JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 33
·e54275
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IF 3
Chengde Liu,Luyao Jiang,Wanting Du,Xitong Cheng,Zheng Zhao,Jinyan Wang,Xigao Jian
Mineralization can help improve the mechanical properties and degradation rates of collagen scaffolds while ensuring good biocompatibility, thereby providing a suitable microenvironment for osteogenic differentiation. Intrafibrillar/extrafibrillar mineralization of collagen is promoted by polymer-induced liquid precursors (PILP). In this study, polyacrylamide (PAM) was introduced to PILP which synergistically mineralized collagen scaffold intrafibrillarly and extrafibrillarly. PAM and polyacrylic acid (PAA) can stabilize the amorphous calcium phosphate (ACP), to form a PILP of PAM and PAA/ACP. As a control, another scaffold material was formed using the conventional mineralization method, that is, soaking collagen in a simulated body fluid. Collagen mineralization was characterized using SEM and TEM. After 7 days of mineralization with PILP, intrafibrillar crystallization of collagen was significantly higher than that in the control group, and the stiffness and modulus of this scaffold material significantly increased. Cellular experiment results indicated that the PILP-mineralized collagen scaffold was biocompatible and promoted the osteogenic differentiation of MC3T3-E1 pre-osteoblasts. Biomimetic mineralization by PILP will assist the fabrication of mineralized collagen scaffold for bone repair applications.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 34
·e54304
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IF 3
Feixue Sun,Qi Yao,Yiting Wang,Jiemin Lou,Qiang Li,Qian Tao,Guiying Li
Hydrogels based on dynamic covalent bonds have unique properties and are competent in many biomedical fields. However, critical issues such as biocompatibility, mechanical properties, and stimulus responsiveness are required to be solved. It is also expected to develop a simple preparation method with mild conditions. Based on these objectives, chitosan (CS), sodium alginate (SA) and 2-formylphenylboronic acid (2-FPBA) are used to prepare the dynamic covalent bond hydrogels within minutes neither chemical medications nor severe conditions. Benefiting from the imine borate and boronic ester bonds both formed in the hydrogels, the hydrogels are stable, injectable, and of efficient self-healing properties. The damage-recovery process can be repeated for more than 6 cycles. The microstructure of the hydrogels recoded by atomic force microscopy (AFM) is consistent with the mechanical properties and both of them could be affected by the concentrations of SA and 2-FPBA. Moreover, the dynamic hydrogels are responsive to pH values and oxidative environment. When the model drug 5-fluorouracil (5-FU) is loaded in the dynamic hydrogels, the release profiles are sustainable and present significant differences with various stimuli. These dynamic covalent bond hydrogels have a promising prospect in tissue engineering and drug delivery.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 38
·e54440
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IF 3
Quan Xuan Duong,Nguyen Hanh Do,Hien Thanh Pham,Thu Hong Anh Ngo
This study endeavors to augment the antibacterial and anti-biofouling properties of thin-film composite polyamide membranes by subjecting them to modification with antibacterial chitosan and silver nanoparticle materials through the UV-induced graft polymerization technique. Various surface assessment methods were employed, and the efficiency of the membrane performance was demonstrated through the flux and the retention of the filtration process, which used calcium chloride as the foulant. Antibacterial, antifouling, and anti-biofouling capabilities were assessed through several tests. The findings revealed that the chitosan/silver nanoparticles-grafted membranes exhibited superior antibacterial and anti-biofouling abilities with consistent flux and enhanced retention, underscoring the prospective implementation of this approach in filtration systems to curtail biofouling and bolster overall efficacy.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 37
·e54408
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IF 3
Yue Sun,Jiaojiao Bai,Zhe Wang,Huabin Li,Hua Dong
A cellulose aerogel with very low overall density is fabricated by freeze-drying aqueous cellulose solution. A hydrophobic/oleophilic cellulose aerogel is further fabricated by coating the cellulose aerogel with hexyltrimethoxysilane-modified SiO 2 nanoparticles. The features of the developed hydrophobic/oleophilic cellulose aerogel are characterized with density and porosity measurement, infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and contact angle measurement. Finally, the oil absorption performance of the developed hydrophobic/oleophilic cellulose aerogel is investigated. The results show that SiO 2 nanoparticles have been successfully loaded on the surface of the aerogel backbone after fulfillment of fabrication, and the surface of the aerogel turns to be hydrophobic/oleophilic (water contact angle 131° and oil contact angle 0°). The oil absorption experiment results show that the absorption capacity for organic solvents is from 10 to 21 times the initial aerogel weight, depending on the density of the absorbed organic solvents. In addition, the aerogel still maintains good stability in high temperature, strong acid or strong base conditions. Furthermore, the aerogel also shows good performance in separating oil from oil–water mixtures. This hydrophobic/oleophilic cellulose aerogel can be a promising choice for remedying water pollution caused by oil contamination.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 44
·e54614
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IF 3
Yingxue Xu,Na Liang,Jia Fu,Zhe Zong,Xueling Long,Shaoping Sun
In this study, a polymer with tumor targeting function and dual redox/pH sensitivity is designed and synthesized by integrating chitosan (CS), Poloxamer 407 (P407), cholesterol (CHO), folic acid (FA), and disulfide bonds into one molecule (P407-CS(FA)-SS-CHO). The polymer can self-assemble in water to form micelles and solubilize paclitaxel (PTX). The mean particle size of PTX-loaded P407-CS(FA)-SS-CHO micelles is 133 nm. In vitro drug release study demonstrates the acid and glutathione (GSH) triggered PTX release behavior of the micelles. In vitro and in vivo experiments demonstrate the excellent tumor growth inhibition efficacy and low systemic toxicity of the PTX-loaded micelles. The P407-CS(FA)-SS-CHO micelles will be potential intelligent drug carriers for PTX delivery.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 44
·e54608
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IF 3
Song Wang,Lingchen Meng,Qi Chen,Sanxi Li,Ailing Zhang
The synthesis and application of the bio-derived flame retardant can meet the current requirements for the high-efficient and sustainable development of flame retardants. Therefore, using phytic acid (PA), 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), and piperazine as raw materials, a PA-derived flame retardant (PAPDOPO) was prepared. Fourier transform infrared spectroscopy and x-ray diffraction techniques were applied to characterize the structure of the PAPDOPO. In the prepared flame-retardant epoxy resin (FEP), PAPDOPO showed high flame retardancy. When 4% PAPDOPO was added into epoxy resin (EP), the prepared FEP (EP-PAPD-4) passed the V-0 level in the UL-94 test, and the limited oxygen index value of EP-PAPD-4 reached 35.3%. Microcombustion calorimetry test was also applied to demonstrate the performance of PAPDOPO. The peak heat release rate of EP-PAPD-4 was reduced by 30.4% compared with that of the pure EP. Due to the low addition amount of PAPDOPO in FEP, the mechanical properties of the FEP using PAPDOPO as flame retardant were hardly decreased compared with pure EP.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 43
·e54499
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IF 3
Jiangjiang Wang,Jie Zeng,Hui Wu,Lihua Zeng,Shouping Xu
The flexible wearable hydrogel strain sensors for human motion monitoring have attracted broad attention. However, developing a high-strength hydrogel strain sensor remains challenging and achieves synergistic characteristics such as biocompatibility, antibacterial activity, and conductivity. This work proposes a two-step UV polymerization method for the preparation of (hydrolyzed silk fibroin (HSF)/polyacrylamide (PAM)/polyacrylic acid (PAA)/poly sulfobetaine methacrylate (PSBMA) composite hydrogels. The monomers AM and AA undergo self-polymerization and copolymerization. Meanwhile, SF is cross-linked with them via multiple hydrogen bonds to form the first network. After the second UV initiation, SBMA polymerizes to create the second network. The HSF 8% /PAM/PAA/PSBMA 2% possesses superior tensile strength (1.49 ± 0.07 MPa) and compressive modulus (21.47 ± 1.07 MPa at 99% strain). The SBMA (4 wt%) endows hydrogels with antibacterial activity (98.53% ± 4.93%). The H + ionized by PAA and the ion channels constructed by SBMA (4 wt%) provide hydrogel with ionic conductivity (0.950 S m −1 ). The hydrogel could be used as a flexible strain sensor to monitor human joint activity. The natural silk fibroin allows the hydrogel to retain degradability. Therefore, the SF-based conductive hydrogel shows the potential application in flexible strain sensors.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 40
·1-18
·
IF 3
Xin Kang Li,Bing Jiang,Cong Wei,Hai Lan Lin,Wei Zhao,Ke Yang Ni,Yan Xiao Mu,Jun Bian,Dai Qiang Chen
Herein, multi-walled carbon nanotubes (MWCNTs) with different surfacial structure were first designed and synthesized, and then incorporated into main-chain polybenzoxazine (PBZ) to fabricate PBZ composites. Fourier transform infrared results showed that the ring-opening crosslinking process of benzoxazine (BZ) oligomer was catalyzed due to the existence of COOH and NH 2 groups on the surface of MWCNTs. The enhanced interface interactions between MWCNTs- f BZ and PBZ contributed to the improvement of the mechanical properties. When the MWCNTs- f BZ content was 1.5%, the MWCNTs- f BZ/PBZ composites had excellent tensile strength of 102.64 MPa. The highest impact strength, which was 15.96 kJ/m 2 and 64.15% higher than that of neat PBZ at 1.5% MWCNTs- f BZ was achieved. Through the Halpin-Tsai equation, combined with the experimental results, the correction factor was obtained to predict the mechanical properties. FESEM observations showed that the dispersion of MWCNTs in the PBZ matrix depended on the functional groups of MWCNTs. TGA tests and Horowitz-Metzger calculation found that the thermal decomposition temperature of the composites reached 451.7°C and had the highest decomposition activation energy of 153.20 kJ/mol at 2% MWCNTs- f BZ. In summary, the obtained MWCNTs- f BZ/PBZ composite showed excellent comprehensive performance and can potentially be used as advanced engineering material in demanding environments.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 39
·e54476
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IF 3
Yihui Xu,Yudong Liu,Xuan Qin,Jun Liu,Liqun Zhang
Incorporation of nanofillers (such as silica) into elastomer matrix is the most common strategy to prepare high-performance rubber products. However, the poor dispersion of nanofillers in non-affinity rubber materials and the weak interfacial interaction significantly limit the processing and mechanical properties. To reduce the polarity difference and enhance the interfacial interaction between silica and styrene butadiene rubber (SBR), we prepared a hydroxyethyl acrylate-grafted SBR (SBR-g-HEA) through the redox initiator system, and subsequently fabricated SBR-g-HEA/silica nanocomposites by simple mechanical blending. The effects of reaction conditions on the grafting rate were studied in detail. ATR-FTIR and 1 H-NMR collectively confirmed the successful grafting of HEA groups on SBR molecular chains, and the grafting fraction could be regulated from 0% to 2.5%. Scanning electron microscope (SEM) and rubber processing analyzer (RPA) showed that the incorporation of HEA could significantly improve the dispersion of silica nanoparticles in SBR matrix. Notably, the resulting SBR-g-HEA exhibited significantly enhanced attributes when compared to their unmodified counterparts, including superior mechanical properties, improved wear resistance, and reduced heat generation. The strategy proposed here provided insights toward the fabrication of non-affinity rubber/filler nanocomposites for high-performance rubber products and green tire.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·
IF 3
Yuji Chen,Hongxing Liu,Chuner Lin,Chen Cheng,Fupeng Li,Chuanjie Fang,Liping Zhu
Microplastics have been recognized as a critical threat to the aquatic ecosystem. Membrane separation technology displays great potential to address this issue, while current commonly-used polymeric microfiltration membranes fall short of high separation efficiency due to their wide pore distribution. A perfectly simple strategy for homoporous membranes fabrication using commercial poly(vinylidene fluoride) (PVDF) was reported in this work, enabling precise removal of microplastics. In this strategy, hydrophilicity of dope solution was enhanced by adding proper amphiphilic surfactants initially, followed by a novelly-inserted air exposure progress to gently provide water vapor. Both of the two easy steps induced a surface microscopic phase separation to achieve the growth of homopores. Furthermore, the as-prepared PVDF membrane displayed high surface porosity and bi-continuous cross-section structure. As expected, a high rejection (over 97%) towards 500 nm polystyrene microparticles could be achieved along with satisfying water flux of 662 L m −2 h −1 bar −1 , which was superior to most current membranes. This work provides not only a new and facile strategy for preparing homoporous membranes employing commercial polymers rather than rarely-obtained block polymers, but a promising alternative for the efficient separation of aquatic microplastics.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 33
·e54288
·
IF 3
Mingguang Zhang,Peifeng Feng,Xiuye Lian,Gang Zhao,Cheng Liu,Nan Li,Jian Xu,Yousi Chen,Xigao Jian
In order to reduce the detection limit and improve the working range of flexible strain sensor, in this article, we reported a multi-walled carbon nanotubes (MWCNTs) and reduced graphene oxide (rGO) co-decorated multifunctional core spurn yarn flexible strain sensor (CGY FSS). It was found that the well lapping between MWCNT and rGO endows sensor with high working range (> 300%), while the helical structure of core-spun yarn makes it sensitive to very tiny deformation (0.1%). To improve its dynamic durability, polydopamine (PDA) was used to improve the interface bonding force between yarn and conductive materials, which ensures the sensor conduct stable electrical signals during 10,000 stretching cycles test at 10% strain. These features made it suitable for human motion detection and structural health monitoring. Moreover, due to the abundant carboxyl groups on the carbon material surface and the employment of polymer-based yarn, CGY FSS also showed good responsiveness to water vapor and acetone gas. It can be conceived that this as prepared strain sensor shows promising potential in smart device application with multiple response mechanism.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 36
·e54322
·
IF 3
Cunyue Wei,Kun Li,Feng Lin,Shengli Mi,Lina Dong,Yu Song,Ting Zhang
Hydrogels are characterized by high water content and are typically used in water environments. However, when used in air environments, hydrogels face limitations due to instability caused by water loss. This study reports the development of PAM/glycerol hydrogels with improved stability. By using water–glycerol bi-solvents to lock in water internally, a closed environment was established to reduce water exchange with the outside world. The hydrogel was made by forming a single PAM crosslinking network using UV crosslinked acrylamide (AM) monomer. The weight of the hydrogel varied by no more than 2% within 6 days, and the visible light transmittance was higher than 90%. In addition, the hydrogel had adjustable refractive index and mechanical properties. The hydrogels with stable performance could be used to fabricate optical lens with practical function in air environment. Meanwhile, the gels also have certain advantages in making a fluid-driven hydrogel actuator with stable performance.
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高影响因子
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