POLYMERS FOR ADVANCED TECHNOLOGIES
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2021
·Vol. 32
·期 11
·4450-4463
·
IF 3.665
Kexin Chen,Dong Yang,Yongqian Shi,Yuezhan Feng,Libi Fu,Chuan Liu,Ming Chen,Fuqiang Yang
The design of high-performance compounded flame retardants based on multielement can be of great significance for reducing the flammability of polymer materials. In this article, a new type of N-P-Cu containing supermolecular assembly network (MPCSN) flame retardant was prepared and subsequently added into thermoplastic polyurethane elastomer (TPU)/silicon microencapsulated ammonium polyphosphate (SiAPP) composites. The obtained results indicated that a series of TPU/SiAPP/MPCSN composites exhibited strong adhesions with the TPU matrix. Additionally, the thermal and flame retardant performances of TPU composites were markedly improved after the introduction of different proportions of SiAPP to MPCSN. For example, the peak of heat release rate, the total heat release, the peak of smoke production rate, the total smoke release of the TPU composite containing 7.5 wt% SiAPP and 2.5 wt% MPCSN (TPU/SiAPP3/MPCSN1) remarkably decreased by 68.7%, 52.9%, 52.4%, and 49.4%, respectively, besides the highest LOI value (27.5 vol%) and UL-94 V-0 rating, compared with those of pure TPU. The improved flame retardance of the TPU/SiAPP3/MPCSN1 composite was due to the explanations: On one hand, a compact intumescent char effectively protected the TPU matrix from heat and oxygen and retarded the gaseous products permeation into the combustion zone; on the other hand, evolved phosphorus-containing free radicals captured the H• and HO• generated from the TPU material. The synergistic effect of SiAPP and MPCSN resulted in strong flame suppression, accompanied by 10.8% and 37.8% reductions in FIGRA and Av-EHC, respectively. This article offers a facile approach to fabricate highly effective flame-retardant TPU composites.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 10
·4061-4069
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IF 3.665
Fucheng Wu,Shanjun Gao,Yingying Zeng,Yunzhe Li,Zhixin Zhao,Chunhui Shen
Release agent is an indispensable kind of processing aids for composite molding. A kind of release agents was synthesized by using polyethylene glycol (M n = 200, 300, 400) with different molecular weight as raw material, reacting with fatty acids with different carbon chains length (lauric acid, myristic acid, hexadecanoic acid, and stearic acid), and further crosslinking with phosphoric acid. The chemical structure of the synthesized release agent was confirmed by FT-IR and 1 H-NMR. Through the performance test of the synthesized demolding agent, five release agents with excellent performance were screened out. The results showed: The release agents can be well dissolved in ethanol, a green and environment-friendly solvent. The molecular weight was 480–630. The release agent's acid value was between 0.05 and 0.06KOH/(mg/g). The peeling strength was 0.066–0.087 MPa and the interlaminar shear strength was 1.101–1.323 MPa. The film-forming time of the release agents on the mold was 1.5 min–3.5 min. The number of demolding was 16–20 times. The micro-morphology of the resin surface demolded by NnP release agent synthesized in the present study and Meishu brand release agent widely-used in the market was observed and compared by scanning electron microscope, indicating that the surface morphology of the resin demolded by NnP release agent was smoother after release. So the NnP release agents can be used in actual production.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 10
·4041-4051
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IF 3.665
Biao Wang,Dongsheng Zhao
In this study, sulfonated nanofiltration membranes were synthesized via interfacial polymerization (IP) of aqueous-phase piperazine (PIP), 3-amino-1-propanesulfonic acid (APA), and organic-phase trimesoyl chloride (TMC) monomers on porous substrates. Membranes with different APA contents were thoroughly characterized to determine how APA affected the physicochemical characteristics and perm-selectivity of the membranes. Membrane characterization confirmed the incorporation of APA into the generated polyamide (PA) layer. The optimal membrane performance was obtained at a 0.8 w/v% aqueous-phase APA content, where the enhanced membrane molecular weight cutoff (MWCO) and surface hydrophilicity resulted in a pure water permeability of 11.9 L m −2 h −1 bar −1 , approximately 13.1% higher than that of the blank membrane. Enhanced electrostatic repulsion of the APA-modified membrane on Na 2 SO 4 resulted in up to a 96.2% Na 2 SO 4 rejection rate. The 24.3% NaCl rejection rate resulted in NaCl/Na 2 SO 4 selectivity for the mixed-salt solution of the optimized membrane of 19.9, which was a significant increase over that of the blank. The embedding of APA did not affect the long-term stability of the NF membrane. The combined effects of the hydrophilicity, charge, and roughness of the membrane surface slightly enhanced the antifouling ability of the APA-modified membrane over that of the blank. This study provides a facile strategy for the fabrication of NF membranes with high perm-selectivity.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 33
·期 3
·687-699
·
IF 3.665
Olayinka Oderinde,Onome Ejeromedoghene,Guodong Fu
Tungsten oxide-based composites are important smart materials for wider usage in efficient energy windows, rewritable inks and other colored displays. However, the problem of agglomeration has made it challenging to be employed in transparent, photo-reversible materials especially in functional hydrogels. We herein report the preparation of high transparent hydrogel using water-soluble tungsten oxide-molybdenum oxide nanocomposites. The hydrogel was characterized with FTIR, TGA, XPS, SEM, and UV–Vis–NIR, while the mechanical properties were also analyzed. The FTIR confirmed that the metal oxides combined with the polymer units via strong metal-oxygen bond. For the TGA, the as-prepared hydrogel was still able to maintain a weight loss of 18.12% at 500°C compared to 10.45% for pristine hydrogel. Also, the EDX mapping revealed microscopic metal oxides particles sizes, without any cluster phenomenon appearance. Additionally, the as-prepared hydrogel revealed good mechanical properties as it could sustain a high deformation ratio ( λ ) of 86.3% at a stress of 60.3 MPa due to hydrogen bond crosslinking and ionic bond linkages. Moreover, the hydrogel exhibited high percentage transmittance (T%) of ~83%, as well as remarkable photochromic response, with absorption peaks at ~490, ~630 and ~730 nm appearing as the exposure time of the UV light increases. Furthermore, change in color was observed in 5 s, deepening to deep blue-black at 300 s exposure to UV, while complete reverse fading was achieved in ~6 h in ambient air without external stimulus, hence making it a good potential for applications in various optical memory, sensors and rewritable devices.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 5
·2082-2092
·
IF 3.665
Kezhong Wu,Pengyuan Fu,Zejin Wang,Qiongwei Zhao,Jianing Guo,Bei Ruan,Mingxing Wu
Doping transition metal ions into polyaniline (PANI) as an attractive electrode material have been regarded as one of the crucial factors to improve the capacitive performance and the cycle stability of supercapacitors due to their excellent metal properties and good conductivity. Herein, PANI has been prepared via in situ facile and low-cost electro-polymerization method. At a current density of 0.2 A g −1 , the supercapacitor using PANI electrode shows the specific capacitances of 203.0 F g −1 in 1 M H 2 SO 4 electrolyte. To further improve the electrochemical activity of PANI electrode, the transition metal ions M 2+ (M 2+ = Ni 2+ , Co 2+ , Mn 2+ , and Cu 2+ ) have been doped into PANI electrode via the same electro-polymerization method. And the supercapacitor with the different doped-PANI electrode generates the specific capacitances of 364.3, 326.1, 258.5, and 250.6 F g −1 respectively from PANI-Ni 2+ , PANI-Co 2+ , PANI-Mn 2+ , and PANI-Cu 2+ , which were superior to 79.5%, 60.6%,27.3%, and 23.4% of the pristine PANI based counterpart under the same test conditions and method. The favorable performances make the different doped-PANI act as a new resource of the high performance electrode materials of supercapacitor.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 6
·2352-2366
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IF 3.665
Feng-Jiao Li,Xi-Tong Yu,Zan Huang,Ding-Fu Liu
Grafting of polylactide (PLA) onto the cellulose nanofiber (CNF) (CNF-g-PLA) was prepared by in situ reactive extrusion using dicumyl peroxide (DCP) as a free radical initiator to improve the interfacial adhesion between CNFs and PLA. The effect of DCP content on the dynamic rheological properties, crystallization behavior, mechanical properties, and micromorphology of PLA/CNF (95/5) bionanocomposite was systematically investigated. FTIR spectra confirmed that PLA chains were successfully grafted onto the CNF surface by forming C C bonds. The presence of such C C crosslinks improved stress transfer at the CNF–PLA interface; SEM and TEM observations and adhesion factor calculated from DMA data confirmed that the synthesized graft copolymers improved the interfacial interaction between CNFs and PLA matrix, thus enhancing the mechanical properties of CNF-g-PLA nanocomposites. Compared with PLA/CNF (95/5) bionanocomposite, the maximum tensile modulus, tensile strength, elongation at break, and V-notched Izod impact strength of CNF-g-PLA nanocomposites were increased by 31.8%, 20.0%, 12.0%, and 27.9%, respectively. WAXD and DSC analyses indicated that the crystallinity degree of the grafted CNF-g-PLA was higher than that of PLA/CNF (95/5) bionanocomposite, and first increased and then decreased with increasing DCP content. The polarized optical micrographs confirmed that DCP-initiated grafting significantly increased the nucleation density but decreased the spherulite size of PLA. The melt strength of CNF-g-PLA nanocomposites was improved due to stronger intermolecular interaction by grafting. This one-step in situ reactive extrusion technology provides an efficient and economical way to enhance the properties of PLA/CNF bionanocomposites.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 6
·2339-2351
·
IF 3.665
Zeng Birong,Zhou Ruirui,Zheng Xianghong,Ye Jianyu,Chen Jinmei,Xu Yiting,Yuan Conghui,Dai Lizong
A new polyhedral oligomeric silsesquioxane (POSS) derivate bearing phenylboronic acid group and 6H-dibenzo[c,e][1,2]oxaphosphinine-6-oxide (DOPO) unit was synthesized and applied in flame retardant epoxy resin (EP). Compared to pure EP, EP/POSS-DOPO-(phenylboronic acid) composites had good transparency and better thermal stability. Micro-scale combustion calorimetry results showed that the addition of POSS-DOPO-(phenylboronic acid) hybrid could greatly reduce the PHRR and THR of EP/POSS-DOPO-(phenylboronic acid) composite. Simultaneously, the UL-94 of EP composite with 7% POSS-DOPO-(phenylboronic acid) achieved V-0 grade and the LOI value increased from 19.4% (neat EP) to 28.6%. Raman spectra results suggested that POSS-DOPO-(phenylboronic acid) hybrid enhanced the formation of residual char with graphitic structure during combustion. Besides, SEM characterization showed that the char of EP/POSS-DOPO-(phenylboronic acid) composite was much more continuous and compact in comparison with that of control samples. Moreover, the mechanical and dielectric properties of EP/POSS-DOPO-(phenylboronic acid) composites have been greatly improved for a better application.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 32
·期 3
·1239-1250
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IF 2.578
Shanjun Ding,Jun Zhang,Lin Zhou,Yunjun Luo
Polymer composites with self-healing ability are highly desired for applications in advanced modern devices. Here, we report on self-healing polymer composites consisting of silver deposited-carbon nanotubes hybrid nanoparticles (CNT-Ag) as fillers and self-healable polyurethane (DAPU) as a matrix based on thermally reversible Diels-Alder reaction. The results indicated that as the hybrid filler loading is 1 wt%, the composites not only obtained a high-strength (~15.97 MPa) and high healing efficiency (~90.1%) by increasing filler loading after healing, but also enhance thermal conductivity (~1.65 Wm −1 K −1 ) and obviously shorten its healing progress in comparison with other composites in the case of the same healing time. Given that Ag_NPs deposited on the surfaces of the CNTs act as bridges to link the adjacent CNTs and reduce interfacial thermal resistance, which can effectively explain the reasons for the obtained high mechanical strength and healing efficiency and promoting healing progress in the polymer composites. This work may offer a novel strategy for balancing relation between mechanical property, healing ability and healing progress in the field of self-healing materials application.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 32
·期 2
·525-537
·
IF 2.578
Qinqin Luo,Yulin Sun,Biao Yu,Jiangli Song,Dexin Tan,Jianqing Zhao,Shijing Yan
Flame retardants endow epoxy resins (EP) with flame retardance, however, their introduction often lead to the decrease in the glass transition temperature ( T g ), which is an important property for EP. Therefore, it is significant to design and synthesize a high-efficiency flame retardant that enhances flame retardance and T g of EP. To achieve this goal, a hyperbranched polyamide oligomer containing DOPO (HPD) was successfully synthesized by A 4 + B 2 polymerization and its structure was confirmed by FTIR, 1 H NMR, and 30 P NMR spectra and GPC. HPD was used as an additive flame retardant in epoxy resin, and its effect on the flame retardance and thermal properties of epoxy resin was studied. The epoxy resin with 7.5 wt% HPD reached UL-94V-0 rating and a higher LOI value of 29.6%, and its T g was 176.2°C, which is higher than the pure epoxy resin. Moreover, the results of cone calorimetry testing (CCT) and TG-FTIR analysis suggested that the gas-phase and condensed-phase flame-retarded roles of HPD delayed the time to ignition, and reduced the value of relevant combustion parameters, including the peak of heat release rate, average of heat release rate, total heat release, smoke production rate, and total smoke production. The analysis results of Py-GC/MS test of HPD further confirmed that HPD was able to play the flame-retarded role in the gaseous and condensed phases.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 32
·期 3
·1126-1134
·
IF 2.578
Xiangyun Mi,Xiuzhi Zhang,Mei Ding,Ming Zhang,Meishan Pei
Polycarboxylic acid dispersants (PCs) with comb-like molecular structure have become the focus of dispersants. However, there are many contradictions in the study of molecular structure of polycarboxylic acids. In this article, a series of PCs with different molecular structures were prepared from acrylic acid (AA) and methyl allyl alcohol polyoxyethylene ether (TPEG) by reversible addition fragmentation chain transfer (RAFT) polymerization. The structural characteristics of PCs were characterized by flourier transform infrared spectrometer (FT-IR), 1 H nuclear magnetic resonance (NMR) spectroscopy and gel permeation chromatography (GPC). The dispersion performance of PCs to cement was measured by the fluidity and adsorbing capacity. The results show that the dispersion performance and adsorbing capacity of PCs are significantly related to its structure. The adsorption and dispersion properties increase with the increase of carboxyl content and molecular weight. However, this phenomenon is limited to a certain range that the acid ether ratio in this range is no greater than 5:1, and the molecular weight is no greater than PC-4 ( Mw = 82 125, Mn = 63 889).
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 32
·期 2
·690-702
·
IF 2.578
Xiuzhen Wei,Shiyu Cao,Jiayao Hu,Yi Chen,Ruiyuan Yang,Jiahao Huang,Ze Wang,Qinghua Zhou,Jinyuan Chen
Graphene oxide (GO)/multi-walled carbon nanotubes (MWCNTs) modified nanofiltration (NF) membranes were successfully fabricated by interfacial polymerization of piperazine (PIP) and 1,3,5-benzenetricarbonyl trichloride (TMC). Compared with the pristine polyamide (PA) membrane and GO membrane, the typical structure of the granular protrusions on the surface of the GO/MWCNTs membrane gradually disappeared, and a regular ordered morphology appeared. The membrane thickness and surface roughness were increased according to the results of field emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM). The contact angle of GO/MWCNTs NF membranes progressively decreased from 57° to 23°, indicating the enhancement of surface hydrophilicity. The best NF performance was achieved when the ratio of GO to MWCNTs was 6:3 (G-M-3). The water flux was 55.6 L/m 2 .h, which was 33.7% higher than that of the GO membrane, and the rejection rate for Na 2 SO 4 was maintained at approximately 94%. Both modified NF membranes could treat actual dyeing-printing wastewater effectively. The anti-fouling performance of G-M-3 was better than that of G3. Therefore, GO/MWCNTs-modified NF membranes have a good application prospects in the field of wastewater treatment and water purification.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2020
·Vol. 32
·期 2
·641-650
·
IF 2.578
Jiantang Jiang,Yifeng Shen,Deyou Yu,Minghua Wu,Lei Yang,Shaoqi Li
The printing of polyester (PET) fabrics using binders and disperse dyes is an environmentally less harmful technique due to the exclusion of water-intensive washing processes. Unfortunately, the conventional polyacrylate (PA) binders are inapplicable for this printing technique as the high PA-disperse dye compatibility restrains the migration of disperse dye molecules from binder films into PET fabrics. Herein, we demonstrate a rational design and synthesis of novel PA binders by copolymerizing fluorosilicone monomers with multi-vinyl groups for the sustainable printing of PET fabrics. The incorporated fluorosilicone functionalities significantly decrease the solubility parameter of PA, facilitating the dye molecules migration toward PET fabrics. Meanwhile, the crosslink structure formed via vinyl groups restrains the migration of polymer chains and thus allows for the anchor of F/Si segments, enabling the continuous migration of disperse dyes. As a result, both the utilization ratio of disperse dyes and the color yield and fastness of printed PET fabrics are substantially improved. Moreover, the washing-free printing process using the developed binder can reduce 73% of water consumption, 74% of energy input, and 100% of wastewater discharge over the traditional printing process. Our study may provide insights into rational design of binders for the sustainable printing of PET fabrics.
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高影响因子
危险品化学品经营许可证（带存储）