JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 7
·e53493
·
IF 3.057
Zhaohui He,Yinbiao Feng,Cong Wang,Junjiao Yang,Tianwei Tan,Jing Yang
The green sustainability of the plastic industry always gives impetus to develop the biobased and biodegradable polymers for substituting chemical products. In this study, aliphatic poly(ethylene succinate)-based poly(ether ester)s (PES-based PEE) were firstly explored via one pot/two-component industrial melt polycondensation of succinic acid (SA) and ethylene glycol (EG) in the catalytic combination of titanium tetraisopropoxide (TTP) and methylsulfonic acid (MSA). Their thermal properties and mechanical behavior were analyzed in detail. Based on complementary properties of PES-based PEEs and poly(lactic acid) (PLA) in the aspect of the flexibility and ductility, the copolymerization of poly(ethylene succinate)-poly(diethylene glycol succinate) (PES-PDES) with PLA with low molecular weight was further systematically elaborated and characterized. The results from differential scanning calorimeter showed all the copolymers with different LA contents were amorphous without the melting temperatures. Only one α relaxation revealed by DMA indicated PES-PDES and PLA segments were random distribution and compatible. The monotonical decrease in glass transition temperatures ( T g s) hinted the mobility enhancement of the copolymers with increasing PES-PDES contents. All the copolymers PES-PDES-PLAs exhibited relatively high thermal degradation temperature with T 5% above 280°C. The mechanical properties and degradable behavior of the copolymers were significantly ameliorated by changing the composition fractions of PES-PDES and PLA in the architecture.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 8
·e53502
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IF 3.057
Hui Xu,Zhiqing Liu,Chenghui Qiao,Xintao Zhang,Qi Zhang,Yuerong Zhang,Yaochen Zheng
High-performance graphene oxide (GO) and graphene reinforced epoxy composites have made great development in various properties (such as, mechanical and thermal property) compared with the neat epoxy thermosets. However, under curing conditions, the GOs are thermal reduced and give rise to aggregation, deteriorating the properties of the epoxy/GO composites. Here, GOs and thermal reduced GOs (rGOs) could be uniformly dispersed in epoxy resin under the assistant of the dispersant, pyrene group functionalized polyethylene glycol (Py-PEG-Py). The thermal reduced behavior of GOs had been proved by the tests of X-ray photoelectron spectroscopy (XPS). And the dispersion of individual GO sheets within epoxy matrix was confirmed by the measurements of dynamic laser scattering (DLS). Accordingly, the remarkable enhancement in performances of GOs reinforced epoxy was achieved. Typically, incorporation of as less as 0.03 wt% GOs and 3.0 wt% Py-PEG-Py, flexural strength (113.2 MPa) increases by 56.5%, fracture toughness ( K IC ) (1.94 MPa m 0.5 ) increases by 55%, respectively. This work confirms GO can be thermal reduced under curing conditions and also highlights the importance of the microscopic uniformity of GO or rGO within epoxy matrix on the mechanical performances of composites.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 3
·e53338
·
IF 3.057
Shenglong Shi,Jinsheng Sun,Kaihe Lv,Qingzhi Wen,Yingrui Bai,Jintang Wang,Jiafeng Jin,Jingping Liu,Xianbin Huang,Jian Li
To prepare the thickener of fracturing fluid with temperature resistance, salt resistance and quick dissolution, an emulsion thickener (ASC) was synthesized by acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, and acryloyl morpholine. The dissolution, salt resistance and drag reduction of ASC, and the viscoelasticity, temperature resistance and shear resistance and gel breaking properties of fracturing fluid formed by ASC and zirconium crosslinker were investigated. The results showed that the sticky time of ASC was less than 60 s and the drag reduction rate was 72.5% in 100,000 mg/L brine, showing that ASC had thickening ability in high salinity brine and satisfied the requirements of continuous fluid preparation on the fracturing process. The viscosity of ASC fracturing fluid was 98 mPa s after shearing at 200°C and 170 s −1 for 150 min when the salinity was 100,000 mg/L. When the ammonium persulfate concentration was 400 mg/L, the viscosity of the broken fluid was 4.0 mPa s. The temperature resistance, salt resistance and shear resistance of ASC emulsion fracturing fluid could be significantly improved by the introduction of acryloyl morpholine, ASC fracturing fluid had the characteristics of high elasticity and low viscosity, which could meet the application requirements under ultra-high temperature reservoirs.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 4
·e53364
·
IF 3.057
Yannan He,Dacheng Qiu,Zhiqiang Yu
Failure mechanism of rigid polyurethane foam (RPUF) treated under different conditions was studied by means of experiments and numerical simulation. Thermal degradation mechanism of RPUF under different temperatures was characterized by thermogravimetric analysis-Fourier transform infrared spectrometry coupled with gas chromatography–mass spectrometry (TG-FTIR-GC–MS) in air and nitrogen atmosphere, respectively. And the vibration failure mechanism of RPUF was analyzed by finite element analysis (FEA) and extended finite element method (XFEM). The experimental results indicated that the failure mode in nitrogen was the broken of carbamate groups, and in air was the broken of carbamate groups and the radical decomposition of ether groups. Numerical simulation suggested that there was vibration stress concentration in the center of foam prism, which was easy to produce sliding and opening fatigue cracks during random vibration.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 3
·e53320
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IF 3.057
Lijun Guo,Yuxin Gao,Jin Huang,Jingqi Xue,Feng Li,Cuiqin Li
The functionalized covalent organic framework materials play an important role in catalytic application. A convenient tactic is developed to design and synthesize an imine-linked covalent organic frameworks (COFs) material (COF-PD) with abundant nitrogen atoms, which can provide coordination active site and facilitate the incorporation of COFs with nickel ions. Nickel-coordinated COF-PD complex (COF-PD-Ni) is prepared and used in ethylene oligomerization. COF-PD-Ni displays the highest catalytic activity of 1.98 × 10 5 g/(mol·Ni·h) in ethylene oligomerization with MAO as co-catalyst and cyclohexane as solvent. Various reaction parameters including reaction temperature, time, solvent, and the amount of cocatalyst are evaluated in detail, dramatically impacting the catalytic activities as well as the distribution of the products. What is more, the effect of COFs structure on the catalytic performance is also studied, suggesting more coordination sites were more important for high activity.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 15
·e53716
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IF 3
Cai-xia Yang,Jun Li,Yu-qing Zhang,Chao Wu,De-qiang Li
Efficient utilization of pesticides has presented various advantages in the ecological environment, food safety, and agricultural sustainability. Pesticide microcapsule could significantly improve the pesticide utilization ratio, and thus, we prepared a sustained-release microcapsule from cellulose nanocrystal (CNCs) stabilized Pickering emulsion template. The NaCl was added to overcome the strong electrostatic repulsion among CNCs for forming a stable oil-in-water (O/W) CNCs-based Pickering emulsion template, followed by crosslinking with hexamethylene diisocyanate on the interface. UV–vis and zeta-potential were used to characterize the as-prepared Pickering emulsion, and the stability and emulsion fraction were calculated. Results indicated that NaCl contributed to the stability of Pickering emulsion, even at a low concentration. The obtained CNCs-based microcapsule was characterized by FT-IR, XRD, SEM, TG-DTG, and three-phase contact angles. The microcapsule presented an encapsulation efficiency of 96.76% and sustained release of the imidacloprid for more than 82 h. Results indicated the potential for loading and sustained release of imidacloprid, which is beneficial to the environment, food, and agriculture.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 14
·e53705
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IF 3
Xingshan Yin,Huameng Liu,Ruijun Lin,Xiaochun Liu,Zhiyi Huang,Jiahao Du,Yuxin Gu,Xiaofeng Lin,Wenjing Lin,Guobin Yi
Nowadays, polyurethanes with multifunctional and multiple shape memory effects, especially those without the use of toxic phosgene and isocyanate, have attracted significant attention. In this work, to prepare a kind of non-isocyanate polyurethane (NIPU) with triple shape memory effect, we introduced the behenic acid (BA) with good crystallinity into the NIPUs network, which combines glass transition of the cross-linked network and crystallization-melting of behenic acid, endowing the NIPUs with two independent transition temperatures: the glass transition temperature ( T g ) and crystallization melting temperature ( T m ). Specifically, the NIPUs were synthesized by the addition reaction of bi-functional cyclic carbonate and semi-crystalline curing agent. The bi-functional cyclic carbonate was prepared by thiol-ene click reaction, and the BA was grafted onto polyethyleneimine to prepare semi-crystalline curing agent. By adjusting the ratio of BA to PEI and curing temperature, the crystallinity of NIPU can be tuned in a wide range, so that the NIPUs has tunable and superior triple shape memory performance, and the shape recovery rate is almost 100%.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 13
·e53668
·
IF 3
Pengxin He,Haihong Pu,Xinfeng Li,Xiaoqiong Hao,Jianhua Ma
Flexible and highly conductive fiber has attracted considerable attention with its massive potential in functional fabric, stretchable circuits, and wearable electronic devices. Herein, we prepared a novel secondary structure composite fiber based on aramid nanofibers (ANF)-reinforced thermoplastic polyurethane (TPU) fiber accompanied by carbon nanotube (CNT)-coated on its surface. The composite fibers' dispersibility, micromorphology, and application were systematically investigated. The TPU/ANF-0.5 wt% sample showed a robust reinforcing effect, as Young's modulus and tensile strength reached 17.2 and 20.2 MPa, respectively. Meanwhile, the conductive coating layer in the outer frame was formed via a TPU solution with 10 wt% CNT content, which gives the fiber excellent flexible electrical conductivity. Such a unique structural design enables the fiber to be closely attached to human skin and monitor human movement. In addition, this TPU/ANF@CNT composite fiber can also be used for light and electric heating. The photothermal equilibrium temperature can reach 120°C in 50 s, and the electrothermal equilibrium temperature increases to 62°C under 30 V. In summary, this secondary structure composite fiber with excellent electrical and mechanical properties might have great practical application potential in wearable electronic devices.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 13
·e53670
·
IF 3
Wei Wang,Qing Wang,Xiaoju Chen,Yaqiong Kong,Mengqing Wu,Shuangshuang Zhu,Minmin Chen,Linlin Li
Biodegradable active packaging materials have received growing attention for extending the shelf life of foodstuffs. A Pectin/eugenol (Pe/Eu) composite film is prepared by casting from pectin and eugenol. The morphology and wettability of the composite film are characterized. The antioxidant activity of the composite film is determined with DPPH method. Special attention is given to the release kinetics of Eu from Pe/Eu composite film and its application in pork preservation. The results display that Eu increased the surface roughness, hydrophobicity, and antioxidant activity of the composite film. In addition, the release mechanism of Eu from Pe/Eu composite film is controlled by diffusion. The release behavior of Eu in Pe/Eu composite film can prolong the shelf life of pork. Therefore, our results suggest that Pe/Eu composite films can provide new ways for active packaging materials to extend the shelf life of animal-based protein foods.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 9
·e53546
·
IF 3.057
Wei Lu,Zhipeng Zeng,Zhenglong He,Yuntao Liang,Yong Sun,Shuanglin Song,Lili Wang,Ruling Liu
A highly dispersed melamine/red phosphorus (MA/RP) composite flame retardant was prepared by means of simple mechanical grinding. After co-thermal pretreatment with polyether polyol (PPG-2000) at 135°C, organic–inorganic hybrid foams (MA/RP/HF) containing MA/RP flame retardant were prepared by the one-step method using main raw materials such as polyisocyanate and sodium silicate. When 0.5 wt% MA/RP with the mass ratio of 1:5 is added, MA can realize the uniform dispersion of RP in the substrate and enhance its flame retardancy, and the obtained MA/RP/HF presents uniform and closed pores and excellent basic properties. The TG results reveal that MA/RP/HF shows good thermal stability and the corresponding char residual rate reaches 37.9% at 800°C. The flame retardant test results prove that MA/RP/HF is capable of passing the V-0 grade, with the LOI value being 26.8%. According to the cone calorimeter analysis, its peak heat release rate and total heat release decrease by 30.1% and 51.7% compared with those of rigid polyurethane-based foam and by 40.1% and 30.0% compared with those of pure HF, respectively. Finally, the synergistic flame retardancy mechanism of MA and RP on polyurethane-based foam was discussed.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 8
·e53513
·
IF 3.057
Jingru Sun,Huan Liu,Sheng Xu,Ying Zhu,Chunmiao Xia,Lei Gan,Rongli Zhang,Cuige Zhang,Zongcheng Miao
A new strategy was developed to prepare nanoscale porous carbon spheres (PCSs) using cross-linked chitosan/poly(γ-glutamic acid) colloidal particles as precursor. The fabricated cross-linked chitosan/poly(γ-glutamic acid) colloidal particles (Ca 2+ /CS/γ-PGA CPs) were prepared from the self-assembly of negatively charged poly(γ-glutamic acid) and positively charged chitosan, and the cross-linking of Ca 2+ in aqueous solution, via the electrostatic interaction. After lyophilization, the Ca 2+ /CS/γ-PGA CPs power was obtained, followed by carbonization in a tube furnace under N 2 atmosphere. Finally, the products were washed by hydrochloric acid, obtaining PCSs with hierarchical pore structure and super-hydrophobicity. The prepared PCSs exhibited excellent separation performance for oil-in-water emulsions.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 6
·e53427
·
IF 3.057
Bing Yin,Xujiang Hua,Fangyu Fan,Dongmei Qi,Kailu Han,Youqing Hou,Dongshuai Hou
Improving the permeability of concrete is one of the important measures to extend the service life of concrete. In addition, for marine engineering, sewerage projects, and so on, mechanical stability and microbial induced corrosion of concrete structures cannot be ignored. We demonstrated a method to prepare high-performance super-hydrophobic (SHP) coating using functional zirconium phosphate (ZrP) and polydopamine (PDA) as the primary materials. The micro-nano rough structures were constructed on the concrete surface by alternating organic–inorganic assembly guided by each other. The coatings' apparent morphology, composition, and structure were analyzed using various surface analysis techniques. Based on the construction of micro-nano rough structures by the induced assembly of functional ZrP, the silane treatment significantly improved the water contact angle of the coating (WCA = 154° ± 3°), and the coating exhibited relatively high wear resistance, reaching 135° WCA even after 30 friction cycles. The water absorption of the specimens treated with the SHP composite coating was reduced by 79% to treated with silane. Meanwhile, the SHP composite coating showed excellent antimicrobial and anti-ice properties, due to the role of the functional ZrP and alternating organic–inorganic assembly. It was expected that the composite coating might potentially promote and accelerate applied superhydrophobic anticorrosive coating development for marine concrete durability.
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高影响因子
危险品化学品经营许可证（带存储）