong Wang,Dongdong Li,Wei Tao,Yang Lu,Xianzhu Yang,Jun Wang
In this work, novel amphiphilic diblock copolymers of polyethylene glycol and polyphosphoester with pendant thioether groups, denoted as mPEG-b-PMSPEP, were synthesized through the ring-opening polymerization of functionalized cyclic phosphoester monomer using methoxy poly(ethylene glycol) and Sn(Oct)2 as the macroinitiator and catalyst, respectively. The successful synthesis was confirmed by 1H, 13C, 31P nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC). These amphiphilic block copolymers self-assembled spontaneously in the aqueous solution, and the formed nanoparticles were sensitive to the oxidation that induced the hydrophobic to hydrophilic transition for its PMSPEP core under triggering of H2O2 and the subsequent dissociation of the nanoparticles. In addition, the reactive oxygen species (ROS) generated by light and the photosensitizer were also capable of carrying out the oxidation of these nanoparticles. Their oxidation profiles were systemically evaluated by 1H NMR. Finally, the mPEG-b-PMSPEP nanoparticles were used to coencapsulate the photosensitizer chlorin e6 (Ce6) and anticancer drug paclitaxel (PTX), achieving the photoaccelerated PTX release via oxidation of the nanoparticles by the generated ROS under light irradiation. Meanwhile, the in vitro cytotoxicity assays indicated that these nanoparticles coencapsulated with PTX and Ce6 showed a combined cell-killing effect toward MDA-MB-231 tumor cells, exhibiting great potential for drug delivery systems that realize the synergistic chemo-photodynamic therapy for cancer treatment.
研究领域:
生物材料
·
药剂学
·
肿瘤治疗
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2024
·
IF 1.4
Jiajia Zhang,Xueni Sun,Hui Shao
The lowered dispersibility of carboxylic acid polymers in the seawater system with high salt content results in reduced scale inhibition efficiency. To solve this problem, a series of carboxylic acid polymers containing ether groups were prepared by free radical polymerization using α-allyl glycerol ether (AG) and vinyl monomers containing different numbers of carboxylic acid groups (acrylic acid [AA], maleic acid [MA], itaconic acid [IA], and aconitic acid [ANA]) as raw materials, and their scale inhibition properties in artificial seawater were studied. The static test results demonstrate that IA-AG outperforms the other three polymers containing ether carboxylic acid in terms of scale inhibition performance, with CaCO 3 and CaSO 4 having scale inhibition rates of 95.16% and 98.73%, respectively. Furthermore, molecular dynamics (MD) simulation was employed to investigate the mechanism of scale inhibition by simulating the interaction between ether carboxylic acid polymers and the crystal surface. The results show that the order of binding energy between polymers and crystal faces is IA-AG > ANA-AG > MA-AG > AA-AG. The simulation results are in agreement with the experimental phenomena. The polymers can overcome their own deformation and adsorb on the crystal surfaces, thus inhibiting the growth of scale.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 34
·27197-27204
·
IF 3.84
Guangzhou Cao,Xiangfeng Guo,Lihua Jia,Xuhua Tian
A series of novel cationic surfactants, N-alkylcaramoylmethyl-N-[2-(2-phenoxyacetamido)-ethyl]-N,N-dimethylammonium chloride, were synthesized and their chemical structures were characterized using 1H-NMR, 13C-NMR, ESI-MS and FT-IR. Their aggregation behaviours in aqueous solution were systematically investigated by surface tension and electrical conductivity methods. It was found that the surfactants have higher surface activity compared with a similar structural surfactant. A series of thermodynamic parameters of aggregation indicate that the aggregation is entropy-driven at the investigated temperatures. In addition, they possess excellent bactericidal activities against the selected strains.
研究领域:
化学
·
生物学
·
医学
✓ 已验证
DOI
高影响因子
IONICS
·
2024
·
IF 2.4
Wang Qiqi,Zhang Jingchun,Zhang Yilin,Song Shengjiao,Wang Guowei,Zhuang Linghua,Chen Xiaojun
In this paper, functional ether-based ionic liquids with bromide and dicyanamide anions were prepared and characterized. The introduction of ether group into imidazolium cation decreased the relative viscosity of ionic liquids, while increased density and electrical conductivity values of ionic liquids. The refractive index, density, thermal stability, electrical conductivity, and ESW values of ionic liquids decreased with the increase of alkoxyalkyl chain length from methoxyethyl to methoxypropyl, while the relative viscosity of ionic liquid increased from the methoxyethyl to the methoxypropyl group. The refractive index, relative viscosity, density, and thermal stability of bromide ionic liquids were higher than those of dicyanamide ionic liquids, while the electrical conductivity and ESW values of dicyanamide ionic liquids were higher than those of bromide ionic liquids. DFT simulation results demonstrated the introduction of ether group into imidazolium cation increased anion-cation interactions of ionic liquids, resulting as lower HOMO–LUMO ( E gap ), lower interaction energy (Δ E ), and shorter average hydrogen bond length values. The anion-cation interactions among ionic liquids decreased when ether group changed from methoxyethyl to methoxypropyl. The cation–anion interactions of dicyanamide ionic liquids were much stronger than those of bromide ionic liquids. These results will shed light on the design and preparation of functional ionic liquid electrolytes for the renewable energy storage devices.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Jiru Xu,Yonghua Liu,Mei-Jin Li
A series of new ruthenium(II) polypyridine complexes appending with thioether groups were designed, synthesized and characterized. The sensing ability of the complexes toward mercury ions were studied by electronic absorption and emission spectra, and the reaction of the complexes with mercury ions were also confirmed by ESI mass spectroscopy and 1 HNMR spectroscopy. The thioether groups would react with mercury ion fast to form aldehyde group leading to the significant change in the spectra. The color of the complex changed from yellow to orange after addition of mercury ions, and the color of the emission changed from red orange to dark red with a large red shift (~80 nm). Importantly, these kinds of ruthenium(II) complexes show a unique recognition of mercury ions over other metal ions . The complexes with more thioether groups also showed a better sensitivity toward mercury ions, this is good strategy for the further design of the new phosphorescent probes for sensing of mercury ions.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2021
·
IF 4.43
Guang-ming Yan,Han Wang,Dong-sheng Li,Hao-ran Lu,Sui-lin Liu,Jie Yang,Gang Zhang
Development of high temperature shape memory polymers with fast response time and recyclable performance is highly desired. In this study, a new semi-aromatic tri-amine (TRIA) containing thioether unit is prepared through the reaction of trifluoro-monomer and p-mercaptoaniline (p-MA). It is conducted to polymerize with 4,4′-thiodibenzoyl chloride (TDC) and different ratios of diamine (both of them contained flexible thioether group) to supply a series of slightly crosslinking semi-aromatic polyamide . It is found that the resultant polymers had excellent thermal properties (T g , 237.9–245.8 °C, T d , 430.9–436.5 °C) and mechanical properties (tensile strength, 74–100 MPa). Because of the introduction of the large amount of flexible thioether group, the resultant polyamides can be dissolved in some aprotic solvents , and can be processed with solution method to fabricate a series of fast-responsive shape memory film (SMF) with a responsive time of 6–8 s, recovery rate of 98–99.5% after 20 cycles. What's more, the oxidized film can even lift a weight equal to about 2–3 times (vertical direction) and 5–8 times (horizontal direction) of its own weight. Interestingly, unlike other shape memory polymers, these SMF after multiple processes (after bending-recovery cycle at high temperature) can still be processed repeatedly with a solution route, which supplies a novel and recyclable candidate for excellent performance SMP. It is expected to be used in solar cell wingspan actuator to light the satellite weight.
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
MACROMOLECULAR BIOSCIENCE
·
2023
·Vol. 23
·期 3
·2200498
·
IF 4.6
Yitao Sun,Yu Zhang,Xin Guo,Yanping Wang,Pan He,Chunsheng Xiao
Reactive oxygen species (ROS) in biological tissues are in a state of dynamic balance. However, many diseases such as cancer and inflammation, are accompanied by a long-term increase in ROS. This situation inspires researchers to use ROS-sensitive nanocarriers for a site-specific release of cargo in pathological areas. Polyamino acid materials with good biodegradability, biocompatibility, and regular secondary structure are widely used in the biomedical field. Herein, a new oxidation responsive PEGylated polyamino acid is synthesised for anticancer drug delivery by ring-opening polymerisation of N -carboxyanhydrides bearing thioether pendants. The obtained block copolymer mPEG- b -PMLG self-assembles into spherical nanoparticles (NPs) in water with diameter ≈68.3 nm. NMR measurement demonstrated that the hydrophobic thioether pendants in the NPs can be selectively oxidised to hydrophilic sulfoxide groups by H 2 O 2 , which will lead to the disassociation of NPs. In vitro drug release results indicated that the encapsulated Nile red is selectively released in the trigger of 10 mM H 2 O 2 in PBS. Finally, anticancer drug doxorubicin (DOX) is encapsulated to the NPs, and the obtained NPs/DOX exhibits an improved antitumor efficacy in 4T1 tumour-bearing mice and lower cardiotoxicity than free DOX. These results indicates that the mPEG- b -PMLG NPs are promising for anticancer drug delivery.
研究领域:
生物材料学
·
药剂学
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）