JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 33
·50911
·
IF 3.125
Yanqin Shi,Jiaqi Shen,Dieshuang Yang,Junnan Du,Songyan Lu,Meng Ma,Huiwen He,Si Chen,Xu Wang
The green cinnamaldehyde (CA) and thymol (THY) separately or successively modified O-ZnO (O-ZnO-CA, O-ZnO-THY, and O-ZnO-CA-THY) were prepared after (3-aminopropyl) triethoxysilane (KH550) was grafted to the surface of ZnO (O-ZnO) and characterized by FTIR, TGA, and SEM. Polypropylene composites (PP/O-ZnO-CA, PP/O-ZnO-THY, and PP/O-ZnO-CA-THY) were prepared by melting the modified O-ZnO and PP. The antibacterial tests showed that the antibacterial rate of PP/O-ZnO-CA and PP/O-ZnO-THY against S. aureus and E. coli was obviously enhanced. It indicated an excellent synergetic antibacterial effect of O-ZnO and the little CA or THY grafted on the surface of O-ZnO. The antibacterial effect of O-ZnO-CA and O-ZnO-THY was related to the hydrophobic and hydrophilic groups contained in CA and THY. Importantly, CA and THY in O-ZnO-CA-THY exhibited another excellent synergetic antibacterial effect against both S. aureus and E. coli . The antibacterial rate of three PP composites containing 4 phr O-ZnO-CA-THY against S. aureus and E. coli reached 95% and 90%, respectively. The mechanism was regarded as that CA and THY grafted onto the same O-ZnO improved the contact probability between antibacterial agents and bacteria. Moreover, O-ZnO-CA, O-ZnO-THY, and O-ZnO-CA-THY had excellent migration resistance in the PP matrix.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 37
·50950
·
IF 3.125
Zhiquan Chen,Yang Li,Lei Ni,Juncheng Jiang,Yuan Yu,Qiang Chen
To develop the functional particles with better flame-retardant and compatibility with epoxy resin (EP) matrix, organic–inorganic double-shell microencapsulated aluminum hypophosphite (MSiAHP) was prepared by situ polymerization. The water contact angles of MSiAHP (62.4°) is significantly larger than that of aluminum hypophosphite (34.4°), which shows that the organic shell material of MSiAHP endows excellent hydrophobicity and water resistance. With the incorporation of MSiAHP, EP/30%MSiAHP composite exhibits limiting oxygen index value of 27.3% and V-0 rating. Furthermore, the cone calorimetry test reveals that MSiAHP reduces the peak heat release rate, total heat release and total smoke release of EP matrix by 33.3%, 24.4% and 56.6%, respectively. Besides, due to the unique organic–inorganic double-shell structure of MSiAHP particles, EP/30%MSiAHP composite achieves greater thermal stability and higher char yields than pure EP. The investigation of the products in the gas and condensed phase demonstrates that MSiAHP is beneficial to the generation of a high-density and compact carbon layer structure with a high graphitization degree, and delay the generation time of pyrolysis products in the gas phase, which can improve the fire safety of EP composites effectively. Furthermore, preeminent dispersion and compatibility of MSiAHP lead to EP/MSiAHP composites with excellent mechanical properties.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 32
·50777
·
IF 3.125
Junji Zhao,Xueyan Qiu,Xiaomei Liu,Xie Ye,Hongran Xiong,Yan Liang,Ziqiang Lei
In this study, the application of superabsorbent resin (SAP) in inhibiting the soil moisture evaporation (or slowing down the water outflow) was studied. The clay-SAP composites were fabricated by grafting of poly (acrylic acid-N-hydroxymethyl acrylamide/clay) (GT-g-P [AA-co-NHA]/clay) on Tragacanth gum (GT), using solution polymerization. The structure, morphology and stability of the clay-SAP composites were investigated by Fourier transform infrared, scanning electron microscope and TGA. The maximum swelling ratio of Attapulgite (3%)-, Kaolin (3%)- and Montmorillonite (3%)-SAP composite in deionized water reached 1180, 819 and 525 g/g respectively, and the maximum swelling ratio in tap water reached up to 206, 192 and 170 g/g respectively. Meanwhile, the maximum swelling ratio in 0.9% NaCl solution was 95, 82 and 62 g/g respectively. The water retention of clay-SAP composites was also analyzed as a function of temperature. In addition, by simulating the desertification area, the effect of the APT (3%)-SAP composite on the anti-evaporation performance was studied. The obtained results revealed that the water retention of APT (3%)-SAP composite was 36% at 45°C for 12 h. Under natural conditions, the evaporation rate of the anti-evaporation material was inversely proportional to the amount of APT (3%)-SAP composite added.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 11
·51779
·
IF 3.125
Yue Yin,Linghui Meng
In the present study, an investigation was conducted on the effects of polyhedral oligomeric silsesquioxane (POSS) on the mechanical, morphological, and thermal properties of PET-based nanocomposites. When the epoxy groups reacted with the PET end groups, the transesterification catalyst zinc acetylacetonate was introduced to facilitate the reaction between PET matrix and EPOSS. As clearly observed in the SEM image, 3 wt% POSS was added to PET matrix, the size of POSS particles was lower than 50 nm. As revealed from the EDX spectrum, the silicon signal was located in the EPOSS agglomerated particles and exhibited an even distribution in the entire PET matrix, which demonstrated a unique dispersion. Furthermore, it was reported that EPOSS exhibited nucleating agent performance, which suggested the higher temperature for melting crystallization (Up to 205.6°C while neat PET only reached 194.3°C). On the whole, EPOSS was revealed to act as a nucleating agent, whereas it could significantly facilitate the crystallization of PET by expediting the nucleation. Moreover, it could, to a certain extent, improve the mechanical properties of PET. These findings were attributable to the fact that PET and EPOSS exert a more comprehensive interface effect and a higher dispersion effect through the transesterification reaction.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 11
·51790
·
IF 3.125
Yu Cao,Yanjie Wu,Xin Tang,Qi Zhou,Siegfried Stapf,Carlos Mattea,Wei Li
The weakly entangled ultrahigh molecular weight polyethylene (UHMWPE) was synthesized by a Ziegler-Natta catalyst, where the titanium tetrachloride was anchored on the polystyrene (PS)-modified silica. The PS chains were successfully incorporated into silica hierarchical pores even with the size less than 10 nm through the in situ free-radical polymerization of styrene. The self-diffusion coefficient and crystallization of probing molecules inside the pores were investigated by the pulsed field gradient NMR and thermoporosimetry to address the swollen behavior of incorporated PS blocks. This PS blocks compartmentalized the polyethylene chains, where the less entangled UHMWPE was synthesized with an exceptional activity at 70°C. The ubiquitous PS isolators effectively hindered the formation of chains overlaps during the polymerization, showing a long-term efficiency to reduce the entanglements of nascent UHMWPE even at 4 h of polymerization The toughness/stiffness/strength balance of weakly entangled UHMWPE was significantly improved.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 9
·51729
·
IF 3.125
Yan Zhang,Bin Chen,Haichao Zhao,Lijing Zhu
Mussel-inspired dopamine (DA) surface modification has been widely recognized as a promoting strategy to design and exploit valuable multifunctional materials. Herein, polysulfone porous membrane was modified by the co-deposition of DA and sodium polystyrene sulfonate. In the case of extended duration of the reaction time, the water contact angle of the membrane decreased by 30 ° and the color of the modified membrane presented dark. The rejection rates of bovine serum albumin and lysozyme can close to 100% of the modified membrane and the bacteriostatic rate reached 100% at 18 h. In addition, the co-deposited membrane performed well bactericidal and excellent antiadhesion to Escherichia coli . This work provides a simple way for the fabrication of an antibacterial surface.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 9
·51724
·
IF 3.125
Xiaoqing Qiu,Daqian Wang,Qing Li,Xiaoyue Li,Xiaowei Zhao,Zhiwei Li,Xiaohong Li,Zhijun Zhang
Melamine-formaldehyde (MF) foam has wide applications due to good flame retardancy, excellent sound absorption, and high thermal stability. However, the recycling of MF foam wastes remains a challenge due to its thermosetting nature. Here, we demonstrate a new strategy for discarded foams as solid adsorbents for removing tin ions in simulated tin-containing wastewater. Results showed that the removal rate of tin in simulated wastewater is as high as 99.996%. Moreover, after simple calcination, as-obtained products can be used as high-efficiency flame retardants for flexible poly(vinyl chloride) (PVC), reducing the peak of heat release rate and total smoke production of PVC by 51.8% and 45.8%, respectively, under the condition of 2.5 wt.% addition. In short, this strategy successfully converted MF foam and tin wastewater to valuable flame retardants, opening the way for the environmentally friendly recycling of MF waste and the simultaneous treatment of tin-containing wastewater.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 8
·51688
·
IF 3.125
Qibin Xu,Shengchang Zhang,Zexi Su,Dazhe Li,Shuheng Liang,Bo Li,Tingting Lian,Xiangpu Qin,Mengjin Jiang,Pengqing Liu
9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and DOPO derivatives had always been regarded as main candidates for improving the flame retardancy of epoxy resin (EP). In this paper, a novel reactive flame retardant DOPOMAH was synthesized from the reaction between DOPO and cis-butenedioic anhydride (MAH), thereafter acted as a co-curing agent for EP to remarkably improve the flame retardancy of matrix. The effects of DOPOMAH and DOPO on comprehensive performance of EP were systematically investigated and compared through dynamic mechanical analysis, mechanical performance testing, limiting oxygen index (LOI), vertical burning (UL-94), and cone calorimetry test. These results indicated that the excellent dispersion of DOPOMAH in EP makes the EP modified by DOPOMAH has good mechanical properties. When the content of phosphorus is 2.0 wt%, compared with the EP modified by DOPO (ED), the LOI of the EP modified by DOPOMAH (EDM) increased from 30.6% to 32.8%, and the UL-94 was also improved from no rating to V-0. Meanwhile, the peak heat release rate of EDM was only 51% of that of pure EP, which was slightly less than that of ED. Finally, a flame-retardant mechanism comparison between DOPOMAH and DOPO was discussed in detail to reveal the reasons why the flame reatardant effect of DOPOMAH was better than that of DOPO.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 40
·51184
·
IF 3.125
Siyuan Jiang,Yufei Liu,Xiaoyu Zou,Min He,Kai Zhang,Guomin Xu,Shuhao Qin
The two macromolecular antioxidants, P(3,5-di-tert-butyl-4-hydroxy cinnamic acid-alt-N-phenylmaleimide) (PCN) and P(3-butene-1-yl-3,5-di-tert-butyl −4-hydroxyphenyl propionate-alt-N-phenylmaleimide) (PPN) were designed and synthesized via free radical copolymerization. The structures of the resulting PCN and PPN antioxidants were characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy ( 1 H NMR), and gel permeation chromatography. In addition, the effect of the two macromolecular antioxidants on the thermal oxidation aging resistance of polyamide 6 (PA6) was studied. According to the analysis of differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical analysis, dynamic viscosity, and the mechanical property of PA6 and its blends, these two types of macromolecular antioxidants protected the molecular chain of PA6 from breaking, protected the crystallization of PA6 and maintained the stability of PA6 crystal form, improved the activation energy of thermal degradation and thermal stability of PA6, enhanced the strength and elasticity of PA6 and maintained the mechanical properties of PA6 during aging to a certain extent.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 40
·51171
·
IF 3.125
Xiuju Lin,Hao Pang,Daidong Wei,Bing Liao
Herein, crosslinked polycarboxylate superplasticizers were synthesized using acrylic acid, sodium methylallyl sulfonate and methyl polyethylene glycol acrylate as monomers, and monomers that contain either ester or amide groups as crosslinking agents. The superplasticizers that were synthesized from the ester- and amide-based crosslinking agents were respectively denoted as SP-E and SP-N. In addition, a series of performance characterizations were carried out to explore the influence of different functional groups in crosslinking agents on the performance of superplasticizers. Fluidity test results showed that the dispersibility and fluidity retention of cement pastes treated with the SP-E were better than those of cement pastes treated with SP-N. Meanwhile, the viscosity of the sample containing SP-E was lower than that containing SP-N. In addition, the amount of the two superplasticizers that had become adsorbed onto the surfaces of cement particles also differed, and in this case the adsorption capacity of SP-E was greater than that of SP-N. X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy tests showed that the ester-group based SP-E superplasticizers promoted cement hydration to a greater degree than that was achieved with their amide-bearing SP-N counterparts. This study would provide valuable insight for the development of crosslinked polycarboxylate superplasticizers.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 40
·51172
·
IF 3.125
Qiuye Zhang,Jingjing Wang,Luen Xu,Shi-Yu Lu,Huawei Yang,Yifan Duan,Qiang Yang,Mengfan Qiu,Chunmei Chen,Sheng Zhao,Xiaohong Liu,Hui Liu
Photothermal-enhanced chemodynamic therapy is a novel and promising strategy for effective tumor treatment. Herein, a kind of polydopamine (PDA)-based nanoplatform is reported for photothermal-enhanced chemodynamic therapy against tumor cells. PDA nanoparticles (NPs) were prepared through the self-polymerization method, which were subsequently chelated with Cu 2+ and linked with poly(ethylene glycol) (PEG) chains, finally obtaining PDA-Cu(II)-PEG NPs. The fabricated PDA-Cu(II)-PEG NPs were uniform in shape with a narrow polydispersity. They can firstly react with glutathione (GSH) to generate Cu + , inducing GSH depletion meanwhile. The formed Cu + could catalyze H 2 O 2 to produce hydroxyl radicals (˙OH) via a Fenton-like reaction. The formed PDA-Cu(II)-PEG NPs displayed good photothermal conversion efficiency and photothermal stability. They can be internalized by 4T1 cells effectively. Under near-infrared light irradiation, PDA-Cu(II)-PEG NPs can generate hyperthermia and ˙OH for photothermal/chemodynamic therapy against tumor cells.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 37
·50949
·
IF 3.125
Fan Kong,Xueli Jia,Shuting Zhang,Mengqi Lin,Yu Cheng
We have synthesized an amphiphilic block copolymer poly(N-isopropylacrylamide)- b -poly(N-vinylcarbazole) containing 1,8-naphthalimide and spirolactam rhodamine 6G moieties via reversible addition-fragmentation chain transfer radical polymerization. The photoluminescence (PL) spectrum of the poly(N-vinylcarbazole) block well matches the absorption spectrum of the 1,8-naphthalimide moiety and the enhanced emission with a peak at 510 nm from the 1,8-naphthalimide moiety is found in the block copolymer film for excitation at 330 nm. The 560-nm emission from the rhodamine 6G moiety is observed as the block copolymer film sprayed by Britton-Robinson (B-R) buffers or Fe 3+ aqueous solutions for excitation at 330 and 400 nm. The PL intensity at 560 nm is markedly increased for the pH value of the B-R buffer lower than 3.0 or the Fe 3+ concentration in water higher than 5 × 10 −4 M. The 560-nm PL intensity is much higher for the block copolymer film photoexcited at 330 nm than that photoexcited at 400 nm due to double-step resonance energy transfer. The PL intensity ratio of 560 to 510 nm (I 560 /I 510 ) is dependent on the resonance energy transfer from 1,8-naphthalimide to rhodamine 6G, which is sensitive to the concentrations of H + and Fe 3+ ions in water.
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高影响因子
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