JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 26
·46435
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IF 1.901
Wenqing Zhang,Baoqing Shentu,Zhixue Weng
Heat and ultraviolet (UV)-induced bonding and debonding (BDB) adhesives were designed and prepared through blending an epoxy resin, diglycidyl ether of bisphenol A (DGEBA) with an epoxy acrylate resin, bisphenol-A epoxy acrylate resin (BEA). The variation of the chemical structure of DGEBA and BEA in the sequential heat- and UV-curing processes was characterized by Fourier transform infrared spectroscopy (FTIR). The FTIR results indicate that DGEBA and BEA successfully took part in both the heat-curing and UV-curing processes. The effects of the mass ratio of BEA to DGEBA, amount of heat-curing agent, type of diluents, and UV irradiation time on the BDB properties of BDB adhesive were systematically investigated. The results show that the bonding strength increases with the decrease of the mass ratio of BEA to DGEBA and with the increase of the amount of heat-curing agent in a certain range. The debonding strength decreases with the increase of the mass ratio of BEA to DGEBA. The mass ratio of BEA to DGEBA was set at 10 to ensure the ratio of the bonding strength to debonding strength greater than 10 times. The debonding strength of BDB adhesives also depends on the UV irradiation time, decreasing with the increase of UV irradiation time in a certain range. Based on the FTIR results and the dependence of the bonding and deboning strengths on the reaction conditions, a possible BDB mechanism of BDB adhesive was proposed. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46435.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 17
·46203
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IF 1.901
Weidong Ai,Bing Xue,Cundi Wei,Kuizhou Dou,Shiding Miao
Coal gasification fine slag (CGFS) was processed via a grading technique. The CGFS products (CGFS-S1, CGFS-S2, CGFS-S3) with different sizes were obtained. Effects of particle size and unburned carbon on tensile properties of filled low density polyethylene (LDPE) were studied within the CGFS weight fractions ranging from 10 to 50 wt %. The tensile strength was found to increase with decreasing CGFS size, and the tensile properties exhibited good performance, owing to unburned carbon. The tensile strength of the composites increased with increasing CGFS-S3 weight fraction. The analysis of mathematical model and SEM revealed that the firm improvement of tensile strength resulted from the strong interactions between LDPE polymer chains and CGFS-S3 particles, and good dispersion of CGFS-S3 in resin. Thermogravimetric analysis proved obvious reinforcement in thermal-oxidative stability by incorporation of CGFS-S3. The degree of crystallinity of LDPE/CGFS-S3 showed the first increased and then decreased variation tendency. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46203.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 17
·46159
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IF 1.901
Sheng Xu,Liang Shen,Cailian Li,Yan Wang
In this work, three dianhydrides with similar chemical structures, 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA), 4,4′-oxydiphthalic anhydride (ODPA), and pyromellitic dianhydride (PMDA), are employed for the crosslinking modification of poly(vinyl alcohol) (PVA) membranes for ethanol dehydration via pervaporation. The changes in crosslinking degree, surface hydrophilicity, and glass-transition temperature are investigated and compared. Compared to the pure PVA membrane, all crosslinked membranes show higher fluxes but lower separation factors, because of the higher fractional free volume and the lower hydrophilicity by the crosslinking of the PVA matrix, respectively. In addition, all crosslinked PVA membranes exhibit similar flux, and the separation factor presents a decreasing order of PVA/PMDA-2 > PVA/ODPA-2 > PVA/BTDA-2, which is in the reverse order of their hydrophilicity, probably because of the reduction in the swelling resistance. With the PMDA content increasing from 0.01 to 0.04 mol/(kg PVA) in the PVA/PMDA crosslinked membranes, the crosslinking degree is enhanced and the hydrogen bonding is weakened, resulting in a flux increase from 120.2 to 190.8 g m −2 h −1 , but the separation factor declines from 306 to 58. This work is believed to provide useful insight on the chemical modification of PVA membranes for pervaporation and other membrane-based separation applications. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46159.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 17
·46143
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IF 1.901
Sui Wang,Zheng Zhang,Bing Chen,Jia Shao,Zhiyong Guo
Supramolecular hydrogel is a fascinating polymeric material composed of three-dimensional noncovalent networks with many outstanding properties, especially reversible relevant performances. A self-healing supramolecular hydrogel of poly(vinyl alcohol)/graphite oxide, with reversible pH responsiveness and good thermal stability, was prepared. The morphology, functional group changes, swelling performance, thermal stability, rheological performance, and self-healing property of the PVA/GO hydrogel were investigated. A probable mechanism between the components and potential applications were also examined in our study. The experimental results show that the PVA/GO hydrogel was not only self-healable without external stimulus or addition of any healing agents, but also pH sensitive and with good thermal stability. Green ingredients (PVA and GO) and a simple synthesis method (a freezing/thawing treatment) may pose little threat to the environment and also promote the production of such hydrogels. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46143.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 18
·46210
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IF 1.901
Xiaopeng Yue,Jian Li,Pengjie Liu,Yicun Lin,Xin Du
Esterified starch was used as an interfacial modifier to treat the surface of cassava dregs. The treated fiber was used to prepare flame-retardant poly(butylene succinate) (PBS)/cassava dregs fiber composites with the incorporation of intumescent flame retardants (IFR). The mechanical performance and flame-retardant properties of composites were investigated. Experimental data showed that an appropriate cassava fiber loading favored the mechanical performance of composites. When the total filler content was 30 wt % [ m (cassava dregs): m (IFR) = 1:5], in comparison with those of composite prepared by 30 wt % IFR, the tensile and impact strengths of composite increased by 40 ± 7 and 62 ± 8%, respectively. Besides, the limited oxygen index value of 37.3% and UL-94 V0 rate of composite could be achieved. Possible flame retardant mechanism was proposed. The combusted residue of incorporated cassava dregs could play a support effect in the three-dimensional charred layer formed by the combustion products of IFR and PBS. The three-dimensional intumescent charred layer, and the formation of incombustible gas, such as NH3, play an important role in insulation, oxygen barrier, thereby effectively improving the flame retardancy and thermal stability of composites. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46210.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 135
·期 15
·46127
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IF 1.86
Hongxia Liu,Changbing Zhou,Xinyue Liu,Yang Xu,Simin Geng,Yunhua Chen,Chun Wei,Chuanbai Yu
We demonstrate a facile route to prepare novel composite microspheres based on Pickering emulsion template stabilized by cellulose nanocrystals prepared from sisal fiber (SCNCs). The oil phase of the Pickering emulsions contains hydrophobic drug curcumin and poly(methyl methacrylate) (PMMA). Curcumin loaded PMMA composite microspheres coated by SCNCs (Cur-loaded PMMA@SCNC CMs) were obtained after the evaporation of dichloromethane. The structure and morphology of CMs were characterized by polarized optical microscope (POM), confocal laser scanning microscope, scanning electric microscope, and Fourier transform infrared spectroscopy. The stability and release kinetics of curcumin were evaluated based on spectrophotometric measurements. Overall, these results show that Cur-loaded PMMA@SCNC CMs display long-term photostability and good encapsulating ability for curcumin. This work offers an effective route of preparing new functional microsphere for the delivery of bioactive compounds. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46127.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 23
·46363
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IF 1.901
Yongli Sun,Weiguang Jin,Luhong Zhang,Na Zhang,Baoyu Wang,Bin Jiang
Thin film composite nanofiltration membranes are frequently used to remove the residual salts from industrial wastewater. However, these nanofiltration membranes often have relatively low fluxes that limit their practical applications. To solve the problem, sodium bicarbonate was introduced into the composite nanofiltration membranes via interfacial polymerization of piperazine (PIP) and 1,3,5-benzenetricarbonyl trichloride (TMC). The membrane surfaces were characterized by scanning electronic microscopy, attenuated total reflection Fourier transform infrared spectroscopy, electro kinetic analyzer, and contact angle goniometer. The results showed that the addition of sodium bicarbonate generated more tiny cracks on membrane surface and decreased the zeta potential of the membrane, which improved the permeation properties of the membrane without significantly decreasing the rejection against four kinds of salts (Na 2 SO 4 , MgSO 4 , NaCl, MgCl 2 ). The addition of sodium bicarbonate provided a new possibility to improve the permeation properties of thin film composite nanofiltration membranes. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46363.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 23
·46354
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IF 1.901
Bing Chen,Tingting Li,Zheng Zhang,Sui Wang,Zhiyong Guo,Yufang Hu
A promising strategy to design crosslinked photoluminescent hydrogel (PL hydrogel) is to synthesize the covalently bonded polymer chains by thermal polymerization. A proper ratio of methacrylic acid and m -phenylenediamine was used to prepare the PL hydrogel, and doping with graphene oxide and carboxymethyl chitosan improves the structure of the gel. The green and efficient hydrothermal synthesis realized a high polymerization and a short reaction time. Meanwhile, a series of properties were investigated for several combinations of hydrogels. Ultraviolet spectra, fluorescence spectra, and particle size distributions were used to characterize the PL composites. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, rheological studies, and stress–strain tests were conducted to characterize the morphology, structure, and performance of the compound hydrogel. The adsorption properties of the PL hydrogel were characterized in adsorption tests. The results indicated that the PL hydrogel exhibited a favorable luminescence property, a certain degree of mechanical strength, and good adsorption performance. The prepared PL hydrogel has potential applications in adsorption and visual detection. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46354.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 23
·46351
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IF 1.901
Li Wen,Liwen Wang,Shuyi Fang,Lei Bao,Dongdong Hu,Yuan Zong,Ling Zhao,Tao Liu
Two newly-designed hydrocarbon surfactants, that is, poly(vinyl acetate)- block -poly(1-vinyl-2-pyrrolidone) (PVAc- b -PVP) and PVP- b -PVAc- b -PVP, were synthesized using reversible addition–fragmentation chain transfer polymerization and used to form CO 2 /water (C/W) emulsions with high internal phase volume and good stability against flocculation and coalescence up to 60 h. Their structures were precisely determined by nuclear magnetic resonance, gel permeation chromatography, thermal gravimetric analysis, and differential scanning calorimetry. Besides low temperature and high CO 2 pressure, the surfactant structures were the key factors affecting the formation and stability of high internal phase C/W emulsions, including the polymerization degrees of CO 2 -philic block (PVAc) and hydrophilic block (PVP), as well as the number of hydrophilic tail. The surface tension of the surfactant aqueous solution and the apparent viscosity of the C/W emulsions were also measured to characterize the surfactants efficiency and effectiveness. The surfactants with double hydrophilic tails showed stronger emulsifying ability than those with single hydrophilic tail. The great enhancement of the emulsions stability was due to decrease of the interface tension as well as increase of the steric hindrance in the water lamellae, preventing a frequent collision of CO 2 droplets and their fast coalescence. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46351.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 25
·46206
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IF 1.901
Yawen Huang,Yu Yang,Jiajun Ma,Junxiao Yang
Fe- and P-based compounds have demonstrated promising performance in enhancing flame retardancy of epoxy resins. In this context, this work focuses on the preparation of new Fe/P hybridized nanomaterials and their effect on flame retardancy of epoxy resins. The Fe/P hybrids were facilely prepared via forming ferric phosphinates and phosphonates using hydrothermal reaction. Attractively, ferric phosphinates and phosphonates exhibit the morphology of 1D nanorod and 2D nanosheet, respectively. When incorporating these two fillers in epoxy resin, the limiting oxygen index values of composites were enhanced to above 28 and the composites exhibited self-extinguishing behavior, thus indicating greatly improved fire resistance. Further investigation revealed that the flame retarding behavior, in particular for ferric phosphonate nanosheets, took place mainly in gas phases via delaying the release of flammable gas. Attractively, it was found that the Fe/P hybrids took part into the pyrolysis reaction of epoxy resins through forming Fe O and P O bonds. This finding may provide a new insight to design a series of high performance flame retardants for epoxy resins. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46206.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 23
·46342
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IF 1.901
Meng-Nan Liu,Xu Yan,Ming-Hao You,Jie Fu,Guang-Di Nie,Miao Yu,Xin Ning,Yong Wan,Yun-Ze Long
Electrospun nanofibrous membranes (NFMs) with outstanding photochromic property, waterproof, and breathability have attracted considerable interest owing to their multifunctional applications in intelligent clothing, self-cleaning, and protection. However, great challenges still remain in creating such functional materials. A novel waterproof–breathable membrane with robust photochromic property is fabricated by introducing photochromic microcapsule (PM) into electrospun thermoplastic polyurethanes (TPU) membranes. Compared with the pristine TPU NFMs, the composite TPU/PM membranes are endowed with reversible photochromic properties. In addition, the composite membranes not only exhibited a water contact angle of 137° and a milk contact angle of 130°, but also had integrated properties of modest water vapor transmittance rate of 19,278 g m −2 day −1 , high air permeability of 962 mm s −1 , low waterproofness of 2.813 kPa, and comparable tensile strength of 12.08 MPa. Furthermore, the convenience and efficiency of this fabrication process will allow for large-scale production of the multifunctional NFMs. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46342.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2018
·Vol. 135
·期 21
·46302
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IF 1.901
Wenqi Wang,Jie Ying,Jikui Wang
In this article, a novel method has been successfully developed to prepare the anionic polyamide 6/polystyrene (APA6/PS) blends. The macroactivator P(St- co -IEM) was synthesized by the free radical polymerization of 2-isocyanatoethyl methacrylate and styrene (St), then the graft copolymer of PS and APA6 (PS- g -APA6) can be obtained by the anionic polymerization of ɛ-caprolactam activated by the macroactivator P(St- co -IEM). The X-ray diffraction analysis, differential scanning calorimetry, scanning electron microscopy analysis, contact angle measurement, water absorption measurement, molau test, thermogravimetric analysis, and mechanical properties test were performed separately to study the effects of P(St- co -IEM) on crystallinity, morphology, water resistance, thermal stability, and mechanical properties. The results indicate the synthesis of macroactivator can promote the formation of the γ-phase. Moreover, it can improve the interfacial compatibility, water resistance, thermal stability, and toughness. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46302.
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高影响因子
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