JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 33
·e55841
·
IF 2.7
Yu Du,Hang Tao,Yang Yang,Changzhi Su,Junrong Wang,Yongnian Wang,Boping Liu,Yulong Jin
In this work, four kinds of silica with similar textural properties but different particle size (PS) from 6 to 60 μm were selected as support to prepare silyl-chromate/VO x /silica bimetallic catalysts for ethylene polymerization, thus making it possible to conduct convincing investigation on the effects of catalyst PS over catalytic behaviors and polymer properties. It is found, owing to mass- and heat-transfer limitations, the catalysts with smaller PS showed higher initial activity, while the deactivation in the later stage was more remarkable. Meanwhile, catalysts with smaller PS synthesized bimodal ultrahigh molecular weight polyethylene/high-density polyethylene in-reactor blends (UHMWPE/HDPE IRBs) with higher molecular weight ( MW ) and narrower molecular weight distribution (MWD). Four PE sample couples with MW increasing from 5 × 10 5 to 10 × 10 5 g mol −1 and PS from 40 to 460 μm were selected for tensile and rheological tests. For each couple with similar MW and MWD, the sample with smaller PS always had larger tensile strength and breaking elongation. The cryogenically fractured surface of the samples made by smaller PE particles showed fewer delamination defects and unfused small particles. The rheological results indicate that higher homogeneity was achieved for the sample with smaller PS, which was reflected by the unexpected higher viscosity and storage modulus.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 32
·e52765
·
IF 3.057
Pengjia Shan,Hengyu Lu,Ning Chen,Hongzhi Liu,Xianhui Zhang,Xiaohuan Liu
Designing biobased hyperbranched polyesters from vegetable oil has been attracting considerable interests from academic industrial communities. Herein, a novel fully biobased hyperbranched polyester (HBPE) was prepared by self-condensation of AB 2 -type bioderived monomer based on methyl ricinoleate (MR), a castor oil-derived renewable chemical. The reaction conditions were optimized to obtain the AB 2 -type monomer in a high conversion ratio (up to 87%). The self-condensation of AB 2 -type monomers was carried out in the presence of two kinds of transesterification catalysts (Ti(OBu) 4 versus Zn(Ac) 2 ), among which Ti(OBu) 4 was found to be more efficient one and yield higher molecular weights in the range of 5800~11,500 g/mol. The resulting HBPEs were characterized in terms of Fourier transform infrared spectroscopy, nuclear magnetic resonance, differential scanning calorimetry, and thermogravimetric analysis. The degree of branching was calculated to be 0.33~0.39. Thermal analysis revealed that the as-prepared HBPEs were amorphous with tunable glass transition temperatures ranging from −44.8 to −24.6°C. All the prepared HBPEs exhibited good thermal stability with the maximum onset decomposition temperature ( T onset ) up to 294.6°C. These structural features and properties of resulting biobased HBPEs enabled them to act as a potential ‘greener’ additive for polymers.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 34
·50849
·
IF 3.125
Shao-Xia Zhang,Long Xu,Zhi-Hui Chen,Shu-Ting Fan,Zhen-Jiang Qiu,Zi-Jun Nie,Bang-Jing Li,Sheng Zhang
γ-cyclodextrin (CD)-metal-organic framework (MOF)-K is developed as a new kind of green template for the preparation of hierarchical porous carbon (HPC). Three-level porous structure (micro-, meso-, and macro-pores) has been successful constructed by calcined γ-CD-MOF-K at 600°C. The fabricated carbon (HPC-600) shows good microwave adsorption ability due to its unique hierarchical porous structure (macropores allow microwave enter the interior of the absorbents, and then micro- and meso-pores attenuate the incident microwave effectively by multiple reflections and polarization loss caused.) The minimum reflection loss (RL) is − 23.5 dB and the effective absorption bandwidth (EAB, RL≤− 10 dB) is 4.3 GHz. This work provides a good reference for efficient and environment-friendly microwave absorbents. In addition, the applications of HPC-600 may further expand to adsorption, sensing and supercapacitors due to the hierarchically porous structure.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 36
·49081
·
IF 2.52
Huan Yu,Haiyan Liu,Xiaoya Pang,Miaomiao Zhang,Hongyuan Yan,Ligai Bai
In this study, a composite poly(functional graphene oxide- co - N -isopropylacrylamide- co -trimethylolpropane triacrylate- co -ethylene dimethacrylate) (poly(f-GO- co -NIPAAm- co -TMPTA- co -EDMA)) monolith was prepared, in which f-GO was added. The obtained monolith was characterized by nitrogen adsorption–desorption isotherm and scanning electron microscopy. The monolith exhibited a homogeneous and continuous structure, good permeability, and large surface area. The composite monolith was used as solid-phase extraction absorbent in conjunction with high-performance liquid chromatography for enrichment of ursolic acid. The calibration equation was y = 73.3980 x + 0.2555, and the linear regression coefficient was 0.9987; The calibration curve was ranged from 1 to 700 μg ml −1 ; The limit of detection and limit of quantification values were 0.3 and 1.0 μg ml −1 , respectively; The intraday and interday precisions were less than 2.6 and 7.4%, respectively. The recovery was in the range of 84.44–111.76%. Moreover, the adsorption amount of ursolic acid on the composite monolith was compared with the monolith without f-GO added and silica gel-C18 adsorbent. The results showed that the composite monolithic column was feasible to be used as an online SPE absorbent, which exhibiting low back pressure, good permeability, and high adsorption capacity. In addition, this method provided the possibility to extract and analyze trace components from medicinal plants.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 18
·52075
·
IF 3.125
Bihua Xia,Xuhui Zhang,Yang Wang,Ting Li,Jie Jiang,Mingqing Chen,Tianxi Liu,Weifu Dong
This paper reported a new kind of multilayer cross-linking polyetherimide/Ti 3 C 2 T x MXenes material with pores channel structure for electromagnetic interference shielding. Polyetherimide was used as the resin material, ethylenediamine (EDA) was used as the cross-linking agent, special multilayer and pores channel were used as the shielding structure, and Ti 3 C 2 T x MXenes was used as the electromagnetic wave shielding medium. By adjusting the content of EDA, the cell structure, electromagnetic interference shielding efficiency, and tensile strength of multilayer cross-linking PEI/Ti 3 C 2 T x MXenes shielding material could be controlled. The more EDA content, the higher cross-linking degree, the smaller the cellular size, the higher the electromagnetic interference shielding efficiency, and the stronger the tensile strength.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 8
·48405
·
IF 2.188
Qing Wen,Lijuan Xu,Xiansen Xiao,Zhenghui Wang
Cationic nanopolystyrenes (CNPSs) were prepared by the polymerization of styrene with a cationic polymerizable emulsifier, N-(2-(methacryloyloxy)ethyl)-N,N-dimethyltetradecane-1-ammonium bromide (MDTB), in the presence of 2,2′-azobis(2-methylpropionamidine) dihydrochloride (APPH). The polymerization kinetics was investigated through monomer conversion versus polymerization time. 1 H NMR spectra and FTIR spectra were used to confirm the structures of MDTB and nanopolymers. The particle size, ζ-potential, molecular weight, and thermal stability were also investigated by Zetasizer, gel permeation chromatography, and thermogravimetric analysis, respectively. The antibacterial activities of the obtained products were evaluated by minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) against Staphylococcus aureus ATCC 29913 ( S. aureus , a Gram-positive bacterium) and Escherichia coli ATCC 25922 ( E. coli , a Gram-negative bacterium). The results indicated that the polymerization has the characteristics of microemulsion polymerization, all nanopolystyrenes are cationic and can be stored in the form of a microemulsion in aqueous phase, CNPSs present stable chemical structure at 190 °C, and their MIC and MBC reach 0.0625 and 0.125 mg mL −1 for E. coli , 0.0325 and 0.0625 mg mL −1 for S. aureus , respectively. Therefore, CNPSs are a promising new type of polymer antimicrobial agent, which can be used in the development of antimicrobial polymer materials and their products. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48405.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 45
·49413
·
IF 2.52
Ziyue Yang,Dongcheng Sun
A facile method for preparing supramolecular waterborne polyurethane (WPU) based on quadruple hydrogen bonds (4H-WPU) is reported. Herein, 4H-WPU with quadruple hydrogen bonds in main chain were synthesized by poly (1,4-buthylene-neopentylene adipate glycol) as soft segment, 2-ureido-4[1H]-pyrimidinone (UPy) functionalized monomer, isophorone diisocyanate, 2,2-Bis(hydroxymethyl)propionic acid (hydrophilic monomer), isophorondiamine, triethylamine (neutralizer), and monoethanolamine (blocking agent) as hard segment. The molecular weight of 4H-WPU was controlled around 18,000 consistently. The properties of 4H-WPU with different content of hydrophilic group, hard segment, and UPy units were characterized and the results could provide the reference for preparing supramolecular WPU with high mechanical and self-healing performance while maintaining dispersion stability. The tensile strength of 4H-WPU was 10 times of the blank sample. The healing time of scratched 4H-WPU film was inversely proportional to the content of UPy- functionalized monomer and the shortest healing time is 2.5 hr at 80°C. Mechanical performance of healed films can be restored to more than 90%.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52224
·
IF 3.057
Chuangchuang Sun,Wei Zhang,Yihua Cui,Dongyue Liu
A phosphazene-triazine bi-base sulfonate compound (CPNS) was synthesized using hexachlorocyclotriphosphazene, cyanuric chloride, and sodium p-hydroxybenzene sulfonate as raw materials. The chemical structure was determined by FTIR, 1 H NMR 31 P NMR (NMR stands for nuclear magnetic resonance), and elemental analysis of P, Na. To study the flame retardant properties of CPNS, a series of modified polycarbonate (MPC) with different ratios of CPNS were prepared. The flame retardant performance and thermal stability of CPNS/MPC were characterized by limiting oxygen index (LOI), UL-94 vertical burning test, cone calorimetry test, and TG. Results show that when CPNS is added to 0.3%, the CPNS/MPC can pass the UL94 V-0 level with an LOI value of 35.3% and reduce the peak heat release rate by 16.89% during the combustion. TG results show that adding 0.1% CPNS can decrease the initial decomposition temperature of the MPC by 68°C in nitrogen and 27°C in air. The reduction of the initial decomposition temperature means that the flame retardant promotes the isomerization reaction of polycarbonate accelerates the formation of an intermediate char on the surface. Investigation of intermediate char residue's morphology and chemical structure demonstrates that CPNS promotes the formation of more complete and compact char residue, which acts not only there is increased opportunity for radical recombination reactions in the condensed phase but also as physical barriers to inhibit the transfer of heat and oxygen, resulting in good flame retardant properties.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 16
·50229
·
IF 2.52
Pengxuan Zheng,Jiye Qiu,Xiangwei Wang,Zhiwei Yu,Yong Ma,Tingxi Li
The polymer electrolytes based on poly(vinylidene- co -hexafluoropropylene) (PVDF- co -HFP) have been widely studied and applied in devices for its excellent electrochemical and mechanical properties. Here, porous PVDF- co -HFP membrane modified with glass fibers (GFs) and polyvinyl pyrrolidone (PVP) were fabricated by phase-transfer method. When the dosage of GFs exceeded 1 wt%, the composite membranes exhibited 6.11 MPa tensile strength. When the dosage of GFs and PVP reached 1% (PVP 1 GF 1 ), respectively, the composite membranes in porous network structure possessed the highest electrolyte uptake of 251.02%, the thermal stability of 343°C and the ionic conductivity of 3.05 × 10 −3 S cm −1 . Electrochromic device (ECD) was assembled with PVP 1 GF 1 electrolyte, showing quick responses between the bleached and the color states within 3 s. The PVDF- co -HFP composite electrolyte was expected to be effective substitutes for liquid electrolytes used in ECDs.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 34
·48982
·
IF 2.52
Jian Yang,Tong Zhang,Yue Yin,Wenhong Jiang,Yunzhe Du,Xiaofei Zhu,Bo Jiang,Yudong Huang
Reactive group content was a key parameter in polymer curing process. However, the conventional methods to measure the curing were destructive and time consuming. In this article, near-infrared spectra technology had been applied for reactive group analysis of the photothermal curing silicone to achieve rapid nondestructive and quantitative detection. The calibration model was developed about epoxy value and CC double bond value, with determination coefficient ( R 2 ) of 0.9631 and 0.9689. Root mean square error of prediction were 0.0179 and 0.0143 by partial least square regression. The optimized calibration model was used to predict the content of epoxy value and CC double bond value in the photothermal curing process, it proved that the silicone resin cured under UV-radiation and heat. This novel method provided a promising approach to analysis the curing mechanism and quality parameters of resin.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 24
·48803
·
IF 2.188
Yang Xu,Ying Xiong,Shaoyun Guo
In this work, poly( ε -caprolactone) (PCL) and liquid plasticizer were combined used to plasticize poly(vinyl chloride) (PVC), and the possibility of using PVC/PCL/plasticizer blends to fabricate soft PVC with enhanced migration resistance was investigated. Through partial replacement of liquid plasticizers in soft PVC by equal quantity of PCL, flexibility was maintained while extraction loss of plasticizer by organic solvent was reduced significantly. Furthermore, crystallization of PCL in PVC/PCL/plasticizer blends with low PCL content was observed, and crystallization rate of PCL was found to be influenced by plasticizer contents and structures. For instance, crystallization rate of PCL in PVC/PCL/diisononyl phthalate (DINP) (100/40/100) was 3.7 times faster than in PVC/PCL/DINP (100/40/80), while crystallization rate of PCL in PVC/PCL/dioctyl adipate(DOA)(100/40/100) was 8.3 times faster than in PVC/PCL/diisononyl cyclohexane-1,2-dicarboxylate (DINCH) (100/40/100). Low-field 1 H NMR test manifested that different crystallization rate of PCL in PVC/PCL/plasticizer blends with different plasticizer structures was triggered by difference in plasticizers' compatibility with PVC, that is, the number of interaction point between PVC and plasticizers. It is concluded that PCL crystallization favored by liquid plasticizers in PVC/PCL/plasticizer blends was induced by interaction competition between PVC/plasticizer and PVC/PCL. As plasticizer content increases or its compatibility with PVC decreases, interaction competition becomes more intense and consequently faster crystallization of PCL occurs. Thus, to obtain soft PVC products with improve migration resistance while avoiding PCL crystallization, the total content of plasticizer (including both liquid plasticizer and PCL) should be lower than 66 phr (40 wt %). © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48803.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 15
·51943
·
IF 3.125
Xuejun Zhou,Jiyou Zong,Jun Lei,Zhongming Li
In this work, a series of spherical boron nitride/silicone rubber (sBN/SR) composites were prepared, and the influence of different shapes and sizes of BN on the thermal conductivities of the composites was investigated. Additionally, hybrid spherical boron nitride/silicon rubber (hybrid sBN/SR) composites were fabricated by synchronously incorporating two kinds of sBN particles into SR to perfect the thermal conduction paths, and a synergistic effect of the fillers was achieved. The thermal conductivity of the composite could reach 1.70 W/(m·K) at the 35 wt% filler content, which is clearly superior to the composite containing single type of filler and stands at a very high level at such a filler fraction according to the reported literature. Also, the experimental results were supported by the Agari's equation. In addition, the composites show a low hardness (shore A hardness < 60) due to the low filling content. The prepared materials hold great promise in thermal interface materials for thermal management of state-of-the-art electronic equipment.
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高影响因子
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