POLYMER DEGRADATION AND STABILITY
·
2015
·
IF 3.163
Panyue Wen,Xiaofeng Wang,Xiaming Feng,Keqing Zhou,Bin Yu,Qiangjun Zhang,Qilong Tai,Lei Song,Yuan Hu,Richard K.K. Yuen
High flammability has always been a major challenge hindering in application of most conventional UV-curable resins. Herein, several intumescent flame-retardant (FR) films characterized with crosslinked network structure were successfully prepared via the combination of tri(acryloyloxyethyl) phosphate (TAEP) with melamine-based acrylate resin (MAAR) by UV-cured method. As compared with sole TAEP- or MAAR-containing films, the mixed films containing TAEP and MAAR exhibited improved flame retardant property. The characterizations of their flammability and char morphologies indicated that the PN-2 with 2/1 mass ratio of TAEP to MAAR had the relatively better flame retardance and could form the intumescent char layer with many thin-walled large bubbles under the compact surface layer. Furthermore, the evolved products for PN-2 with 2/1 mass ratio of TAEP to MAAR during the thermal degradation exhibited much less release than neat TAEP- or MAAR-containing coatings, which implied the increase of the pyrolysis products inside the char layer and thus leaded to the expansion of the intumescent FR films. These results suggest the UV-curing intumescent FR films containing TAEP and MAAR with appropriate ratio possess great flame retardant efficiency that in favor of further application on a substrate, such as fabrics, wood, and plastics.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Shaodong Hou,Li Ling,Chii Shang,Yinghong Guan,Jingyun Fang
Haloacetonitriles (HANs) are the most frequently found nitrogenous disinfection by-products (N-DBPs) in water. This study investigated the degradation of HANs, including dibromoacetonitrile (DBAN), monochloroacetonitrile (MCAN), dichloroacetonitrile (DCAN) and trichloroacetonitrile (TCAN) in the UV/persulfate process. DBAN was efficiently degraded by the direct UV photolysis, while chlorinated HANs (CANs) were more efficiently degraded by the UV/persulfate process than by the UV or UV/H 2 O 2 process. The degradation kinetics of MCAN, DCAN and TCAN by SO 4 − followed second order kinetics at the rate constants of 7.48 (±0.58) × 10 7 M −1 ·s −1 , 6.36 (±0.16) × 10 7 M −1 ·s −1 and 2.43 (±0.15) × 10 7 M −1 ·s −1 , respectively, which were 10 times higher than those by OH. The degradation rates increased with increasing persulfate dosages and temperatures, but were suppressed by natural organic matter and bicarbonate. The degradation of CANs in the UV/persulfate process was initiated by hydrogen abstraction and C C bond breakage by SO 4 − instead of C Cl bond cleavage, and followed by subsequent oxidation and hydrolysis to produce Cl − , NO 3 − , CO 2 and H 2 O. This study demonstrates that SO 4 − is more suitable than OH for the degradation of CANs, but the effective dehalogenation of aliphatic halogenated compounds by SO 4 − still requires at least one hydrogen or carbon atom connecting to an alpha carbon.
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SURFACE REVIEW AND LETTERS
·
2016
·
IF 0.435
HAFEEZULLAH MEMON,SOHAIL YASIN,NAZAKAT ALI KHOSO,SAMIULAH MEMON
The multifunctional textiles are interesting areas to be researched on. In this paper, the effect of the fiber nanocoating on the wrinkle recovery, air permeability and anti-Ultraviolet (UV) property of different woven fabrics using sol–gel method has been studied. The sol–gel method has various advantages over other methods. Along with these properties, no change in visual appearance has also been discussed in this paper. The dispersion of nanoparticles of titanium was obtained into silica sol. The characterization of nanocoating was done using Field emission scanning electron micrograph (FESEM) and Fourier transform infrared spectroscopy (FTIR) studies. The fabric wrinkle recovery properties, air permeability and anti-UV performance were analyzed using three different immersion timings into the nanosol. The results revealed that both wrinkle recovery properties and anti-UV performance have increased with respect to immersing time of the nanocoating although a slight decrease in air permeability and whiteness index of the fabric was also observed.
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PROGRESS IN ORGANIC COATINGS
·
2016
·
IF 2.632
Liyan Zhao,Mengying Wei,Jun Nie,Yong He
UV-curable fluorine-containing polyacrylic epoxy prepolymers were prepared by solution free radical polymerization with n -butyl acrylate (BA), glycidyl methacrylate (GMA) and hexafluorobutyl acrylate (HFBA) as co-monomers．The prepolymers with different molecular weight and fluorine content could be photopolymerized with up to 70% epoxy group conversion after 10 min of UV irradiation. They showed satisfactory compatibility and could form homogeneous cured film with commercial photoinitiator and monomer , evidence with transmittance, mechanic and graphic analysis. Also, they exhibited very good surface tension as low as 24.38 dyn/cm and their glass transition temperature and thermo decomposition temperature raised with the increase of fluoro-content.
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POLYMER
·
2016
·
IF 3.586
Jin Wang,Hongming Zhang,Yuyang Miao,Lijun Qiao,Xianhong Wang,Fosong Wang
UV-curable waterborne polyurethanes (CO 2 -UV-WPUs) with CO 2 -polyols as soft segment were firstly synthesized. In addition to the good mechanical performance, the coexistence of carbonate and ether moieties in soft segment assured the excellent hydrolysis resistance of CO 2 -UV-WPU compared with polybutylene adipate glycol based waterborne polyurethane (PBA-UV-WPU). Its retention of tensile strength reached 88% after 15 h immersion in 1.5% sodium hydroxide solution, while that of PBA-UV-WPU completely lost its mechanical property. The double bond density primarily governed the mechanical performance of CO 2 -UV-WPU, when it increased from 0.93 mmol/g to 2.4 mmol/g, the tensile strength increased from 29 MPa to 67 MPa, while elongation at break decreased from 150% to 9.6%, accompanied by the reduction of maximum water swelling percentage from 26.7% to 14.5%. The introduction of CO 2 -polyol as soft segment not only created a route to produce UV-curable waterborne polyurethane from CO 2 , but also provided polyurethane with novel value-added performance like good hydrolysis resistance. Moreover, the thermal/mechanical performance and hydrophilicity of CO 2 -UV-WPUs could be conveniently adjusted by controlling molecular weight of CO 2 -polyols, ensuring the application feasibility of CO 2 -UV-WPU.
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NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 18
·9762-9768
·
IF 3.269
Rui Chen,Ting Li,Qi Zhang,Zhongyang Ding,Piming Ma,Shengwen Zhang,Mingqing Chen,Weifu Dong,Weihua Ming
We synthesized two reactive quaternary ammonium methacrylate compounds (QAC-10 and QAC-12) bearing hydrophobic tails with different alkyl chain lengths. Cross-linked films with excellent antimicrobial properties were obtained from a mixture of a polyurethane acrylate prepolymer and a reactive QAC via one-step UV curing. The QAC-containing films showed total kill against both Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus epidermidis (S. epidermidis) at QAC-12 concentrations as low as ∼2.5 wt% relative to the polyurethane acrylate prepolymer, which was substantially lower than the QAC amount needed in the films containing QAC-10 with a shorter hydrocarbon tail (C10H21). Compared with the QAC-10-containing films, the higher antimicrobial potency in the QAC-12-containing films was the consequence of the longer hydrophobic alkyl tail (C12H25), which offered a stronger driving force for the surface enrichment of the QAC and, thus, greater surface charge density (the longer tail may also penetrate the cell membrane more easily due to stronger hydrophobic interactions). A zone of inhibition test confirmed that the antimicrobial effect of these films was on the basis of contact killing and there was no leaching of antimicrobial species from the cross-linked films.
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PROGRESS IN ORGANIC COATINGS
·
2015
·
IF 2.358
Jingcheng Liu,Ren Liu,Xiaopeng Zhang,Zhiquan Li,Hongtao Tang,Xiaoya Liu
A series of multi-arms cardanol-based acrylates (CGHA, CDHA, CTHA) were synthesized using renewable cardanols and bio-based polyols (glycerol, diglycerol, tripilyglycerol) as precursors. The structures and molecular weights of the cardanol-based acrylates were characterized by FT-IR, 1 H NMR and GPC , respectively. The synthesized multi-arms cardanol-based acrylates were used to produce UV-curable films and coatings. High mechanical strength as well as good biodegradability of the UV-cured films was obtained. The important coating film properties, such as hardness, gloss and adhesion were also investigated. The results showed that the coatings with high bio-based content exhibit good adhesion, gloss and acid-resistance, which is comparable to the soybean oil (AESO)-based and polyester acrylate.
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JOURNAL OF MATERIALS SCIENCE
·
2014
·Vol. 50
·期 5
·2239-2246
·
IF 2.305
Hu Lei,Cheng Xinjian,Zhang Aiqing
It is of importance to prepare self-healing materials using reversible covalent bonding within polymers. In this work, we introduced ethyl 4-aminocinnamate (EA) to polyphosphazenes to prepare a novel self-healing elastomer via the reversible photochemical [2+2] cycloaddition. Linear polymer, poly[( n -butylamino)
x
(ethyl 4-aminocinnamate)
y
] phosphazene, was synthesized firstly via the ring-opening polymerization, and then substitution reaction was conducted to introduce EA as side groups. Consequently, the damaged polyphosphazenes were re-healed by being exposed to UV light. Their structures were characterized by 1 H-NMR, 31 P-NMR, FTIR, and GPC; thermal properties were tested by TGA and DMA. The [2+2] cycloaddition reaction and retro-[2+2] cycloaddition were investigated by UV–vis. The results showed that the broken polyphosphazenes could be self-healed by the UV light irradiation at 365 nm. The damaged polyphasphozene could be re-healed almost completely within about half an hour.
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JOURNAL OF MOLECULAR STRUCTURE
·
2013
·
IF 1.404
Zhihua Cui,Xin Li,Xidong Wang,Kemei Pei,Weiguo Chen
Two N -heterocycle-containing benzotriazole compounds ( CBHDCP , CBMPP ) were synthesized and their structures were confirmed by FT-IR, 1 H NMR, mass spectroscopy and elemental analysis. Their spectral properties compared with that of a common commercial benzotriazole UV absorber Tinuvin 326 in solvents were measured and analyzed using molecular orbital calculations. It was found that the experimentally obtained optical properties were in close agreement with the theoretically obtained results. Besides, CBMPP is much superior to CBHDCP acting as an effective UV absorber on polyethylene terephthalate fabric due to its combinative higher exhaustion and higher molar extinction coefficient. The exhaustion difference on polyethylene terephthalate fabric among N -heterocycle-containing benzotriazoles ( CBHDCP , CBMPP ) and Tinuvin 326 were then measured and explained by the solubility parameter theory. The results agreed with the rule that compounds with higher exhaustion on fiber have solubility parameter much closer to that of fiber polymer.
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JOURNAL OF FLUORINE CHEMISTRY
·
2015
·
IF 1.948
Cui Liu,Jun Nie,Yong He
Fluorine-containing polyacrylic acrylate prepolymers, with different molecular weight and fluorine content, were successfully synthesized by solution radical polymerization of acrylate monomer and following esterification. The compatibility of the prepolymers with solvents and acrylate monomers could be improved markedly with introduction of butyl acrylate as co-monomer and decreasing the polymer molecular weight. It could form homogeneous solution in solvents and monomers and transparent cured film combined with commercial photoinitiator and monomer, evidenced with vision, transmittance, dynamic mechanic and graphic analysis. At the same time, this kind of prepolymers could perform rapid photopolymerization and reach about 95% double bond conversion after 90 s ultraviolet irradiation. It also showed unique surface tension as low as 24.9 dyn/cm and lower glass transition temperature ( T g ) with higher fluorine concentration. This kind of novel prepolymer could be widely used in photopolymerization for low surface tension and high optical demands.
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SOLID STATE SCIENCES
·
2017
·
IF 1.811
Zhongqi Zhu,Ke Zhang,Heyun Zhao,Jing Zhu
Hexagonal CePO 4 nanorods were synthesized via a simple hydrothermal method without the presence of surfactants and then characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet-visible (UV–vis) absorption and photoluminescence (PL) spectroscopy. UV-light driven photocatalytic activities of hexagonal CePO 4 nanorods were detailedly demonstrated via degrading different organic dyes such as congo red (CR), organic rhodamine B (RB), methyl orange (MO) and methylene blue (MB) since these nanorods exhibit strong UV absorption with the cutoff edge of about 420 nm.
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Nanoscale
·
2025
·Vol. 17
·期 8
·4676-4686
·
IF 5.1
Bingying Chen,Junli Guo,Chen Chen,Yueling Shen,Yaoyao Yang,DengGuang Yu
Thermoplastic polyurethane (TPU) fabrics often possess good mechanical, waterproofing, and breathability properties. However, the resistance of TPU to excessive ultraviolet (UV) irradiation is poor and often does not meet the UV resistance requirements of fabrics. Electrospun nanofibers with a side-by-side structure can combine the advantages of different materials. Therefore, in this study, a series of Janus composite nanofiber membranes with side-by-side structures were prepared by eccentric electrospinning using polyacrylonitrile (PAN), titanium dioxide (TiO2), and TPU as raw materials. The Janus structure of the nanofibers was evident in scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images. Wettability and breathability tests showed that the nanofiber membranes exhibited waterproofing and breathability properties. The Janus composite nanofiber membrane with 1 wt% titanium dioxide TiO2 exhibited a UV-protection factor (UPF) as high as 1962 and a UV transmittance of less than 2.5%, with the amount of TiO2 added being proportional to the UV resistance. Additionally, the UV resistance of the nanofiber membranes did not decrease substantially after seven days of immersion in solutions at different pH values. Finally, this study analyzed the mechanism by which the Janus structure enhanced the UV resistance. The UV light was reflected, refracted, and absorbed many times on the crescent side with excellent UV-absorption performance, which greatly improved the UV resistance of the membrane.
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PubMed
高影响因子
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