POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 10
·3350-3358
·
IF 3.348
Chengbi Chang,Yanbin Wang,Yuya Horiuchi,Hyung Do Kim,Yawen Fang,Hideo Ohkita,Biaobing Wang
Herein, a simple and effective approach has been proposed to enhance the interfacial strength between multiwall carbon nanotubes (MWCNTs) and polymer matrix for improving the dispersion of MWCNTs. In more detail, a soluble polyaniline derivate containing polar group (POMA) was selectively incorporated into the binary blend of poly(amide-imide) (PAI) and MWCNTs. The surface energy and atomic force microscope measurements suggested that POMA was located at the interface of PAI and MWCNTs. Fourier transform infrared measurement indicated that POMA simultaneously interacted with MWCNTs and PAI by hydrogen bonding and π–π interaction, providing stronger interfacial strength between conductive filler and polymer matrix. As a result, the dispersion of MWCNTs and the surface roughness of PAI composites were obviously improved, which is helpful for charge and load transfer in the PAI/MWCNTs/POMA ternary films. As a result, the conductivity increased by 250% from 13 S m −1 for PAI/MWCNTs binary composites to 48 S m −1 for PAI/MWCNTs/POMA ternary composites, and the tensile strength increased from 52 MPa for PAI/MWCNTs binary composites to 66 MPa for PAI/MWCNTs/POMA ternary composites. These findings imply that polar aromatic polymers with suitable surface energy will be a desirable compatibilizer for optimizing the dispersion of carbon nanotubes in the polymer matrix.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2016
·Vol. 27
·期 9
·1211-1219
·
IF 1.823
Ting Ye,Juan Li
In this work, 12-tungestocobaltic acid based organic–inorganic hybrid material, [Bmim] 6 CoW 12 O 40 (CoW) was synthesized and applied as a synergist in polypropylene (PP)/intumescent flame retardant (IFR) composites. The flame retardant properties were investigated by the limiting oxygen index (LOI), UL-94 vertical burning test, thermal gravimetric analyzer (TGA), cone calorimeter and scanning electron microscopy (SEM) etc. The results showed that the PP composites with 16 wt% IFR and 1 wt% CoW achieves the UL-94 V-0 rating and gets a LOI value 28.0. However, only add no less than 25 wt% single IFR, can the PP composites obtain the UL-94 V-0 rating, which suggests that CoW has good synergistic effects on flame retardancy of PP/IFR composites. In addition, the SEM and cone calorimeter tests indicated the CoW improves the quality of char layer. The rate of char formation has been enhanced also because of the existence of CoW. It is the combination of a better char quality and a high rate of char formation promoted by CoW that results in the excellent flame retardancy of PP/IFR composites. Copyright © 2016 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 5
·1665-1676
·
IF 3.348
Haoyang Feng,Dandan Jin,Shuaipeng Wang,Jingyuan Hu,Jinyue Dai,Shifeng Yan,Xiaoqing Liu
Endowing epoxy resin with high performance, controllable degradation as well as feasible upcycling is a huge challenge. Herein, we synthesized a bio-based amine curing agent containing spiro diacetal unit using an environment-friendly method, then the controllable degradable epoxy resin was obtained after the curing reaction between diamine (DVPM) and bisphenol A epoxy resin (DGEBA). Results showed that DVPM-DGEBA resin performed high glass translation temperature of 136°C, glassy storage modulus of 3.93 GPa, and tensile strength of 85.9 MPa, owing to spiro diacetal unit and abundant methoxyl-related hydrogen bonds confirmed by non-isothermal fourier transform infrared spectra (FT-IR) and dynamic mechanical analyses. More importantly, DVPM-DGEBA resin could decompose into soluble linear oligomers in mild acidic solution. Systematically investigated by 1 H nuclear magnetic resonance, gel permeation chromatography, and FT-IR. Furthermore, the recycled oligomers could be reprocessed into thermosetting resins in the presence of diamines, and the upcycling resin performed high-performance (glass translation temperature of 170°C, glassy storage modulus of 6.03 GPa and tensile strength of 86.4 MPa) and flame-retardant (V-0 rating). This work gives us some new ideas to achieve the upcycling of the thermoset resin.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 7
·2265-2275
·
IF 3.348
Xuan Fei,Yingkang Zhu,Jinggang Wang,Zhen Jia,Xiaoqing Liu
To enhance the crystallization of poly(butylene 2,5-furandicarboxylate) (PBF) thus substitute its petroleum-based analogue poly(butylene terephthalate) (PBT), a series of high molecular weight poly(butylene-co-1,4-cyclohexanedimethylene 2,5-furandicarboxylate) (PBCF) copolyesters with low contents (0–19 mol%) of 1,4-butanediol (BDO) are synthesized from 2,5-furandicarboxylic acid (FDCA), 1,4-cyclohexanedimethylene (CHDM) and BDO. Their chemical structures and compositions are confirmed by nuclear magnetic resonance ( 1 H NMR and 13 C NMR). Their number average molecular weights are from 20,500 to 36,100 g/mol with the polydispersity index ( Ð ) of 1.67–1.99. The thermal stability and crystallization behaviors are investigated by thermogravimetric analyzer (TGA) and differential scanning calorimeter (DSC). Results show that PBCFs demonstrate comparable crystallization rate to PBT as the crystallization half time is from 18 to 29 s and the melting enthalpy is 34.1–41.4 J/g as well as the higher melting temperature of 238–263°C than 225°C for PBT. In addition, PBCFs exhibit excellent mechanical properties of tensile modulus between 1220 and 1510 MPa. These investigations suggest that a moderate amount CF unit can improve the melting temperature and enhance the originally weak crystallizability of furan-based polyesters. Generally, PBCFs can be the engineering plastic with satisfied thermal and mechanical performance.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 31
·期 8
·1847-1856
·
IF 2.578
Saijun Ye,Dafu Wei,Xiang Xu,Yong Guan,Anna Zheng
Antimicrobial polyamide (PA) received much attention for the demand of packaging and biomedical fields. In this paper, an antimicrobial PA6 membrane was prepared via a surface chemical reaction. A highly effective antibacterial component (PHMG-E) with terminal epoxy group was firstly synthesized via a reaction between polyhexamethylene guanidine hydrochloride (PHMG) and ethylene glycol diglycidyl ether (EGDE). Then, PHMG-E was bonded on the surface of PA6 membrane with secondary amine reduced by borane-tetrahydrofuran (BH 3 -THF). The antimicrobial rates of surface-modified PA6 membrane (PA6-PHMG) against Escherichia coli and Staphylococcus aureus were both higher than 99.99%, and the PHMG was non-leaching due to the chemical bonding. The hydrophilicity of antibacterial PA6 membrane was also significantly improved and the mechanical performance became better.
研究领域:
材料科学
·
生物医学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 9
·2449-2456
·
IF 2.137
Changjiang Zhu,Mingshan He,Jianguang Cui,Qilong Tai,Lei Song,Yuan Hu
In this work, a novel hyperbranched and phosphorus-containing triazine derivative (HPCFA) is synthesized. HPCFA is used as charring-foaming agent and combined with ammonium polyphosphate (APP) as intumescent flame retardant to flame retard polypropylene (PP). PP/HPCFA/APP composite can achieve limited oxygen index value of 31% and pass UL 94V-0 rating by addition of 20 wt% HPCFA/APP (1/2, w/w). Besides, HPCFA is compared with another hyperbranched charring-foaming agent (HCFA). HPCFA and HCFA have similar chemical structure, and their only difference is that HPCFA has phosphorus-containing unit in the main chain compared with HCFA. HPCFA/APP system exhibits superior flame retardancy compared with HCFA/APP system. Char residue analysis demonstrates that HPCFA/APP system can form denser and more compact char layer in comparison with that of HCFA/APP system.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 11
·4223-4232
·
IF 3.665
Yubin Li,Zhijian Yang,Xu Zhao,Jianhu Zhang,Ling Ding,Liping Pan,Congmei Lin,Xue Zheng
A novel thermally mendable polyurethane binder for energetic composites was designed and prepared via the Diels-Alder (DA) cycloaddition reaction between a furan functionalized polycaprolactone (PCL) prepolymer and a bismaleimide compound. The structures and properties of synthesized PCL-DA-PU were fully characterized via Proton Nuclear Magnetic Resonance ( 1 H-NMR) and Fourier Transform Infrared spectroscopy (FT-IR), Gel Permeation Chromatography (GPC), Thermogravimetric Analysis (TGA), and Differential Scanning Calorimetry (DSC) measurements. As-prepared material showed good self-healing ability of scratches by virtue of combining the shape recovery effect of PCL segments favoring scratch closure with the re-crosslinking of the cleaved DA bonds, which was evidenced by optical microscopy and tensile analysis. A scratch healing efficiency determined by tensile tests of about 89% was achieved. Moreover, with the contribution of DA bonds in PCL-DA-PU binder, the microcracks and other damages in the TATB based energetic composites were almost mended and the mechanical strength can recovery above 78%.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 27
·期 2
·169-177
·
IF 1.757
Jie Liu,Ru Cheng,Jianping Deng,Youping Wu
Chiral, pH-responsive hydrogels are constructed by poly(ethylene glycol) diacrylate/ α -cyclodextrin (PEGDA/ α -CD) inclusion complex and L- N -acryloyl-alanine or D- N -acryloyl-alanine (L-NAA or D-NAA) by an effective free radical polymerization approach. PEGDA containing two C=C end groups was used simultaneously to introduce α -CD units in the resulting hydrogels and to serve as a cross-linking agent, by which forming the designed hydrogels in quantitative yield. Hydrophilic α -CD moieties acted as pore-forming agent, while the L(D)-NAA-based polymer chains bearing –COOH groups enabled the hydrogels to display remarkable swelling–deswelling behavior in response to pH variation. The chiral NAA monomer-derived polymer chains rendered the hydrogels with intriguing optical activity, according to circular dichroism spectra. Scanning electron microscopy revealed the uniformly porous microstructures of hydrogels. More remarkably, the L-NAA-based hydrogels preferentially adsorbed trans -4-hydroxy- d -proline and preferentially released trans -4-hydroxy- l -proline, while D-NAA-based hydrogels provided opposite results. The hydrogels also demonstrated remarkable enantioselective release ability towards chiral drug ibuprofen. Copyright © 2015 John Wiley & Sons, Ltd.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 6
·1684-1696
·
IF 2.137
Xiaoyu Chen,Xiaomeng Wu,Zhongyong Fan,Qinghua Zhao,Qing Liu
The macroinitiator of poly(1,3-trimethylene carbonate) (PTMC) with number-average molecular weight ( ) of 9.6 × 10 3 g mol −1 was synthesized by ring-opening polymerization at 120°C. Then, the novel terpolymer P(TMC- b -( L LA- ran -GA)) consisting of PTMC homopolymer segment attached with various monomer molar ratios of L -lactide ( L LA) and glycolide (GA) random copolymerization block was prepared with about 5.0 × 10 4 g mol −1 by ring-opening polymerization in bulk at 140°C. The tailored molecular structures of P(TMC- b -( L LA- ran -GA)) were characterized by 1 H nuclear magnetic resonance, 13 C NMR, FTIR, and gel permeation chromatography, and chain microstructure analysis was performed in detail with 13 C NMR spectroscopy. The effect of GA units on the thermal and crystallization behaviors, mechanical properties, as well as biodegradability of terpolymers was investigated by differential scanning calorimetry, wide-angle X-ray diffraction, stress-strain measurements, and in vitro tests in comparison with corresponding poly(trimethylene carbonate- block - L -lactide) copolymer P(TMC- b - L LA). The results show that amorphous PTMC segments have a significant effect on condensed state behavior of the terpolymers, and the incorporation of GA units strongly decreases the crystallinity and crystallization ability of L LA segment within terpolymers because of more random L LA-GA sequence and shorter average L LA block length. Meanwhile, the toughness of materials is greatly improved, and in vitro degradation is also accelerated. Peripheral vascular stents were 3D printed for the first time and met the requirements for application. The results show totally biodegradable terpolymers with unique molecular structure, and modifiable properties are promising new biomaterials with advanced performance for biomedical application.
研究领域:
生物材料学
·
高分子化学
·
医学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 5
·1655-1664
·
IF 3.348
Wei Dong,Shian Zhou,Fuping Qian,Qing Li,Gang Tang,Tengfei Xiang,Hong-ming Long,Tiejun Chun,Jinli Lu,Yunlong Han
A hierarchical structure similar to “lotus leaf surface” has attracted widespread attention due to its excellent hydrophobic properties. Herein, using low-temperature sol–gel method prepared superhydrophobic SiO 2 particles with biomimetic lotus leaf micro/nanoscale hierarchical structure (BRHS), which were formed in situ on the surface of polyethylene terephthalate (PET) fiber, and endowing PET-based composite filter media (P-Filter) superhydrophobic property. After different TEOS@MTES@ KH550 (TMK) modification treatments, SiO 2 particles were wrapped on the P-Filter, and the microscopic pore structure was changed significantly. When the mass ratio of TEOS/MTES (TM) reached 4/2, KH550 modified SiO 2 nanoparticles displayed the widest particle size distribution. In this case, the PET (TMK@PET-4) fibers exhibited rough morphology of BRHS, the contact angle (WCA) reached 160.9 ± 2.8°, and the shedding angle (WSA) was 5.9 ± 2.5°, which reaching a superhydrophobic state. Also, the TMK@PET-4 filter material demonstrated best comprehensive filtration performance for PM 0.3 ( η : 99.12%, Δ P : 58 Pa, Q F : 0.0816), 36.96% higher than the original PET filter, and had excellent mechanical stability and self-cleaning properties. Therefore, the presented simple method has a guiding significance in producing superhydrophobic P-Filter, a potential value for the research and development of bag-type dust removal materials in high-humidity environments.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 33
·期 4
·1222-1232
·
IF 3.665
Bei Liu,Kai Jin,Jie Tao,Hao Wang,Dan He,Huaguan Li
In this study, we proposed a machine learning (ML) method to optimize the comprehensive performance of shape memory epoxy polymers (SMEPs) based on experimental data as samples. Firstly, a series of SMEPs specimens were prepared, and their properties were evaluated respectively by testing four indexes including the glass transition temperature ( T g ), bending strength, strain fixation rate ( R f ), and strain recovery rate ( R r ). Subsequently, ML used these experimental data as samples for feature learning to investigate the influence of each component on these properties. The results indicated that methyltetrahydrophthalic anhydride was more favorable to T g and bending strength than methylhexahydrophthalic anhydride (MHHPA) as a curing agent. However, a certain amount of MHHPA must be included in the system to guarantee a higher R f and R r . Moreover, the right amount of bisphenol A cyanate ester in the system improved the comprehensive properties of SMEPs, especially the shape memory effect. Finally, a SMEPs system with superior properties was acquired through the optimization of four indexes of T g , bending strength, R f and R r . Therefore, this study shows that ML methods can also be used to investigate SMEPs that require more specific excellent performance.
研究领域:
材料科学
·
人工智能
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 31
·期 3
·407-414
·
IF 2.162
Hongxin Wang,Baijun Liu,Mingyao Zhang,Shuai Du,Gaocheng Wu,Yiwei Hu,Jinhui Zhang,Xiangchi Liu
The increasing demand for monodispersed cross-linked polymers in high-quality applications requires continuous improvement in their preparation process. In this study, an appropriate amount of a chain transfer agent was added to a traditional cross-linking system, resulting in the preparation by one-step dispersion polymerization of cross-linked polystyrene (PS) microspheres with a particle size of 3.867 μm and a diameter coefficient of variation of 0.011. The particles were characterized using scanning electron microscopy (SEM) and an Ubbelohde viscometer. The results show that the tertiary dodecyl mercaptan (TDDM) chain transfer during nucleation increases the oligomer concentration, promotes the aggregation of the oligomers, increases the primary particle size, and reduces the cross-linking effect. This controls the volume of cross-linked chains in the primary particles, thus avoiding the problem of poor dispersion of the polymer microspheres due to the introduction of divinylbenzene (DVB). This study produces a preparation method for cross-linked microspheres.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）