Surfaces and Interfaces
·
2024
·
IF 5.7
Qiyang Guo,Ruixiang Yao,Huili Cheng,Kai Yin,Xiangrong Chen,Yaqing Lu,Ashish Paramane
The strategy of functionalized PS-NPs via PPy (PPy@PS-NPs) forming heterogeneous interface composition is highly efficient in increasing the insulation properties of linear low-density polyethylene (LLDPE). The morphology results show that PPy@PS-NPs are monodispersed in the LLDPE matrix after melting blend, which exhibits unparalleled engineering application value. The electrical insulation results show that PPy@PS-NPs introduced into the LLDPE matrix can reduce its DC electrical conductivity, enhance DC breakdown strength, and inhibit space charge accumulation. When the PPy@PS-NPs concentration is 0.5 wt%, the DC breakdown strength is 35.3 % higher than that of LLDPE. Mechanism research indicates that the depths of carrier traps are decreased due to high electron affinity caused by the introduction of PPy@PS-NPs, but the trap density is increased. The reported strategy of using functionalized polymer nanoparticles to improve the polymer insulation property provides new insights for developing future high-insulation materials and other functional materials based on functionalized polymer nanofillers.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2023
·
IF 3.2
Liu Yuyao,Yao Ruixiang,Tong Yujie,Lu Yaqing,Guo Qiyang
Nanoparticles (NPs), especially inorganic NPs, have been used as fillers to improve the insulation properties of polymers. However, inorganic NPs is difficult to disperse well in polymer matrix, which inhibit the development of insulating nanocomposites for high-voltage direct current power cable. Therefore, it is necessary to improve the dispersion of NPs in the polymer matrix in order to make NPs play a greater role. In this work, polystyrene NPs (PS-NPs) were synthesized and used as fillers to improve the insulation properties of LLDPE. SEM images show that PS-NPs are monodispersed in LLDPE matrix without thermal fusion when the content of PS-NPs is less than 1 wt%. The results of DSC illustrate that the addition of PS-NPs had no effected on thermal behavior of LLDPE. With the introduction of PS-NPs, the DC breakdown strength of LLDPE/PS-NPs is first increased and then decreased. The highest value of 346.5 kV/mm is obtained by PS-0.1 with 0.1 wt% of PS-NPs. The electric conductivity of all LLDPE/PS-NPs composites are decreased comparing with neat LLDPE. Meanwhile, PS-NPs had no significant influence on the dielectric permittivity and dielectric loss of the complex. Therefore, PS-NPs is an alternative option to improve the insulating performance, and our results provide a way for the development of nanocomposites insulating material.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2016
·Vol. 39
·期 2
·448-456
·
IF 2.004
Bing Xue,Huimin Wang,Maosheng Xia,Xingyuan Wang,Kuo Yang,Qianwen Chi,Fangfei Li,Yinshan Jiang
Nacrite nanorolls were prepared by the delamination and rolling of the platy nacrite particles and the nacrite nanorolls were melt-compounded with LLDPE to prepare a novel Nacrite/LLDPE composite. In this method, hexylamine was intercalated into the interlayer space of methoxy-modified nacrite precursor and the deintercalation of nacrite-hexylamine intercalation complex in toluene resulted in the delamination and rolling of nacrite layers. The nacrite nanorolls were composed with linear low-density polyethylene (LLDPE) to prepare a novel Nacrite/LLDPE composite. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N 2 adsorption–desorption test were used to evaluate the prepared nacrite nanorolls. The results showed that the interlayer octahedral surface of nacrite was grafted with methanol and the methoxy-modified nacrite was intercalated with hexylamine. The deintercalation of nacrite-hexylamine intercalation complex in toluene disturbed the orderly arrangement of nacrite layers, leading to a delamination of the layered particles and subsequent formation of aluminosilicate nanorolls. The specific surface area (SSA) and V por value of nacrite nanorolls reached 34.69 m 2 /g and 0.22 cm 3 /g (4.52 m 2 /g and 0.13 cm 3 /g for raw nacrite). Furthermore, the mechanical properties test confirmed that the introduction of nacrite nanorolls into LLDPE matrix could improve the tensile and tear strength. 6.4% and 6.8% higher tensile strength than the pure LLDPE were observed for Nacrite/LLDPE composite with 2 wt% and 4 wt% nacrite nanorolls filler. POLYM. COMPOS., 39:448–456, 2018. © 2016 Society of Plastics Engineers
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
MOLECULES
·
2023
·Vol. 28
·期 13
·4908
·
IF 4.6
Yaqing Lu,Yuyao Liu,Yujie Tong,Huili Cheng,Di Yang,Jiandong Ding,Qiyang Guo
Direct current (DC) power transmission systems have received great attention because it can easily integrate many types of renewable energies and have low energy loss in long-distance and large-capacity power transmission for electricity global sharing. Nanoparticles (NPs) have a positive effect on the insulation properties of polymers, but weak interaction between NPs and polymer matrix greatly decreases the effort of NPs on the enhancement of insulation properties, and thereby limits its engineering application. In this work, grafting strategy was used to link the modified NPs and polymer matrix to improve their interactions. Silica NPs (SiO2-NPs) were modified by 3-(methacrylyloxy) propyl-trimethoxysilane (MPS) to introduce highly active groups on the SiO2-NPs surface, followed by the pre-irradiated linear low-density polyethylene (LLDPE) being easily grafted onto the MPS modified SiO2-NPs (MPS-SiO2-NPs) in the melt blending process to obtain LLDPE-g-MPS-SiO2-NPs nanocomposites. Fourier-transform infrared (FT-IR) spectrum and X-ray photoelectron spectroscopy (XPS) confirm the successful incorporation of MPS into SiO2-NPs. Transmission electron microscopy (TEM) verifies that the modified SiO2-NPs exhibits more uniform distribution. The rheology result shows that the interaction between MPS-SiO2-NPs and LLDPE significantly improves. More importantly, the LLDPE-g-MPS-SiO2-NPs nanocomposites displays superior DC breakdown strength to that fabricated by conventional modification methods. When the addition of MPS-SiO2-NPs is 0.1 wt%, the highest DC breakdown strength values of 525 kV/mm and 372 kV/mm are obtained at 30 °C and 70 °C, respectively, and high DC breakdown strength can be well maintained in a wide loading range of NPs.Keywords:LLDPE;nanocomposites;SiO2;grafting onto;DC breakdown strength
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Shucheng Liu,Bo Li,Xiangxiang Huang,Zhe Kong,Guiqing Cheng,Zhongwei Wang,Qing Yu,Shihui Han,Long Chen
Carbon black/SiO 2 /LLDPE (CB/SiO 2 /LLDPE) is a commonly used polymer material with a positive temperature coefficient (PTC). However, the inferior reproducibility of PTC significantly restricts its service life. The objective of this study is to enhance the PTC reproducibility of CB/SiO 2 /LLDPE material. Polyethylene glycol (PEG) was chosen as the additive, and its effects on SiO 2 dispersion, PTC reproducibility, and electrothermal performance were studied in detail. A more stable SiO 2 /CB synergistic filler network was formed after the incorporation of PEG, which results in a significant improvement in PTC reproducibility. The variation of PTC intensity change rate after 10 heating–cooling cycles decreased by 19.4% after the incorporation of 5 wt% PEG. Additionally, the electrothermal performance of the PEG modified CB/SiO 2 /LLDPE composites was also enhanced with a 15.3°C increase in equilibrium temperature under a DC voltage of 140 V. This study offers an effective strategy for developing high-performance PTC materials.
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
FUEL
·
2024
·
IF 6.7
Mei Ren,Jun Li,Manhong Huang,Donghui Chen,Xuelian Chen,Qi An,Songmei Sun
The escalating environmental issues resulting from waste plastic necessitate innovative decomposition methods that optimize conversion rates and product selectivity. In this study, we demonstrate that linear low-density polyethylene (LLDPE) can be effectively hydrothermolyzed into C1 − C4 compounds with a selectivity of 100 % in the presence of trace water on H-ZSM-5 catalyst under a relatively low temperature of 220 °C. Water plays a dual role here as both a solvent and a reactant. It was found the density of Brønsted acid sites is crucial for LLDPE decomposition, serving as the primary active centers for cracking LLDPE chains. In-situ EPR studies indicate a synergistic mechanism of free radical and carbenium ion pathways in LLDPE depolymerization. Density Functional Theory (DFT) simulations show that the depolymerization starts with the cleavage of a C–C bond in polyethylene, instigated by a hydrogen radical from the Brønsted acid site, leading to various intermediate stages for the formation of tert -butanol, acetone and acetic acid from two potential pathways. The presence of water is crucial in these pathways, aiding bond breakages and the creation of oxygenated products in the Brønsted acid site. This study represents a substantial leap forward in sustainable methodologies for upcycling plastic waste.
研究领域:
环境科学
·
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Yanqin Shi,Yiyi Zhao,Meng Ma,Si Chen,Huiwen He,Yulu Zhu,Xu Wang
For preparing high performance LLDPE film, the photocatalytic activity and the UV absorption capacity of TiO 2 were regulated by the alumina coating content on the surface of TiO 2 . Alumina-coated TiO 2 was prepared by the chemical liquid deposition method, and characterized by element analysis, TGA, FTIR, and morphology observation. The alumina coating layer had been proven to covalently bind to the surface of TiO 2 through Al O Ti bonds, which formed a continuous and dense coating layer, followed by forming a loose flocculent coating layer with the increase of alumina content. The alumina coating layer could significantly reduce the formation of carbonyl group on the LLDPE chains, and enhance UV aging resistance of LLDPE by inhibiting the photocatalytic activity of TiO 2 . Moreover, the dispersion of alumina-coated TiO 2 in the LLDPE matrix was improved. Thus, the transmittance of LLDPE/alumina-coated TiO 2 composites was reduced and the whiteness was improved. Importantly, the continuous and dense alumina coating layer was enough to inhibit the photocatalysis effect of TiO 2 on LLDPE. The further increase of alumina coating content reduced the UV absorption capacity of alumina-coated TiO 2 and its compatibility with the LLDPE matrix. Therefore, the best alumina coating content on the surface of TiO 2 was 1.46 wt% for preparing high performance LLDPE/TiO 2 composites. Highlights Alumina-coated TiO 2 with controllable coating thickness was successfully synthesized. LLDPE/alumina-coated TiO 2 has excellent UV aging resistance and mechanical properties. The photocatalytic activity and UV absorption capacity of TiO 2 could be regulated. 1.46 wt% of alumina coating is the best content for high performance LLDPE/TiO 2 composites.
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
Polymers
·
2022
·Vol. 15
·期 1
·32
·
IF 4.967
Xiangyao Li,Jie Zhang,Chengchao Liu,Wenmin Mu,Zhe Kong,Yan Li,Zhongwei Wang,Qing Yu,Guiqing Cheng,Long Chen
Polyolefin suffers from degradation during processing and application. To prolong the service life, antioxidants are needed in the packing formula of polyolefin products. The usage of natural antioxidants could avoid potential health hazards aroused by synthetic ones. Pine needles have long lives and hardly rot, suggesting their high resistance to degradation. To provide a new candidate of natural antioxidants and add more value to pine needles, pine needle extracts (PNE) were investigated as the antioxidant of linear low-density polyethylene (LLDPE). PNE-modified LLDPE (PE-PNE) exhibited much better short-term and long-term aging resistance than pure LLDPE (PE): Oxidation induction time (OIT) of PE-PNE was 52 times higher than that of PE, and the increments of carbonyl index (CI) of PE-PNE-1st samples placed under daylight and in the dark were approximately 75% and 63% of PE under the same conditions. It could be attributed to the attractive antioxidant capacity of PNE (IC50of DPPH radical scavenging was 115 μg/mL). In addition, the PE-PNE sample showed high processing stability and maintenance of the mechanical property during multiple extrusions: only a 0.2 g/10 min decrease in melting flow rate was found after five extrusions; the tensile strength and elongation at break were almost unchanged. All results reveal that pine needle extracts could play a role in LLDPE stabilization. Moreover, as pine needles are mainly considered a kind of waste, the present study would benefit the budget-reducing polyolefin industry.Keywords:natural;antioxidant;polyethylene;application
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 30
·e54102
·
IF 3
Pengwei Wu,Jie Liu,Song Wang,Sanxi Li,Tao Tang
Organically modified montmorillonite (OMMT) and Ni 2 O 3 were simultaneously introduced into flame-retardant linear low-density polyethylene/ethylene-vinyl acetate/magnesium hydroxide (LEM) composites. Compared with the LEM composite, the thermal stability, and tensile properties of LEM/ remained basically unchanged when 5 wt% of OMMT/Ni 2 O 3 was substituted for MH. The LOI value increased a little from 27.2 to 27.7%. The data from cone calorimeter test showed that the first and second peak heat release rate was reduced by 19% and 67%, respectively. The total heat release and total smoke production showed a significant reduction by 18% and 36% after incorporation of OMMT/Ni 2 O 3 , respectively. The mechanism study indicated that the combination of OMMT/Ni 2 O 3 cooperates promote the carbonization of the polymer itself into carbon naotubes, which form a more cohesive char layer with magnesium hydroxide during combustion. This is the core factor responsible for the synergistic effect on reducing the heat release and smoke production in the LEM composite.
研究领域:
材料科学
·
高分子化学
·
燃烧学
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Bo Cao,Yubin Zhou,Yancheng Wu,Jianan Cai,Xiaoxiao Guan,Shumei Liu,Jianqing Zhao,Mingqiu Zhang
Processability and toughness are crucial to the industrial production of highly filled polymer-based composites. In this work, a strategy is proposed for simultaneously improving the processability and toughness of highly filled magnesium hydroxide (MH)/linear low-density polyethylene (LLDPE) composites with the aid of flow modifiers. Fluorine-containing flow modifiers (PMFs) with low surface energy are located at the MH/LLDPE interface, leading to relatively homogeneous dispersion of the fillers. The torque value of the MH/LLDPE (80:20 by weight) composite with 5 wt% PMF (20.2 N·m) is less than that of the unmodified MH/LLDPE (29.8 N·m), while the corresponding impact strength increases from 1.93 kJ/m 2 to 3.15 kJ/m 2 . Rheological studies further verify that PMF is able to reduce the melt viscosity of highly filled MH/LLDPE composites, originating from the reduction in molecular chain entanglement and the improvement in molecular chain mobility, which are the core factors responsible for the overall enhancement of properties.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Yuxin Zuo,Wenjie Wei,Yaran Wang,Shen Wang,Zhongjun Wang,Yu Shu,Zhiqi Liu
Linear low-density polyethylene (LLDPE) films have garnered significant attention. However, their poor thermal insulation properties and limited functionality severely restrict applications. This study prepared an LDH/LLDPE composite film (LD-1.5%K) with excellent optical properties and high-performance infrared insulation by blending γ-(methacryloyloxy) propyltrimethoxysilane (KH570) dry-modified layered double hydroxide (D200) with LLDPE. D200 exhibits a refractive index close to LLDPE. Its incorporation significantly reduces the average infrared transmittance of LLDPE films. Surface modification of D200 with KH570 promotes uniform blending with LLDPE. As a result, the LD-1.5%K film delivers outstanding optical properties (high visible light average transmittance of 90.8%, and low haze of 23.5%) The film also achieves low infrared average transmittance. This low infrared transmittance endows LD-1.5%K film with excellent heat retention (up to 4°C) and recyclable stability. Consequently, this approach promotes crop growth and offers good economic value. Applying LD-1.5%K in areas with strong ultraviolet radiation and cold climates is effective. It provides a promising solution for future cultivation in harsh environments.
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2026
·
IF 8.9
Kailing Shao,Yongkun Yuan,Jiahui Zou,Xiangdong Chen,Dezhi Kong
Due to increasing road traffic and the frequency of complex climatic conditions, issues such as low-temperature cracking and high-temperature rutting in asphalt pavements have become more severe. Therefore, it is imperative to explore effective methods to enhance pavement performance and extend service life of asphalt pavements. In this research, the reversible characteristics of dynamic disulfide bonds were introduced into styrene-butadiene-styrene (SBS) and linear low-density polyethylene (LLDPE), respectively, to produce modified polymers SBS-g-HD and PE-g-HD. Modified asphalt samples were prepared by incorporating the two modifiers at different ratios to systematically investigate the influence of modifier type and content on asphalt properties. The conventional physical properties of the asphalt, including penetration, ductility, softening point, and viscosity were characterized. In addition, the rheological behavior and thermal stability of the binders were evaluated through thermogravimetric analysis (TGA) tests, dynamic shear rheometry (DSR) tests, and bending beam rheometer (BBR) tests. Compared to BA, the modified binder exhibited reduced penetration and ductility, but increased softening point and viscosity. Among the modifiers, PE-g-HD enhanced high-temperature performance, while SBS-g-HD improved low-temperature properties. Their combination resulted in balanced performance over a wide temperature range. At 135 °C, the viscosity of PSHA-3 increased by 1.152 Pa s and 0.46 Pa s compared with that of SHA and PHA, respectively. At −12 °C, PSHA-2 exhibited a 32.2% decrease in S-value compared to PHA. Meanwhile, the improved compatibility of SBS-g-HD and PE-g-HD with asphalt was studied, with the mechanism investigated by molecular dynamics (MD) simulation.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）