Polymer-Plastics Technology and Materials
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2019
·
IF 0
Wang Wenqi,Ying Jie,Ma Xiangyan,Wang Jikui,Xinyuan Guan,Ting Wei,Ziming Qian
Monomer cast nylon was incorporated with different contents of kaolin, which is grafted with poly (ethylene glycol diglycidyl ether) via in-situ polymerization. The influence of treated-kaolin and kaolin contents on composites properties was studied. Treated-kaolin has a better effect on the properties of nylon than kaolin. Thermogravimetric analysis and Differential scanning calorimetry analysis show that that the feeding of kaolin improved thermal stability and crystallinity of nylon. The results indicate that using treated-kaolin as reinforcement, the composites displayed remarkable mechanical properties, the tensile strength and notched impact strength are 83.6 MPa and 4.46 MPa, respectively. The water absorption capacity of composites was greatly reduced by 50% with the feeding of kaolin.
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Materials Research Express
·
2018
·Vol. 5
·期 6
·065316
·
IF 1.151
Xiaoyan Gao,Yu Mao,Lingli Ni,Xiufang Zhu,Suqin Zhou,Shan Yun,Kun Hong,Jinquan Wang
In this work, in order to improve the dispersion and reinforcement of waterborne polyurethane (WPU), nano-SiO2 was modified with a amphiphilic polymeric surfactant poly(propylene glycol) phosphate (PPG Phosphate) and oleic acid for comparison, then incorporated into WPU through in situ polymerization. The results show that both of the PPG phosphate and oleic acid were successfully grafted onto nano-SiO2 surface and significantly improved its hydrophobic property. Scanning electron microscopy (SEM) observation reveals that PPG phosphate modified SiO2 nanoparticles had good compatibility with WPU and uniformly dispersed into WPU matrix. The results also show that the tensile strength, water resistance and thermal stability were all significantly improved by incorporation of nano-SiO2, especially PPG phosphate modified SiO2, which was attributed to its good dispersion in WPU and strong interface adhesion.
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高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 6
·385
·
IF 3.504
Junkai Gao,Wenwen Tao,Dian Chen,Xiuwang Guo,Yan Chen,Yanjun Jiang
Nanoflower-like wrinkled mesoporous silica (NFMS) was prepared for further application as the carrier of polyethylene glycol (PEG) to fabricate the new, shape-stabilized phase change composites (PEG/NFMS); NFMS could improve the loading content of PEG in the PEG/NFMS. To investigate the properties of PEG/NFMS, characterization approaches, such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), thermal gravimetric analysis (TGA), Brunauer-Emmett-Teller (BET) analysis, and differential scanning calorimetry (DSC), were carried out. The characterization results illustrated that the PEG was completely adsorbed in the NFMS by physical adsorption, and the nanoflower-like wrinkled silica did not affect the crystal structure of PEG. As reported by the DSC test, although NFMS had a restriction influence on the activity of the PEG molecules, the melting and binding enthalpies of the PEG/NFMS could reach 136.6 J/g and 132.6 J/g, respectively. In addition, the TGA curves demonstrated that no evident weight loss was observed from 20 °C to 190 °C for the PEG/NFMS, and the results revealed that the PEG/NFMS had remarkable thermal stability. These results indicated that the NFMS is a potential carrier of organic phase change material for the preparation of shape-stabilized phase change composites.Keywords:phase change materials;wrinkled mesoporous silica;polyethylene glycol;thermal energy storage
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PubMed
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2018
·
IF 1.551
Tengyang Zhu,Xing Yang,Yayun Zheng,Xiaoqi He,Feifei Chen,Jujie Luo
A series of poly(amide- co -poly(propylene glycol)) (PA-PPG) random copolymers with different content of PPG were designed by polycondensation reaction. These random copolymers were blended up to 60% with commercially available Pebax 2533. The blend membranes were characterized by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscope (SEM). Gas permeation properties of these blend membranes were investigated using five single-gases (CO 2 , H 2 , O 2 , CH 4 , and N 2 ) at different temperature of 25–55°C and 1.0 atm. The impacts of content of PA-PPG with different PPG content and operating temperature on CO 2 separation properties of Pebax/PA-PPG blend membranes were studied. The results showed that CO 2 permeability gradually increased with the increasing operating temperature, whereas CO 2 permeability gradually decreased with the increase in content of PA-PPG. CO 2 /N 2 selectivity gradually increased with the increase in content of PA-PPG. In particular, Pebax/PA-PPG (50)–60% displayed excellent CO 2 and O 2 separation properties ( P CO2 = 79.7 Barrer and P O2 = 13.6 Barrer, CO 2 /N 2 = 34.7 and O 2 /N 2 = 5.9) at 25°C and 1.0 atm. POLYM. ENG. SCI., 59:E14–E23, 2019. © 2018 Society of Plastics Engineers
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高影响因子
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2018
·
IF 1.911
Yongli Shi,Jintao Xue,Zhaojie Liu,Mengjiao Du,Lanting Xu,Qianqian Sun,Zhaomin Liu,Qing Shang
In this study, a novel chitosan (CS)-modified nanoparticles (NPs) were developed to orally deliver tolbutamide (TOL). Methoxy poly(ethylene glycol)- b-poly(ε-caprolactone) carboxylates (mPEG2000-b-PCL4000) was synthesized via an esterification reaction. CS-modified mPEG2000-b-PCL4000-COOH NPs (CS@NPs) were fabricated by injecting mPEG2000-b-PCL4000-COOH NPs suspension (1.0 mg/mL) into CS solution (1.0 mg/mL, pH 5.0). Fourier transform infrared spectroscopy (FTIR) spectra were used to confirm the obtaining of mPEG2000-b-PCL4000-COOH. Transmission electron microscope (TEM) was carried out to observe morphology of all NPs. Nano ZS90 Malvern ParticleSizer were used to monitor the size distribution of obtained NPs. Thermogravimetry analysis (TGA) was performed to investigate the thermostability of CS@NPs. In vitro TOL release profiles were carried out in pH 1.2 and 7.4 buffers. FTIR spectra confirmed the obtaining of mPEG2000-b-PCL4000-COOH. TGA curves indicated that the protection of CS shells improved the thermostability of mPEG2000-b-PCL4000-COOH NPs. Cell tests indicated the CS@NPs had no obvious cytotoxicity, and they were easily taken up by 293T cells. In vitro release profiles showed that 91.0 ± 1.9% of encapsulated TOL were released from TOL-CS@NPs in pH 7.4 buffer. Therefore, the positive potential of CS@NPs could increase their combining capacity with intestinal mucosal cells. Finally, these NPs would improve the bioavailability of hydrophobic drugs.
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PubMed
高影响因子
FUEL
·
2019
·
IF 5.128
Xingmao Jiang,Shuang Zhu,Jiajun Gao,Yaqian Yu,Chunyan Xiong,Chunxi Li,Weimin Yang
Polyethylene glycol [PEG, H(OCH 2 CH 2 ) n OH] like PEG-600, a green extractant for organic N-compounds in fuel oil, was very active for non-basic nitrogens but not effective for basic ones. Modification of PEG that replaced –OH group with –OCH 2 COOH group can produce HOOCCH 2 (OCH 2 CH 2 ) n OCH 2 COOH (dcPEG). For denitrogenation, dcPEG-600 was highly effective for both basic and non-basic nitrogens. N-distribution coefficient [ D N , (μg N ·g dcPEG −1 )/(μg N ·g oil −1 )] of dcPEG-600 to n -octane can reach as high as 200 for indole, 92.6 for pyrrole, 42.0 for quinoline, and 81.5 for pyridine, respectively. Besides, denitrogenation selectivity of dcPEG-600 to toluene ( D N / D toluene ) can amount to 462 for indole, 230 for pyrrole, 146 for quinoline, and 366 for pyridine, respectively. The high performance was ascribed to contribution of active O atom on ether group and active H atom on –COOH group. The active O atom (Lewis basic site) formed H-bond with the non-basic nitrogen (Brønsted acid). The active H atom (Brønsted acidic site) not only interacted with the basic one (Lewis base) but also brought in the good selectivity. Moreover, dcPEG-600 was still effective for real oil and could be recycled for several times without the denitrogenation performance significantly decreasing.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2019
·
IF 2.298
Chunli Li,Xuefei Wang,Hao Li,Cong Duan,Le An,Qing Liu
Experimental liquid–liquid equilibrium (LLE) data for the system ethylene glycol (EG) + 1,2-butanediol (1,2-BD) + 3-heptanone were measured at atmospheric pressure at 293.15, 303.15, and 313.15 K and the ternary LLE for systems of EG + 1,2-BD + anisole were also investigated at 303.15 K at 101.3 KPa by using liquid–liquid equilibrium kettle method. Distribution coefficient and selectivity were obtained and applied to evaluate the extraction capacity of 3-heptanone and anisole. The reliability of the experimental data was confirmed by the Hand correlation and the Othmer–Tobias correlation. The experimental LLE data were correlated by NRTL and UNIQUAC models, and the corresponding parameters were obtained. The root-mean-square deviations (RMSD) between the experimental data and calculated values were less than 1.22%. Topological concepts related to the Gibbs stability test were used to validate the consistency between model parameters and experimental data. The liquid–liquid equilibrium data provide the basic physicochemical properties for design of extraction process of 1,2-BD from EG by 3-heptanone and anisole. According to comprehensive correlation coefficient analysis, 3-heptanone is more suitable for the extraction of 1,2-BD from EG than anisole.
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POLYMERS & POLYMER COMPOSITES
·
2019
·
IF 0.683
Yongji Gong,Weihua Song,Yifan Wu,Daohai Zhang,Yufei Liu,Qian Zhao,Min He,Xiaolang Chen
The poly(l-lactide-b-ethylene glycol-b-l-lactide) (PLLA-PEG-PLLA) triblock copolymers with different chain segment length are fabricated by ring-opening polymerization. The structure, molecular weight, and crystallization behaviors of the triblock copolymers are characterized by Fourier transform infrared, nuclear magnetic resonance spectroscopy, gel permeation in chromatography, X-ray diffraction, differential scanning calorimetry, and polarizing optical microscopy (POM). The results show that the increase of block length is beneficial to improve its crystallization. In addition, the triblock copolymer exhibits a double crystallization phenomenon. The POM results indicate that PEG and PLLA chains of the copolymer crystallize in their respective crystallization temperature regions. The growth rate of the PLLA spherocrystal decreases and the dendritic spherocrystals appear with increasing the PEG chain length when the PLLA chain of the copolymer is isothermal crystallized at 80°C and PLLA chain length is constant. The growth rate of the PEG spherocrystal decreases and the spherocrystal morphology changes little with increasing PLLA chain length when the PEG chain is isothermal crystallized at 25°C and the length of PEG chain remained unchanged.
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高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 21
·期 19
·5414-5426
·
IF 9.405
Yu Ding,Jingxia Tian,Wei Chen,Yejun Guan,Hao Xu,Xiaohong Li,Haihong Wu,Peng Wu
Copper-based catalysts, with highly dispersed and stabilized Cu nanoparticles, intensified mass transfer and a well-balanced Cu0/Cu+ ratio at low Cu loadings, are highly desirable for the selective hydrogenation of ethylene carbonate to ethylene glycol and methanol, an efficient indirect route of CO2 utilization. A hierarchically core/shell-structured Silicalite-1@Cu composite was developed via a base-assisted chemoselective host–guest interaction between the silicon species of MFI-type Silicalite-1 and external Cu salt source. In situ generated mesoporosity and strong Cu–silicate interaction made the uniform Cu NPs firmly immobilized and highly dispersed outside the core S-1 crystals. The S-1@Cu hybrid possessed the co-existing Cu0/Cu+ active species with a suitable ratio, and served as a highly active, selective and robust catalyst for selective ethylene carbonate hydrogenation, providing a lifetime >350 h together with >99% ethylene carbonate conversion, >99% ethylene glycol yield, and more importantly 93% methanol yield at a relatively low Cu loading of 21.4 wt%.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yu Wang,Haojie Yu,Li Wang,Lei Zhang,Jian Yang,Chenguang Ouyang,Jian Hu,Jingyi Feng,Zheng Deng,Chang Chen
Efficient glycemic control serves as the cornerstone of diabetes and its complication treatments, necessitating additional symptomatic medications or nutritional supplements tailored to various complications. However, different diseases and medications require specific treatment regimens and drug delivery methods. For instance, conventional subcutaneous insulin injections suffer from uncontrollable release rates and onset times. This study has developed a segmented microneedle array that integrates two controlled-release mechanisms within a single array. Different drugs are loaded into distinct regions, allowing for modular and simultaneous timed-release therapies. The posterior segment of the microneedle tip releases insulin via a glucose-sensitive mechanism, enabling real-time intelligent glycemic regulation and effective glycemic control for up to 43.7 h, which is nearly 8 times longer than subcutaneous injections. The anterior segment releases vitamin B9 via a sustained-release mechanism, which has potential preventive and reparative effects on diabetic neuropathy, providing a gentler and more sustained nutrient supply. The regionalized design of the microneedles significantly enhances drug delivery efficiency and the intelligent customization of drug release, especially in managing diabetic neuropathy.
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PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2015
·Vol. 38
·期 15
·2700-2707
·
IF 2.737
Xiudan Hou,Hui Yu,Yong Guo,Xiaojing Liang,Shuai Wang,Licheng Wang,Xia Liu
A new polyethylene glycol/graphene oxide composite material bonded on the surface of a stainless-steel wire was used for solid-phase microextraction. The layer-by-layer structure increased the adsorption sites of the novel fiber, which could facilitate the extraction of trace compounds. The polyethylene glycol/graphene oxide was characterized by Fourier transform infrared spectroscopy and elemental analysis, which verified that polyethylene glycol was successfully grafted onto the surface of graphene oxide. The performance of the polyethylene glycol/graphene oxide coated fiber was investigated for phenols and phthalate esters coupled with gas chromatography with flame ionization detection under the optimal extraction and desorption conditions, and the proposed method exhibited an excellent extraction capacity and high thermal stability. Wide linear ranges were obtained for the analytes with good correlation coefficients in the range of 0.9966–0.9994, and the detection limits of model compounds ranged from 0.003 to 0.025 μg/L. Furthermore, the as-prepared fiber was used to determine the model compounds in the water and soil samples and satisfactory results were obtained.
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PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2016
·Vol. 54
·期 16
·2571-2581
·
IF 3.114
Yan Zhang,Miao Wang,Jinhai Ye,Meidong Lang
Novel poly( ε -caprolactone)- b -poly(ethylene glycol)- b -poly( ε -caprolactone) (PCL-PEG-PCL) bearing pendant hydrophobic γ -(carbamic acid benzyl ester) groups (PECB) and hydrophiphilic amino groups (PECN) were synthesized based on the functionalized comonomer γ -(carbamic acid benzyl ester)- ε -caprolactone (CABCL). The thermal gelation behavior of the amphiphilic copolymer aqueous solutions was examined. The phase transition behavior could be finely tuned via the pendant groups, and an abnormal phenomenon occurred that the sol–gel transition temperature shifted to a higher temperature for PECB whereas a lower temperature for PECN. The micelles percolation was adopted to clarify the hydrogel mechanism, and the effect of the pendant groups on the micellization was further investigated in detail. The results demonstrated that the introduction of γ -(carbamic acid benzyl ester) pendant groups significantly decreased the crystallinity of the copolymer micelles whereas amino pendant groups made the micelles easy to aggregate. Thus, the thermal gelation of PEG/PCL aqueous solution could be finely tuned by the pendant groups, and the pendant groups modified PEG/PCL hydrogels are expected to have great potential biomedical application. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54 , 2571–2581
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高影响因子
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