Article
Polymer Science
Haichao Meng, Long Ni, Cuiqing Zhou, Chen Qiu, Yinfu Luo, Huawei Zou, Shengtai Zhou, Mei Liang
Summary: Rigid polyimide foams (PIFs) with good mechanical properties and thermal resistance were successfully fabricated through thermal foaming of polyester ammonium salt precursors with the addition of a pararosaniline base as a crosslinker. The crosslinked structure derived from the base improved melt viscosity and provided sufficient strength to prevent shrinkage, leading to enhanced compressive properties. The PIFs exhibited a 6.6 to 7.9 times increase in compressive strength compared to regular polyimide foams, and their thermal properties were also excellent.
Article
Materials Science, Composites
Abdirahman A. Yussuf, Mohammad A. Al-Saleh, Salah T. Al-Enezi, Gils Abraham
Summary: In this study, linear low density polyethylene (LLDPE) was grafted and crosslinked using reactive extrusion melt compounding with different silane concentrations and the presence of montmorillonite (MMT) nanoclay. The results showed that increasing silane concentration led to higher gel content, tensile strength, and Young's modulus in crosslinked LLDPE samples. Additionally, the addition of nanoclay filler enhanced the mechanical properties and thermal stability of the crosslinked LLDPE.
POLYMER COMPOSITES
(2021)
Article
Materials Science, Multidisciplinary
Manjunath Shettar, Meet Doshi, Ayush Kumar Rawat
Summary: The study aims to fabricate and characterize polyester-nanoclay nanocomposites with improved mechanical properties and wear resistance by adding nanoclay, thus reducing water uptake. The causes of specimen failure are investigated using scanning electron microscopy images, and a wear test is conducted to analyze the influence of various factors on wear property. The addition of nanoclay is found to enhance the wear resistance of polyester.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Multidisciplinary
R. Ravandi, S. Zeinali Heris, S. Hemmati, S. Davaran
Summary: The aim of this research was to develop a self-healing dental nanocomposite and evaluate its mechanical properties, crack-healing, and self-healing longevity after water aging. Nanocapsules were synthesized as they are biocompatible for dental materials, and nanoclay was used as a filler to improve mechanical properties. The results showed that incorporating nanocapsules into the nanocomposite increased mechanical properties and achieved good self-healing efficiency, which was not affected by water aging.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Jindong Huang, Hong Chen, Guanglu Zhang, Xiaowei Fan, Juncheng Liu
Summary: The effects of the dosage of silane coupling agent KH-560 on the structure and performance of PI/SiO2 composite film were investigated. The results show that the addition of KH-560 increases the transmittance and thermal stability of the sample but has little effect on its ability to resist ultraviolet radiation.
Article
Engineering, Multidisciplinary
Ting Wu, Wen-hua Xu, Hai-fei Zhong, Yu Du, Heng Xie, Jin-ping Qu
Summary: This study proposes an efficient method for the preparation of polyethylene/multiwall carbon nanotubes composite foam. By combining melt blending and sacrificial template, a three-dimensional interconnected structure is achieved. The composite foam shows ultra-low reflectance and high evaporation efficiency under solar irradiation. Additionally, it significantly reduces the salinity of water.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Construction & Building Technology
Brahim Mazian, Eric Wirquin, Kawther Aguibi, Patrick Martin, Ludovic Chaveriat, Vincent Dubois
Summary: Mineral foam concretes are lightweight concretes that have air voids due to the use of a foaming agent. The properties of these concretes depend on factors such as foam quantity, water/binder ratio, and mixing conditions. This study investigated the impact of mixing conditions on foam performance and found that increasing stirring rate and time decreases foam density, while increasing water/binder ratio increases density and mechanical properties but decreases thermal properties.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Polymer Science
Fangjun Liu, Chenxi Shen, XueLiang Jiang, Feng You, Chu Yao, Yecheng Shangguan
Summary: In this study, high melt strength polypropylene (HMSPP) was successfully fabricated using the melting grafting technique. The introduction of TMPTA improved the melt strength, mechanical properties, thermal stability, and foaming properties of polypropylene.
Article
Materials Science, Textiles
Beyzanur Gunaydin, Aybeniz Seyhan, Yusuf Polat, Ali Kilic, Ali Demir, Mustafa Erdem Ureyen, Huseyin Avci
Summary: This study presents the production of flame retardant polyethylene (PE) fibers through a modified spinning line. The fibers were characterized using SEM, TGA, LOI, MCC, and tensile tests. It was found that the addition of an organic phosphorus additive and hot drawing process improved the flame retardancy and mechanical properties of the fibers.
JOURNAL OF INDUSTRIAL TEXTILES
(2022)
Article
Polymer Science
Guowei Chen, Ali Vahidifar, Steven Yu, Tizazu H. Mekonnen
Summary: This study evaluates and develops an environmentally-friendly and sulfur-free cured EPDM composite by incorporating silica into silane grafted EPDM (SiEPDM) composites. The results show that a robust bonding between silica and grafted silane is established, resulting in a crosslinking network within the composite structure. The optimized SiEPDM-silica composites exhibit significantly improved tensile strength and tear strength compared to EPDM-silica composites. Additionally, the SiEPDM-silica composites demonstrate exceptional UV stability.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Odelia Levana, Ji Hoon Jeong, Sung Sik Hur, Wonbin Seo, Minho Lee, Kyung Mu Noh, Soonkook Hong, Jae Hong Park, Ju Hun Lee, Chulmin Choi, Yongsung Hwang
Summary: In this study, an antibacterial surface composed of thermoplastic poly-urethane (TPU) embedded with bentonite and MMT clay containing quaternary ammonium salts (QAS) was developed to prevent bacterial adhesion. The results showed that the nanoclay-embedded TPU surfaces with QAS significantly reduced the adhesion of E. coli and S. aureus, and a higher nanoclay concentration enhanced the effectiveness.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Polymer Science
Liang Chang, Yuanwu Wang, Xueqi Chen, Yiping Ren, Xiaoxi Luo
Summary: The effect of grafting conditions on the surface properties of silane-treated veneer was analyzed by treating poplar veneer with silane coupling agents under different heating conditions. The results showed that heating conditions were necessary for the conversion of physically adsorbed silanols into covalent -Si-O-C- bonds, improving bonding strength. The tensile shear strength of plywood reached 1.03 MPa when the veneer was grafted at 120℃ for 90 min, meeting outdoor material requirements. Enhanced interlock and improved thermal stability were observed under the optimal grafting condition.
Article
Polymer Science
Constantinos J. Revelas, Aristotelis P. Sgouros, Apostolos T. Lakkas, Doros N. Theodorou
Summary: We have developed a three-dimensional self-consistent field-theoretic approach (3D-SCFT) to study polymer matrix nano composites with different geometries. By using the finite element method (FEM), we discretized Edwards's diffusion equation in space and time. The accuracy of the smearing approximation (SA), which treats grafting points as delocalized across a spherical shell, was assessed by comparing it with the 3D-SCFT. The SA is able to reproduce important structural and thermodynamic properties of the nano composites, but deviations are observed in the mushroom regime. The 3D-SCFT, which fixes grafting points in space, provides a more accurate description of chain stretching and offers detailed visualization of the brush transition.
Article
Engineering, Environmental
Ting Wu, Wen-hua Xu, Kang Guo, Heng Xie, Jin-ping Qu
Summary: The study proposes an efficient method to fabricate superhydrophobic polyethylene foam with high porosity and exceptional durability. The foam maintains superhydrophobic properties under water pressure and flow impact, demonstrating excellent mechanical performance and potential for various applications.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Composites
Hariharasakthisudhan Ponnarengan, Logesh Kamaraj, Surya Rajan Balachandran, Sathickbasha Kathar Basha
Summary: In this research, the addition of 3% nanoclay in the epoxy resin was found to enhance the overall mechanical properties of glass-reinforced aluminum laminates, while more than 3% nanoclay resulted in a deterioration in mechanical properties. The mechanical properties of fiber metal laminates with nanoclay filler were compared to other fillers in previous studies, showing that nanoclay filler produced significantly better results.
POLYMER COMPOSITES
(2021)