JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 19
·52137
·
IF 3.057
Chenwei Li,Dujuan Hu,Ling Liu,Li Zhu,Man Xu,Cunwen Wang,Yanbo Li
Polyethylenimine (PEI) is a water-soluble polymer with higher density of cations and strong adsorbability. In the present work, loose nanofiltration membranes based on PEI were prepared by surface deposition of PEI on hydrolyzed polyacrylonitrile (PANH) supports through a surface crosslink method without using extra crosslinkers. The thinner selective layer (around 50 nm) of polyelectrolyte complex was formed through the crosslinks (ionic and co-valent) between amine groups in PEI and carboxyl groups in PANH. The PEI/PAN membranes were characterized by SEM, ATR-IR, and XPS. Nanofiltration of PEGs and salt solutions were performed to evaluate the membrane performance. Loose nanofiltration membranes, with molecular weight cut-off from 500 to 950 Da, permeances form 7 to 16 L m −2 h −1 bar −1 , were obtained by the simple surface crosslink method. The membrane performance can be facile tailored by controlling the deposition parameters, including deposition time and post-treatments.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 19
·52127
·
IF 3.057
Zheng-Qing Huang,Wei Cai,Zhi Zhang
In order to improve the hydropilicity, polysulfone was first modified by grafting diethanolamine and further made into the ultrafiltration membranes by a phase inversion process. Ultrafiltration membranes were characterized by nuclear magnetic resonance spectrum, contact angle, thermogravimetric analysis, differential scanning calorimetry, scanning electron microscopy, adsorption, and ultrafiltration experiments. The ultrafiltration membrane containing tertiary amine groups had a 99.2% rejection to bovine serum albumin (BSA), 235.2 L m −2 h −1 pure water flux and 78.6% flux recovery rate. Usually, the ultrafiltration membrane containing tertiary amine groups has a low rejection and a poor adsorptive ability to Cr(VI) in the neutral condition. A novel strategy of acidification in advance was adopted to adjust the separation performance of the polysulfone ultrafiltration membrane containing tertiary amine groups. The pre-acidification strategy could improve the Cr(VI) rejection from below 10% to 100% in the neutral condition, since ultrafiltration membranes acidified in advance did not lose its H + in storage. Moreover, the acidification could improve the glass transition temperature and only caused a slight decrease of water flux and BSA rejection.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52205
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IF 3.057
Qian Wang,Peizhuang Wang,Lvheng Kou,Hongyuan Wei,Jiang Zhou
Transparent underwater superoleophobic coatings were prepared by blending chitin nanofibers (ChNFs) and polyvinyl alcohol (PVA) and then cross-linked with glutaraldehyde (GA). The interactions among ChNFs, PVA, and GA in the coatings were analyzed via FT-IR and XPS. Results of SEM observation and AFM analysis showed that higher concentrations of ChNFs and GA gave rise to rougher surface and lower transmittance of the coatings. By adjusting ratios of ChNFs, PVA, and GA, the coating surface could possess underwater superoleophobicity with oil (1, 2-dichloroethane) contact angle up to 159.2° and slide angle ~3°, meanwhile, transmittance of the coatings in the wavelength range of 400–800 nm could be maintained between 40% and 90%. This work provides a new route to prepare environmentally friendly transparent underwater superoleophobic coatings.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 20
·52148
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IF 3.057
Juan Li,Guijing Chen,Shanshan Luo,Huixia Pang,Chengtao Gao,Shaowen Huang,Shan Liu,Shuhao Qin
In this study, styrene-maleic anhydride copolymer/chlorinated polyvinyl chloride composite membranes were prepared via a non-solvent induced phase separation technique. Different porous morphologies of the composite membranes were obtained by controlling the temperature of coagulation bath water. With the coagulation bath temperature increasing, the porous morphology of membrane surface changed from co-continuous pores to isolated-round-pores, and its evolution mechanism was elaborated. The average pore size of membranes surface increased from 17.27 to 48.72 nm, the pure water flux increased from 225.50 to 624.47 L m −2 h −1 , and the rejection rate of Congo red and bovine serum albumin declined gradually with the increase of coagulation bath temperature, but the NaCl rejection was less than 1.0%. The surface segregation behavior of anhydride groups was affected by the phase separation process, which in turn affects the anti-fouling performance of membranes. The composite membranes obtained at the coagulation bath temperature of 20 and 30°C had large surface segregation of anhydride groups and excellent anti-fouling performance. The water flux recovery rate is higher than 90% and the irreversible pollution decline rate is about 5.0%. Meanwhile, the obtained membranes, especially the membrane fabricated at a coagulation bath temperature of 0°C, has good dye/NaCl salt separation performance and can be used for the pretreatment of textile wastewater.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 20
·52161
·
IF 3.057
Diqin Zhang,Yu Zhao,Zhen Zhang,Bin Guo,Jianhua Zhu,Yan Ye,Yuxia Zhao
Host matrices play an important role in the volume holographic gratings formation of photopolymers. In this study, a series of fluorinated epoxy resin (FTGE) with low refractive index (1.44–1.46) are synthesized and characterized by nuclear magnetic resonance spectra ( 1 H NMR, 19 F NMR) and fourier transform infrared spectra (FTIR). Fluorinated epoxy-amine cross-linked matrices are formed at room temperature and their thermal polymerization properties are investigated through real-time FTIR and thermogravimetric analyses (TGA). Using the fluorinated epoxy-amine as host matrices, holographic photopolymers are fabricated. The influence of different kinds (Prop-FTGE, Buta-FTGE, and Penta-FTGE) and weight ratios (0%, 8%, 16%, and 23%) of FTGEs on holographic performances of the photopolymers are explored. The results show that the sample with 23% Prop-FTGE has the most excellent holographic optical characteristics. 0.5 mm thick sample with 23% Prop-FTGE reaches 91% diffraction efficiency within 80 mJ/cm 2 exposure dosage, and gets a 2000 lp/mm Bragg volume grating with 0.24° angular selectivity. Meanwhile, under a single pulse exposure mode (150–200 ps pulse width, 25 mJ/cm 2 exposure dosage), a grating with 4.4% diffraction efficiency is obtained, which proves the ultrafast response and recording capability of the sample.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 22
·52263
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IF 3.057
Jie Zhang,Zongwei Guo,Jinpeng Ma,Lingxiao Song,Guorui Yang,Yuhui Ao,Lei Shang,Ming Li
As an important thermosetting resin, epoxy resin (EP) is widely used in the field of composite materials. Long storage time, rapid curing and low viscosity of one-component EP is ideal for preparing composite materials by vacuum assisted resin transfer molding (VARTM). For this sake, we developed and synthesized a new imidazole thermal latent curing agent, 4,7-diimidazol-2,1,3-benzothiadiazole (BTD-MZ 2 ) with a yield of about 75%. The curing behavior, thermal stability and storage time of the prepared EP system was studied by differential scanning calorimeter (DSC), thermal gravimetric analyzer (TGA), modular compact rheometer (MCR), respectively. DSC results showed that EP/17.5 wt% BTD-MZ 2 had a good latent period at low temperature, and can rapidly cure EP when heated to 150°C. TGA results show that BTD-MZ 2 promoted the formation of carbon residue and the residual carbon rate of EP/17.5 wt% BTD-MZ 2 is as high as 37.9%. MCR results show that the storage time of EP/17.5 wt% BTD-MZ 2 at 60°C can reach 850 min. In addition, it could play a role of catalyst used as co-curing agents with aromatic amines for EP. DSC test showed that the addition of 5 wt% BTD-MZ 2 reduced the activation energy of EP/4,4′-diaminodiphenylmethane (DDM) and promoted the curing reaction.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2022
·Vol. 139
·期 22
·52267
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IF 3.057
Guo-Yan Ma,Cheng-Jun Wang,Chun-Bao Du,Xi Li,Xiao-Rong Wang
Novel polymeric surfactant (MBSP) is obtained with phosphate esters monomer (PEGMAP) as the functional monomer in the presence of other acrylic monomers. The synthesized MBSP is further used as emulsifier for preparing the corrosion-resistance polyacrylate coatings (PAMBSP). Attenuated total reflection Fourier transform infrared (ATR-FTIR) and nuclear magnetic resonance results show that phosphate esters functional monomer was introduced into the MBSP molecular chains. The surface tension measurements illustrated that with the PEGMAP content 1%, the lowest surface tension 44.45 mN/m and the equilibrium concentration critical micellar concentration (CMC) 1.02 g/L of MBSP are obtained. The stability analysis of the PAMBSP emulsions demonstrates that the Turbiscan Stability Index (TSI) value decreased from 0.64 to 0.32 with the PEGMAP content increased from 1% to 3%. The electrochemical analysis displays that with PEGMAP content 3%, the biggest corrosion potential −0.02 V, smallest etching current density 2.19 × 10 −9 A•cm 2 and biggest impedance modulus 1.46 × 10 7 Ω·cm 2 was obtained.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52209
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IF 3.057
Yong Guo,Zhongwei Chen,Yuan Yu,Tingting Chen,Qingwu Zhang,Changxin Li,Juncheng Jiang
A new-type flame retardant DEZ of bi-DOPO compound containing bi-hydroxy and two amino groups, was synthesized from terephthalonitrile, hydroxylamine hydrochloride, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and used with curing agent 4,4′-diamino-diphenylmethane to prepare flame retard epoxy resin (EP) composites. 1 H and 31 P nuclear magnetic resonance spectra and Fourier transform infrared spectra have determined the chemical structure of DEZ. The properties of cured EP composites were explicitly evaluated by differential scanning calorimeter, thermogravimetric analysis, the limiting oxygen index (LOI), vertical burning (UL-94) test, cone calorimetry test, and flexural test. The 1 wt% addition of DEZ could improve the EP composites by almost 14.4% of flexural strength and 29.6% of flexural modulus, respectively. The LOI of EP composites with 5 wt% of DEZ was 29.7% and EP composites reached a V-0 rating in the UL-94 test, as well as total heat release was decreased by 11.2%. All EP modified by DEZ exhibited a blow-out effect in the combustion process, which was due to the release of pyrolysis gases and incombustible gases containing phosphorus radicals and nitrogen compounds.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52210
·
IF 3.057
Huili Shi,Zhiwei Li,Xiaohong Li,Zhijun Zhang
Doping is a simple and effective method to change material properties. In this work, in order to improve the flame retardant performance of bismuth oxychloride (BiOCl) nanosheets in poly (vinyl chloride) (PVC), for the first time, iron and tin ions were doped into BiOCl (Fe-BiOCl and Sn-BiOCl) via a doping approach, respectively. X-ray diffraction and morphology characterization confirmed that the Fe and Sn ions were doped into the BiOCl lattices, respectively. After doping, PVC composites obtained superior flame retardancy and smoke suppression. With the adding amount of 3 wt% Fe-BiOCl and Sn-BiOCl, the UL-94 test rating of the PVC composites reached V-0, and the peak of heat release rate reduced by 38% and 34%, total smoke production decreased by 55% and 42%, respectively, compared to neat PVC. Thermogravimetric and Thermogravimetric-Fourier Transform Infrared results showed that Fe or Sn doping could further reduce organic volatiles in the gas-phase and improve char residual in the condensed phase, both of which contribute to reducing fire hazards. Tensile properties and tensile modulus of PVC composites increased. In short, it is an economically effective approach targeting to improve the comprehensive properties of PVC through doping Fe or Sn into BiOCl.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 23
·52287
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IF 3.057
Jinjing Wang,Yi Zhang,Jianfei Sun,Zhen Jiao
Multi-modal porous scaffolds can promote bone regeneration. In the present study, they were successfully fabricated from poly (lactic-co-glycolic acid) (PLGA)/superparamagnetic iron oxide nanoparticles (SPIONs) by supercritical CO 2 foaming, where SPIONs was employed as heterogeneous nucleation agent. The effects of SPION size on pore nucleation in PLGA/SPIONs nanocomposites were investigated. It was found that the addition of smaller SPIONs size caused the reduction of pore size. Multi-modal porous scaffolds could be available by controlling the SPIONs content, soaking temperature, pressure, and depressurization rate. The porosity of the PLGA/SPIONs scaffolds ranged from (58.68 ± 0.62)% to (94.97 ± 0.14)% could be obtained via adjusting the supercritical CO 2 foaming conditions. Moreover, it was found that the compressive modulus and porosity of the scaffolds were strongly associated with the porous structure. This study provided a new green preparation method for magnetic scaffolds to realize the controllable adjustment of the multi-mode porous scaffolds.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 22
·52268
·
IF 3.057
Zhixiang Cui,Yue Fan,Xiaolong Liu,Junhui Si,Qianting Wang
Nowadays, the environmental problems caused by industrial oily wastewater and offshore oil leakage are becoming more and more serious. Here, the 3-D porous polyurethane/deacetylated acetate cellulose (TPU/d-CA) composite foam with outstanding mechanical property and oil/water separation performance was successfully prepared. The morphology, wettability, mechanical properties, and oil/water separation performances had been systematically studied. The results showed that TPU/d-CA composite foam could be used as water and oil removing material, respectively, for a series of oil/water mixture only under gravity force, due to its lipophilicity and hydrophilicity. It has high-separation flux, which can reach up to 43,000 L/m 2 ·h and 85,000 L/m 2 ·h for water and oil, respectively and all the separation efficiency exceeds 98%. It also can be used as adsorbent material to absorb various oils, and the absorption capacity for carbon tetrachloride reached up to 34 g/g. Moreover, it can selectively, rapidly, and continuously separate oil or water by assisted peristaltic pump. After 15 cycle times, its separation efficiency is still as high as 98%. It has excellent comprehensive mechanical properties and antifouling ability. These results indicated that 3-D TPU/d-CA composite foam has broadly application prospects in oil/water separation field.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52228
·
IF 3.057
Xiyang Zeng,Li Wang,Xiaohu Chen,Kun Luo,Junfeng Li
Large bone defects due to accidental injuries and fractures as well as the mismatch between the implant material and the defect site are major problems in biomedicine. Bone tissue engineering offers a solution to this problem. In this paper, a series of three-dimensional porous composite scaffolds with shape memory were prepared using polycaprolactone and polytetrahydrofuran as soft segment materials, hexamethylene diisocyanate as hard segment materials and amorphous calcium phosphate/calcium citrate (CAP) as inorganic fillers. The scaffolds have tunable mechanical properties, melt temperature, surface wettability, a pore size range of 100–800 μm and a high degree of connectivity. In vitro mineralization showed good mineral deposition and energy dispersion spectrometer displayed uniform distribution of Ca and P elements on the surface. The composite scaffold exhibited good shape memory properties at 37°C. The shape fixation rate ( R f ) and shape recovery rate ( R r ) were maintained at 94.1% and 94.4% after five compression cycles. The resulting scaffold promoted MG63 cell proliferation to some extent. The scaffold is expected to be used clinically for the treatment of large bone defects.
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高影响因子
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