JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 139
·期 12
·51821
·
IF 3.125
Jun Wu,Dun Wang,Fanrong Meng,Jihui Li,Chunqing Huo,Xueyu Du,Shuying Xu
In this study, coconut coir was chemically converted to coir-polyols (CP) via atmospheric liquefaction under microwave assistance, during which a combination of polyethylene glycol 400 and glycerol, and 98% sulfuric acid were applied as the liquefaction solvents and catalyst, respectively. The obtained CP was then analyzed in terms of its molecular weight distribution, hydroxyl values, and functional groups. Later, CP/polyvinyl alcohol (PVA) bio-composite films reinforced without and with coir cellulose nanofibrils (CCNF) were prepared. After comprehensive characterization, the CP/PVA films exhibited higher stability in medium-temperature range, while the CCNF/CP/PVA films on the other hand possessed higher properties of tensile strength, elongation at break, and water resistance. The proper dosage of reinforcing agents for preparing PVA-based ternary blend films were proposed at 3% of CCNF and 10% of CP (based on film dry weight), which exhibited the best balance of properties in the critical parameters such as tensile strength and elongation at break.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52012
·
IF 3.125
Yongxian Shen,Hongjun Zhou,Qingbing Guo,Hongchao Hu
In this study, the persimmon tannin powder modified polyurethane foam (PTP-PUF) was synthesized. The morphology of the foam was observed by SEM, the thermodynamic stability and mechanical properties of PTP-PUF were discussed for application. The effect of persimmon tannin powder content and initial pH on Cu(II) and Pb(II) biosorption on PTP-PUF was investigated. The adsorption equilibrium data for Cu(II) and Pb(II) fitted the Freundlich model and Langmuir model well, respectively. And the maximum adsorption capacity of PTP-PUFs for Cu(II) and Pb(II) ions were 96.06 and 112.2 mg/g at pH 5 and 323 K. The kinetic data was tested using pseudo-first-order and pseudo-second-order models. The results suggested that the pseudo-second-order model was the best one to describe the adsorption behavior of Cu(II) ( R 2 > 0.997) and Pb(II) ( R 2 > 0.985) onto PTP-PUF.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52030
·
IF 3.125
Huijian Ye,Huilei Jiang,Zhenggang Luo,Lixin Xu
Polymer film capacitor exhibits extensive applications in advanced electronics because of its flexibility and huge power density. The current research interests of polymer capacitor are addressed on large energy density and high charge–discharge efficiency of composite film. Here we developed the compatible elastic interface composed of hyperbranched poly(methyl acrylate) copolymer in graphene/poly(vinylidenefluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) nanocomposite with high energy capability. This hyperbranched copolymer comprising polyethylene core that was grafted with poly(methyl acrylate) (PMA) segments and pyrene units was synthesized by atom transfer radical polymerization. The few-layer graphene was exfoliated with assistance of hyperbranched copolymer that was attached on surface of flakes via π-π non-covalent interactions between pyrene groups and delocalized π electrons of nanosheets. Graphene/P(VDF-TrFE-CFE) nanocomposite film was prepared by solution casting method. The compatibility between graphene and fluoropolymer is greatly improved due to the elastic interphase of PMA segments in hyperbranched copolymer, which enhances the interfacial polarization and decreases the accumulation of charge carriers under high electric field. The energy density of 7.0 J/cm 3 with charge–discharge efficiency of 60% at 300 MV/m is achieved for 0.1 wt% nanocomposite. This work reveals an effective architecture of polymer composite with elastic interface to increase the energy capability of polymer dielectric film.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52031
·
IF 3.125
Jianming He,Shaoying Liu,Dongliang Chen,Gongying Wang,Qingyin Wang,Yuansheng Bai
The melamine formaldehyde (MF) resin fiber has been used in various fields due to its excellent heat resistance, but it's mechanical properties still need to be improved. Using melamine and paraformaldehyde as raw materials, 1,4-cyclohexanedimethanol (CHDM) as the comonomer, a series of modified fibers with different copolymerization ratios are prepared by dry spinning. The research results show that melamine, paraformaldehyde, and CHDM can co-polymerize by one-step. The introduction of CHDM can effectively improve the heat resistance and mechanical properties of the fiber. When the addition amount of CHDM is 6%, the copolymeric fibers are cylindrical with a smooth surface and bubble-free inside, the breaking strength is 1.80 cN/dtex and the elongation at break is 13.75%. Compared with the unmodified fiber, the breaking strength is decreased by approximately 5%, and the breaking elongation is increased by nearly 90%. The thermal properties of the copolymeric fibers are not decreased, and the mass residual rate at 400°C is increased from 36.12% to 46.11%. This study provides a method of copolymeric-modified without fiber-forming aid to prepare high-performance MF fibers.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52041
·
IF 3.125
Zhiyuan Song,Jie Wang,Qian Tao,Yang Yu,Hui Zhang,Chuanqun Hu,Hongyu Cen,Xuan Zheng,Tao Hu,Chonggang Wu
Zn-salt poly(styrene– ran –cinnamic acid) (SCA–Zn) ionomers were successfully synthesized via the melt neutralization of poly(styrene– ran –cinnamic acid) (SCA), which has a comparable molecular weight ( = 217,000) to commercial polystyrene (PS), with different mass fractions of ZnO (0.62, 1.6, and 3.9 wt.%) and the successful synthesis was confirmed by Fourier transform infrared spectroscopy. The mechanical properties, heat resistance, and processibility of the PS, SCA, and SCA–Zn samples were characterized. Compared to SCA, the three SCA–Zn ionomers exhibited significantly higher α cN values, with the ionomers containing 1.6 and 3.9 wt.% ZnO were 11.4% and 68.6% higher than that of SCA, respectively. Compared to commercial PS, SCA–Zn also exhibited significant improvements in heat resistance (glass transition temperature and vicat softening temperature both improved by about 20 °C) and impact toughness ( α cN values of the ionomers containing 1.6 and 3.9 wt.% ZnO were 69.6% and 156.5% higher than that of PS), while the processability of SCA–Zn was not significantly worse than that of PS. This method efficiently improves both the toughness and heat resistance of PS, providing an efficient way to expand the market application of styrenic resins.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52016
·
IF 3.125
Xiaolong Lu,Jianshu Wang,Shuwei Cai,Ben Niu,Qin He,Xianru He
Recently, the research of blending anti-aging modification of nitrile butadiene rubber (NBR) has been widely reported, but the surface effect in the rubber aging process has been obviously ignored. Starting from the surface microstructure design, the construction of surface protection barrier may be a new anti-aging way. In this paper, the surface superhydrophobic NBR surf -polydopamine (PDA)-(SiO 2 -g-PFOMA) is prepared through a ordered modification of two-step physical deposition to NBR with PDA and SiO 2 grafted with Perfluorooctylmethacrylate (SiO 2 -g-PFOMA). By comparing the mechanical properties before and after aging, it is found that the DA surface pretreatment significantly improves the NBR thermo-oxidative aging. On this basis, surface superhydrophobic SiO 2 -g-PFOMA microstructure has set up to further prevents NBR from the attack of corrosive media such as acid, alkali, salt and water. After aging in HCl solution at 90°C for 96 h, the fracture strength, elongation and aging coefficient of NBR surf -PDA-(SiO 2 -g-PFOMA) compared with unmodified NBR(KB) were increased by 2.28 MPa, 48.76% and 0.18, respectively. This work can offer an surface anti-aging technology to NBR.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52036
·
IF 3.125
Jiahao Zou,Huajun Duan,Junjun Zhang,Jianfan Cao,Chenhao Zhang,Chao Wan,Huiru Ma
In order to comply with the environmentally friendly flame retardant requirements of epoxy resin and strive to maintain the comprehensive performance of the epoxy resin matrix, a P/N/S-containing heterocyclic halogen-free reactive flame retardant (VAP) was constructed. Vanillin (VA), 2-amino-5-mercapto-1,3,4-thiadiazole, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene10-oxide (DOPO) were chosen as raw materials to prepare VAP through a simple one-pot reaction. The addition of VAP slightly decreased the curing activity of the system while the transparency of the samples was maintained well. Moreover, the maximum degradation rate of VAP modified samples dropped by 47.26% and the amount of char residue at 800°C increased. When 10 wt% VAP (0.66 wt% P) was added, EP-10 passed UL-94 V-0 rating and the limited oxygen index value reached 30.3%. In contrast to pure EP, the peak heat release rate, total heat release, and total smoke production of EP-10 were reduced by 36.87%, 25.61%, and 29.07%, representing good smoke and heat suppression effect. Besides, the glass transition temperature ( T g ) of the samples remained above 165°C, showing a slight drop. Due to the existence of heteroatoms and the introduction of heterocyclic structure, the enhancement of intermolecular force in the system counteracted the deterioration of mechanical properties caused by the reduction of crosslinking density, maintaining the excellent mechanical properties of epoxy resin.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 16
·52003
·
IF 3.125
Qiang Gu,Thomas L. Eberhardt,Jingjing Shao,Hui Pan
To improve the compatibility of an organosolv lignin (OL) in polylactic acid (PLA) blends, a green approach was pursued whereby the lignin was modified with propylene carbonate (PC) to increase its aliphatic hydroxyl content, and thereby, its reactivity. The oxyalkylated organosolv lignin (OOL, synthesized at 170°C) was analyzed by quantitative 31 P NMR and showed the number of phenolic hydroxyls decreased from 4.73 to 0.16 mmol·g −1 , and the number of aliphatic hydroxyls increased from 3.56 to 3.92 mmol·g −1 . OOL-g-PLA copolymer (OOLPC) samples were prepared by graft polymerization of L-lactide with the OOL and showed the molecular weights (M n ) to range from 12,343 to 16,834 Da, increasing with the lignin loading of the copolymer. Scanning electron microscope indicated that the graft copolymerization reaction between L-lactide and the OOL afforded a copolymer that was compatible with PLA. The highest increase in elongation at break was 7.43% for the PLA blend films prepared with the OOLPC having a 5.0% loading of OOL; the tensile strength at this level of lignin loading was 12.03% lower. Introducing an OL into the blend films showed excellent ultraviolet absorption ability and thus the OOLPC could be used as a well-dispersed UV-blocking agent for biocompatible packaging materials.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 13
·51855
·
IF 3.125
Yifan Chen,Lei Ding,Chao Cui,Li Liu,Yudong Huang
The development of new bio-based epoxy resins and the search for new application areas have become important research directions for bio-based epoxy resins. Using protocatechuic acid (PA) as a bio-based raw material, brominated alkenes with different chain length were introduced into PA through substitution reaction, and then oxidized to obtain epoxy resins (PA-EP) with different epoxy values. After that, it was introduced into epoxy resin (diglycidyl ether bisphenol A [DGEBA]) sizing agent to replace part of DGEBA to prepare new sizing agents. Sizing amount test and sizing CF surface morphology show that the introduction of PA-EP with high-epoxy value made it easier be adhered to carbon fiber (CF) surface during sizing process. Interfacial shear strength and interlaminar shear strength of composite made of sizing CF (20 wt% PA-EP-3) were 56.86% and 30.29% improvement against the bare CF, which was attributed to the increase in surface energy and epoxy groups after CF sizing. Therefore, PA-EP with high-epoxy value was applied as sizing agent for improving interface performance of CF for the first time, and this application was less affected by its low-output problem compared to its application as a matrix resin in the field of composite manufacturing.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 12
·51815
·
IF 3.125
Onome Ejeromedoghene,Yi Ping Hu,Olayinka Oderinde,Fang Yao,Caroline Akinremi,Richard Akinyeye,Sheriff Adewuyi,Guodong Fu
There have been numerous challenges in the incorporation of photochromic materials into hydrogel system due to the agglomeration of nanoparticles and non-transparency of the hydrogel material. In this study, WO 3 nanocomposites were prepared and incorporated into poly(hydroxyethyl acrylate) (pHEA) and polyacrylamide (pAAm) to fabricate poly(HEA-AAm)/WO 3 hydrogels with improved coloration efficiency and reversibility. The as-prepared p(HEA-AAm)/WO 3 hydrogel displayed remarkable mechanical properties to sustain compressive and tensile stress up to 15.9 and 58.7 MPa with deformation ratios of 16.2 and 30.8, respectively. The hydrogels exhibited good transmittance (%T) and reflectance (%R) of ~47% and 64% at 829 and 408 nm respectively. The hydrogels also revealed visible spectroscopic absorbance at >781 nm after exposure to UV-lamp and natural sunlight for 5 s and 0.5 h, giving rise to a blue coloration, however, the fading process of the hydrogels was achieved in 20 min and 2.0 h respectively in an open air. More so, the hydrogel solutions displayed a high antibacterial efficacy against bacteria pathogens associated with bacterial keratitis in contact lens care solutions. The observed excellent photochromic and antibacterial properties of the hydrogel show promising potentials for use in the construction of antibacterial contact lenses, optical and intelligent devices.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 12
·51810
·
IF 3.125
Songling Chen,Yanyu Han,Chunyu Chen,Hongdou Liu,Hongtao Zou
Nearly 100 million tons of spent mushroom substrates (SMS) are discarded annually in China, which causes a series of environmental pollutants. To improve the nitrogen (N) use efficiency of and to shift dependence away from petroleum-based products, a novel bio-based epoxy coated urea was successfully developed. The bio-based epoxy coating was synthesized from the liquefied SMS and bisphenol-A diglycidyl ether. Subsequently, both nano-SiO 2 and organosilicon were employed to modify the bio-based epoxy and increase its hydrophobicity. Water absorption, ammonium adsorption, and water contact angles of the bio-based epoxy coatings were investigated. The nutrient release behaviors of the bio-based epoxy coated urea in water were also investigated and the modification mechanisms were explored by Fourier transform infrared, scanning electron microscopy–energy-dispersive X-ray spectroscopy and thermogravimetric analysis. The results revealed that the hydrophobic ability of the nano-SiO 2 and organosilicon dual modified bio-based epoxy coated urea coating was significantly enhanced and that its nutrient release longevity was increased to 56 days. Therefore, this work demonstrated that bio-based epoxy coated urea with superior release characteristics exhibited great potential in modern agricultural applications.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·
IF 3
Kun Wang,Wei Li,Ying Yu,Hui Li
In this study, dopamine hydrochloride was grafted onto the sulfated carboxymethylcellulose sodium with different sulfated degree (DA-g-SCMC S ) as heparin-like polysaccharides. By studying the preliminary structure and coagulation time of DA-g-SCMC S , the DA-g-SCMC2 possessing good anticoagulant properties were selected to be assembled layer by layer on the surface of aminated poly (L-lactic acid) (APLLA) film with chitosan (CS). The characterization properties including morphologies and wettability of DA-g-SCMC2/CS multilayers modified APLLA films were studied by scanning electron microscope and water contact angle instrument. Anticoagulation tests revealed that the (DA-g-SCMC2/CS) 15 multilayers modified APLLA film experienced a decrease of 37.5% and 73.68% in the adsorption of bovine serum albumin (BSA) and fibrinogen (FBG), respectively. And the platelet adhesion ability was reduced by 92.42% compared with the APLLA film. The degree of platelet activation (PF4 and TAT) and hemolysis rates of modified APLLA films also decreased significantly. Besides, the modified APLLA films promoted the growth of L929 cells and exhibited remarkable anti-inflammatory and antibacterial abilities. To summarize, the APLLA films modified with heparin-like multifunctional DA-g-SCMC2/CS multilayers exhibit outstanding biocompatibility, cytocompatibility, anti-inflammatory, and antibacterial characteristics, showcasing their potential as anticoagulation materials.
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高影响因子
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