Polymers
·
2019
·Vol. 11
·期 12
·2048
·
IF 3.164
Qinrui Zhu,Dagang Li
Interface optimization in preparing natural fiber based biocomposite becomes a key factor that determines overall properties, especially mechanical performance. The solution for upgrading interfacial adhesion stemmed from polar fiber and nonpolar polymer remains unclear. Here, a kind of pulp fiber/acrylonitrile-butadiene-styrene (ABS) composite with content ratio of 1:1 was fabricated by functionalizing the cellulose fiber to coordinate interaction between fiber and ABS. With addition of 5 wt % polyacrylamide (PAM) there existed an interlinked three-element structure in composite. Three types of treatment to cellulose fiber, including alkali immersion, pivaloyl chloride grafting for 10 h and 20 h were conducted. Pulp fiber that was treated with alkali for one hour, followed by pivaloyl chloride reaction for ten hours, proved to be effective for interfacial adhesion. X-ray Photoelectron Spectroscopy (XPS) analysis reveals 21.9% of carbonyl and 12.1% of ester function in this fiber, which corresponds to oxidation and grafting. For its composite SEM picture displays that most of cellulose fiber are rooted in ABS and evident traces of tearing or fracture can be observed after tension test. DMA test indicates that this modified pulp fiber/ABS composite exhibits great compatibility, because of combined loss modulus peak ranging from 80 °C to 100 °C. Moreover, the well miscible composite has a tensile strength of 58.1 MPa and elastic modulus of 2515 MPa, increasing by nearly 50% and 60% from those of pure ABS, respectively.Keywords:ABS;modification;interfacial adhesion;compatibility;interlinked structure
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2020
·
IF 6.513
Furong Hou,Liang He,Xiaobin Ma,Danli Wang,Tian Ding,Xingqian Ye,Donghong Liu
In order to evaluate the effect of ultrasound to chitinase from a molecular level, atomic force microscopy (AFM) was employed to investigate the interaction force of chitinase binding onto chitin surface. In the measurement of force-distance curve, a series of pull-off events were discovered using the immobilized AFM tips with chitinase either treated by ultrasound or not, whereas no interaction peak was observed by the AFM tips without chitinase, indicating that the obtained adhesion forces were coming from the binding functions between chitinase and chitin. Through the analysis of these force curves, at the loading velocity of 0.3 μm/s, the maximum binding force of the chitinase treated by ultrasound for 20 min onto chitin was measured to be 105.33 ± 23.51 pN, while the untreated onto chitin was 71.05 ± 12.73 pN, suggesting the stronger binding force between ultrasonic treated chitinase and chitin substrate. Therefore, AFM has provided a useful method to directly and quantitatively characterize the interactions between chitinase and chitin, and successfully proved that ultrasound could activate chitinase by enhancing the binding ability of chitinase onto chitin.
研究领域:
生物物理学
·
酶学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Yadong Wu,Zian Wang,Lingyun Xu,Haopeng Wang,Shuqiang Peng,Longhui Zheng,Zhi Yang,Lixin Wu,Jia-Tao Miao
A facile method to prepare silver-plated carbon nanotubes (CNTs)/carbon fiber (CF) hybrid fibers that shows significant mechanical properties enhancement functions was proposed. In this method, abundant CNTs were evenly deposited on the CF surface by freeze-drying deposition and tightly attached to the CF surface by the following sizing process. The Ag@CNTs network on the CF surface significantly enhanced the wettability of the hybrid fibers and increased the interfacial mechanical interlocking between the fiber and matrix, thus significantly enhancing the properties of the CFRP composites. Compared with the untreated CF/EP composites, the interlaminar shear strength (ILSS), flexural strength, impact strength, thermal conductivity, and the electrical conductivity in the thickness direction of the C-CF-Ag@CNTs/EP composites were increased by 54.7%, 62.7%, 107.2%, 37.5% and 385.8%, respectively. Such a simple and effective method of preparing silver-plated CNTs/CF hybrid fibers provides great potential in industrial applications.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2017
·
IF 3.11
Guangmei Huang,Zhiyun Du,Zuoying Yuan,Lihua Gu,Qing Cai,Xiaoping Yang
Biodegradable organic-inorganic composites composed of polylactide (PLA) and hydroxyapatite (HA) are important bone repairing materials, while the dispersibility of nanoscaled HA in PLA and the interfacial adhesion between HA and PLA remained unsatisfactory. In this study, poly(D-lactide) (PDLA) oligomers with different molecular weights were grafted onto HA nanorods (HA-PDLA), and the HA-PDLA hybrids were mixed with poly(L-lactide) (PLLA). Dispersibility of HA-PDLA hybrids in PLLA matrix was investigated, and the formation of PDLA/PLLA stereocomplex at the interface of HA-PDLA and PLLA was studied by characterizations including crystallization, mechanical and thermal properties, taking PLLA grafted HA (HA-PLLA) and unmodified HA as comparisons. Surface grafting of PLLA or PDLA oligomers both significantly improved the dispersibility of HA nanorods in PLLA matrix. Benefiting from PDLA/PLLA stereocomplexation, HA-PDLA could increase the tensile strength and the elongation of resulting PLLA/HA nanocomposites more significantly than HA-PLLA. The interfacial interaction between HA-PDLA and PLLA matrix could be further strengthened by increasing the molecular weights of those grafted PDLA chains on HA, which was verified by changes in crystallization and glass transition behaviors. To sum up, the concept of using PDLA/PLLA stereocomplexation was feasible and effective in preparing PLA-based organic-inorganic nanocomposites targeting bone repairing.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Mingyong Jia,Qianshun Cui,Yueqi Wu,Chengquan Shen,Qiang Shen,Fei Chen
Given the insufficient wettability and compatibility between ceramic and metal, heterogeneous grain boundaries in particular composites consistently represent the primary failure sites related to both mechanical loading and chemical corrosion. To solve as above–mentioned problem and improve the interfacial bonding of ceramic/metal composites, we performed a novel strategy to modify the grain boundaries of AlN/Mo composites via Ni nanoparticles , which was produced via rotary chemical vapor deposition . Without sacrificing ductility, a substantial 46.1 % increase in bending strength was successful attained arises from the combined influence of grain boundary density and diffusion depth, interfacial structure and electronic properties. In view of the limitations of the traditional blending methods, this study made full use of random nucleation characteristics during the oxidation/reduction process in RCVD to form uniform nanoparticle coating on the surface of AlN powder, thereby avoiding potential risks to AlN/Mo composites, such as brittle intermetallic compounds , localized performance variations.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2020
·
IF 2.65
Xiaoyu Shi,Shengnan Bai,Yuanyuan Li,Xiaoyan Yu,Kimiyoshi Naito,Qingxin Zhang
Nanodiamond (ND) was surface modified by polyethylene glycol (PEG) to improve the interfacial adhesion between ND and the polylactic acid (PLA) matrix and achieve uniform nanoparticle dispersion in the matrix. PEG functionalized ND (ND-PEG) was successfully prepared by a novel and scalable modification method. Firstly, the ND particles oxidized by air was treated with dopamine, and then the hydroxyl groups on PEG and polydopamine (PDA) were covalently linked by isocyanate groups . The Fourier Transform Infrared spectroscopy, Thermogravimetric analysis and X-ray photoelectron spectroscopy reveal that PEG has been covalently boned on the surface of ND. Compared with those of pure PLA film, the tensile strength , tensile modulus and elongation at break of the nanocomposite films with PEG modified ND increase by 66.64%, 37.6% and 187.43%, respectively. In the meantime, the degradation temperature at the initial stage and the temperature at the maximum weight loss rate of the nanocomposite films are significantly increased. It is suggested that the incorporation of ND-PEG into PLA matrix is an effective method to improve the mechanical properties and thermal stability of PLA.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Peng Wang,Xiyao Kong,Dongpeng Mao,Chengye Wang,Meina Hu,Kailei Shang,Yunxian Piao
Nanoplastics, which ubiquitously present in wide variety of water bodies, pose a serious threat to human health due to nanoscale size, toxicity, and persistence. Therefore, it is urgently necessary to develop appropriate adsorbents with features of strong capability of nanoplastics capturing and easy separation. In this regard, through decorating biodegradable and functional groups rich humic acids on porous magnetic biochar nanoparticles that prepared at lower pyrolysis temperature (400℃), the environmental friendly adsorbent (HAs/γ-Fe 2 O 3 /PNBC) was prepared. It was revealed that 100 mg/L of high concentration leveled nanoplastics with amino modification were near completely removed in 2 h, and the maximum capture capacities reached 1633.99 – 2105.26 mg/g at 10, 25 and 40 ℃, which was significant improvement compared to current researches. Also superior adsorption efficiencies were maintained at varying pH and ionic strength conditions. By mechanism study the attachment between HAs/γ-Fe 2 O 3 /PNBC and nanoplastics was revealed to be driven by electrostatic interaction, hydrogen bond, π–π interaction and complexation. Furthermore, the adequate binding sites and highly negative charging provided by rich humic acids which attaching on porous interface of nano biochar synergistically realized multilayer sorption. Overall, an extraordinary effective, environmental friendly and cost effective adsorbent was facially created using easy accessible natural materials, which has pronounced potential to decontaminate large scaled nanoplastics polluted water bodies.
研究领域:
环境科学
·
纳米毒理学
·
水处理技术
·
界面化学
·
环境污染与控制
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 5
·
IF 1.866
Ming Ye,Nianqing Zhu,Xiaojie Li,Zhongbin Ni,Zhuowei Qiu,Mingqing Chen
A novel monofunctional compatibilizer (OID) was prepared and used as compatibilizer for fabrication of wood-plastic composites. OID was successfully synthesized by esterification reaction of isophorone diisocyanate and octadecanol as confirmed by Fourier transform-infrared spectra. After OID modification, the hydrophobicity of wood flour surface was enhanced as indicated by the increase of surface water contact angle. By using OID as compatibilizer, an obvious enhancement of the interfacial adhesion between wood flour and polyolefin was observed by scanning electron microscopy. As a result, the tensile properties of the obtained polypropylene/wood flour composites and polyethylene/wood flour composites were significantly enhanced. Besides, the processability of polyolefin/wood flour composites was also improved by adding OID. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44429.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xiguang Zhang,Zhanjian Liu,Xiaoying Zhang,Yuan Li,Huaiyuan Wang,Jingtao Wang,Yanji Zhu
This work presents the preparation of durable superhydrophobic polyethersulfone (PES) composite coating with large water contact angle of 157.2 ± 1.3° and small sliding angle of 3 ± 0.5°. The interface bonding force between PES and SiO 2 nanoparticles was enhanced through the dopamine self-polymerization on the surfaces of PES particles during the sol-gel process. After surface modification with 1 H ,1 H ,2 H ,2 H -perfluorooctyltriethoxysilane (POTS), superhydrophobic PES-PDA-SiO 2 -POTS coating was easily prepared by a simple one-step spraying method with less than 2.6 wt% SiO 2 . The dosage of nanoparticles to establish micro/nano structures for superhydrophobic coating was much less than the previously reported, which is beneficial to improve the interface bonding force between PES and SiO 2 . The prepared coating can still remain superhydrophobicity even after 84 h of immersion in a 3.5 wt% NaCl solution. The durable superhydrophobicity was mainly attributed to the litchi-like structure that trapped more air to effectively prevent water infiltration. Combined with the high interface bonding force of PES-SiO 2 and the low concentration of SiO 2 , the adhesive ability of the coatings accorded with Grade 0 of GB/T9286, which represented the best adhesive strength. In addition, the wear life of the PES-PDA-SiO 2 -POTS coating was prolonged to 8 times than that of PES/SiO 2 /POTS coating. Potentiodynamic polarization plots indicated that the coating had great corrosion resistance , low corrosion current density of 9 × 10 −9 A/cm 2 and high corrosion protection effect of 99.99%. The superhydrophobic PES-PDA-SiO 2 -POTS coating can be also highly applied on different substrates. It is believed the PES-PDA-SiO 2 -POTS coating may have great potential for large-scale applications.
研究领域:
材料科学
·
表面工程
·
腐蚀防护
·
高分子化学
·
纳米复合材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Han Feng,Ping Liu,Xu Guo,Junliang Li,Yifan Sun,Shunge Wu,Ruohai Hu,Zhi Liu,Helei Tian,Yuanming Ma,Caixia Liu,Houzhu Huang,Fei Teng,Xinyue Tang,Austin Yang,Aiguo Song,Xiaoming Yang,Ying Huang
Flexible resistive sensors based on crack structures have been widely studied in the field of electronic skin and health monitoring. However, it is still a challenge to develop resistive sensors with strong interface bonding forces due to the problem that the sensitive layer of traditional cracked sensors falls off easily. This paper reports a new type of graphene-based resistive sensor, which uses modified poly(sodium 4-phenylene sulfonate) and graphene nanosheets to prepare a highly conductive, fragile, film sensitive layer. Siloxane at the end of modified poly(sodium 4-phenylene sulfonate) is used to enhance the interface between the sensitive layer and the silicone rubber layer to prepare a flexible resistive sensor with a crack structure. The sensor has a high sensitivity (gauge factor up to 21980.28) and a high response speed (∼65 ms), with an effective working range of 0–4.7 % strain. The sensor has been successfully applied to human physiological signal detection. The neural network algorithm successfully predicted the corresponding blood pressure based on the pulse wave signal detected by the sensor. The average error of systolic blood pressure and diastolic blood pressure was 0.79 and 0.42 mmHg, and the error of ± 5 mmHg accounted for 91.2 % and 94.3 % of the total, respectively. The error value passed the Association for the Advancement of Medical Instrumentation standard, and reached the Class A standard of British Hypertension Society.
研究领域:
材料科学
·
生物医学工程
·
电子皮肤技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2021
·
IF 7.991
Tianyi Feng,Bangbang Liang,Hongyan Bi,Yingchao Han
A sandwich-structure like electrospun membrane of polylactic acid (PLA)/nano-hydroxyapatite (nHAP) and polyvinyl alcohol (PVA)/sodium alginate (SA)/nHAP was fabricated for skull defect repair. By controlling the number of repeated AB (A: hydrophobic layer of PLA/nHAP; B: hydrophilic layer of PVA/SA/nHAP) units with a fixed thickness, ABA and BAB sandwich-like structures were constructed to improve the integration of hydrophobic and hydrophilic layers. The results show that the ABA sandwich-like structure played a dominant role in the interface fusion. The tensile strength and interface bonding force were obviously enhanced, which was attributed to the fiber entanglement. Compared to the PLA/nHAP membrane, the composite membrane showed significantly improved water absorption capacity. In vitro and in vivo experiments showed that the composite membrane had good biocompatibility and promoted the repair of skull defects. Therefore, the proposed sandwich-like structure is a feasible strategy to facilitate the adhesion of hydrophobic and hydrophilic fibers in electrospun membranes and to achieve a properly-integrated membrane for tissue defect repair.
研究领域:
材料科学
·
生物医学工程
·
组织工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2016
·
IF 3.897
Shuyan Yang,Hongbo Fan,Yuanqi Jiao,Zhuodi Cai,Peng Zhang,Yangping Li
The mechanical properties and the possible micro-structure of nitrile-butadiene rubber/lithium perchlorate/polyhedral oligomeric silsesquioxane (NBR/LiClO 4 /POSS) nanocomposites have been investigated thoroughly. The interactions among Li + cations, CN groups and C O C groups bring in a novel network structure consisting of several kinds of effective crosslinks, causing an increase in the glass transition temperature of POSS, as well as in the crosslink contribution ( G c ) and the constraint contribution ( G e ), which facilitates strong interface cohesion between POSS and NBR matrix and a well dispersion of POSS. The addition of POSS not only increases the crosslinking density of NBR/LiClO 4 /POSS nanocomposites , but also improves the 300% modulus and tensile strength greatly. Therefore, a possible micro-structure has been proposed to express the experimental observation.
研究领域:
材料科学
·
高分子科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）