POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 26
·期 11
·1351-1355
·
IF 1.757
Deming Zeng,Jian Lv,Chun Wei,Chuanbai Yu
Sisal is a natural material and a potential additive to reinforce composites. In this paper, sisal fiber cellulose microcrystalline (SFCM) was obtained from sisal fiber, and SFCM/unsaturated polyester (SFCM/UPR) in-situ resins were prepared via in-situ polymerization. Moreover, SFCM/UPR composites were produced with methods of rolling and molding. Effect of SFCM on dynamic mechanical properties of composites was studied. It is demonstrated that SFCM could significantly improve the dynamic mechanical properties of composites; the effect is closely related with the amount of SFCM, its dispersion in UPR matrix, and interfacial interaction. When the content of SFCM was 3 wt%, at 50°C, the storage modulus of SFCM/UPR composite was 33.22% higher than that of pure UPR. In addition, the glass transition temperature (T g ) was shifted to a higher temperature by 7.5°C, and loss modulus was decreased by 16.24%. The equilibrium value of relaxation modulus at 120 min was 30.52% higher than that of pure UPR composite. Besides, the equilibrium value of creep strain at 120 min was decreased by 41.61% compared with pure UPR composite. Copyright © 2015 John Wiley & Sons, Ltd.
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
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 12
·1-9
·
IF 3.097
Li Mengqing,Zhang Yudong,Zhu Fang,Zhao Xinrui,Li Runming,Wang Hongxia,Liu Jichun,Li Xiying,Chang Haibo,Lin Tong
Poly(ε-caprolactone) ( PCL)/polyamide 6 (PA6) composites were fabricated by dispersing PA6 powder into PCL. The SEM results show good dispersion of PA6 in the PCL matrix. Crystallization behavior, crystal structure and spherulitic morphology of pure PCL and the PCL/PA6 composites, as well as their thermal stability and dynamic mechanical properties, were characterized using various techniques including differential scanning calorimeter, X-ray diffraction (XRD), polarized light microscope (PLM), thermal gravimetric analysis (TGA) and dynamic mechanical analyzer (DMA). The PCL/PA6 composite showed increased storage modulus and glass transition temperature (T g ). PA6 powder functions as a heterogeneous nucleate to promote PCL crystallization but does not alter orthorhombic crystal form, crystallization mechanism and thermal stability of PCL.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Yihui Xu,Yudong Liu,Ling Liu,Jun Liu
The blending of different elastomers can greatly broaden the application range of rubber materials. However, due to the poor compatibility between polar elastomers and non-polar elastomers, severe phase separation occurs during the blending process, which severely degrades their processing performance and mechanical properties. In this paper, we prepared SBR-P/XNBR blends by emulsion blending polar modified styrene-butadiene rubber (SBR-P) latex with carboxylated nitrile rubber (XNBR) latex. The effects of the blending ratios on the vulcanization behavior, mechanical strength, dynamic mechanical properties, and oil resistance of the rubber compounds were studied. Experimental results showed that the mechanical strength and oil resistance of the modified SBR-P/XNBR blends are significantly higher than the unmodified SBR and XNBR blends. The dynamic mechanical analysis curve results of the rubber compounds showed that SBR-P has good compatibility with XNBR. With the increasing addition of XNBR, the oil resistance of the rubber compounds improves, and the solvent adsorption is reduced by over 60%.This study proposes a solution for utilizing non-polar rubbers, which are typically not oil-resistant, in oily environments. The proposed solution enables the preparation of composites with excellent mechanical properties in such environments.
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
REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Lijie Qu,Yanlong Sui,Chunling Zhang,Peihong Li,Xueyan Dai,Baosheng Xu
To construct effective interfacial interactions between graphene-based flame retardants and epoxy resin (EP) matrixes, reactive cyclophosphazene was chemically synthesized with amino groups and grafted on graphene oxide (GO) to prepare a flame-retardant fGO nanosheets for EP nanocomposites. The obtained fGO presented good compatibility and endowed the composites with improved thermal stability and dynamic mechanical properties. With a low content of 1.0 wt.% fGO added, the EP nanocomposites exhibited distinctly lowered the peak of heat release rate, total heat release, and total smoke production by 49.0%, 21.1%, and 51.9%. Compact char residue layers and suppressed volatile products indicated the formation of protective char structures derived from fGO nanofillers. The flame-retardant mechanisms were investigated and ascribed to the effects in condensed and gas phases from phosphazene modified graphene components.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 5
·916
·
IF 3.06
Qinghong Hu,Yan Chen,Jiaoling Hong,Shan Jin,Guangjin Zou,Ling Chen,Da-Zhu Chen
Microencapsulated phase change materials (MicroPCMs)-incorporated in epoxy composites have drawn increasing interest due to their promising application potential in the fields of thermal energy storage and temperature regulation. However, the study on the effect of MicroPCMs on their microstructure, thermal and viscoelastic properties is quite limited. Herein, a new type of smart epoxy composite incorporated with polyurea (PU)-shelled MicroPCMs was fabricated via solution casting method. Field emission-scanning electron microscope (FE-SEM) images revealed that the MicroPCMs were uniformly distributed in the epoxy matrix. The thermal stabilities, conductivities, phase change properties, and dynamic mechanical behaviors of the composite were studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), thermal constant analyzer and infrared thermography. The results suggested that the heat storage ability of the composites was improved by increasing the MicroPCMs content. The thermal stability of MicroPCMs was found to be enhanced after incorporation into the matrix, and the MicroPCMs-incorporated epoxy composites showed a good thermal cycling reliability. Moreover, the incorporation of MicroPCMs reduced the composites’ storage modulus but increased the glass transition temperature (Tg) as a result of their restriction to the chain motion of epoxy resin. Besides, a less marked heating effect for the composite was explored through infrared thermography analysis, demonstrating the good prospect for temperature regulation application.Keywords:phase change materials;microcapsules;epoxy composites;dynamic mechanical properties;thermal regulation
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 133
·期 37
·
IF 1.866
Peng Wang,Fusheng Yang,Liang Li,Zaisheng Cai
Two phosphorus-containing phenolic amines, a 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-based derivative (DAP) by covalently bonding DOPO and imine (SB) obtained from the condensation of p -phenylenediamine with salicylaldehyde, and its analog (AP) via the addition reaction between diethyl phosphite and SB, were used to prepare flame-retardant epoxy resins. The burning behaviors and dynamic mechanical properties of epoxy thermosets were studied by limited oxygen index (LOI) measurement, UL-94 test, and dynamic mechanical analysis. The flame-retardant mechanisms of modified thermosets were investigated by thermogravimetric analysis, Py-GC/MS, Fourier transform infrared, SEM, elemental analysis, and laser Raman spectroscopy. The results revealed that epoxy thermoset modified with DAP displayed the blowing-out effect during UL-94 test. With the incorporation of 10 wt % DAP, the modified thermoset showed an LOI value of 36.1% and V-0 rating in UL-94 test. The flame-retardant mechanism was ascribed to the quenching and diluting effect in the gas phase and the formation of phosphorus-rich char layers in the condensed phase. However, the thermoset modified with 10 wt % AP only showed an LOI value of 25.7% and no rating in UL-94 test, which was possibly ascribed to the mismatching of charring process with gas emission process during combustion. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43953.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Xiangyang Wang,Xiu-Zhi Tang,Xiaoping Hu,Pengfei Wang
Since high-speed collisions often give rise to catastrophic damage, investigating the enhancement and dynamic behavior of composites is essential. Herein, graphene oxide (GO) and its surface-modified derivative were separately incorporated into the polyurethane matrix and their dynamic mechanical properties were examined and compared. A drop-weight dynamic tension device was used to characterize the mechanical properties of composites. The collected results show significant improvement in failure strength while incorporating GO as the nanofiller. And, the slightly reduced graphene oxide (SRGO) grafted with polyethyleneimine (SRGO-PEI) is beneficial in improving the plastic stress. The high-speed deformation process reveals severe strain localization before the break. The morphology of fracture surfaces indicates the SRGO-PEI plays a vital role in hindering crack propagation . Then the constitutive equation was derived to describe the stress-strain curves of modified polyurethane films. This work involves the synergistic effect between surface modification of nanofillers and the dynamic behavior of polymer-based composites, which could be regarded as a guideline for designing the composites under high-velocity impact environments.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2022
·
IF 4.931
Yamei Lin,Ruyu Yan,Yan Zhang,Xiaohua Yang,Haiyang Ding,Lina Xu,Shouhai Li,Mei Li
Biomass eugenol derived polyols with two or three functionalities were synthesized and used for the preparation of self-healing polyurethanes PU-2SH and PU-3SH, respectively. The structure of PU-2SH and PU-3SH were characterized by Fourier transition infrared spectroscopy (FTIR). Variable temperature FTIR and swelling test were carried out to analysis the self-healing behavior and determine the self-healing temperature of PU-2SH and PU-3SH. The thermal stability, dynamic mechanical properties, swelling performance and self-healing performance of the prepared PU-2SH and PU-3SH were studied in detail. Compared with PU-2SH, PU-3SH showed higher stability, T g and storage modulus, and weaker self-healing abilities.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Heqing Fu,Yin Wang,Weifeng Chen,Wei Zhou,Jing Xiao
A novel silanized CoFe 2 O 4 /fluorinated waterborne polyurethane (SC/FWPU) pressure sensitive adhesive was synthesized and characterized by atomic force microscopy (AFM), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA) and contact angle tester. The adhesive properties were measured in a test machine. Experimental results showed that the hydrophobicity, thermal stability, dynamic mechanical properties, as well as adhesive properties of SC/FWPU were improved with the incorporation of SC into FWPU. The dynamic hydrophobicity can be well described by the wetting kinetic model. The spreading-penetration parameter increased with an increase in SC content. The higher the spreading-penetration parameter is, the faster the contact angle reaches equilibrium, and the faster the SC/FWPU pressure sensitive adhesive penetrates and spreads.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 29
·50685
·
IF 3.125
Ngoc Minh Ho,Thuy Chinh Nguyen,Thi Thanh Van Tran,Tien Dung Nguyen,Hoang Thai
The epoxy/silica nanocomposites containing a wide range of isopropyltri[di(octyl) phosphate] titanate coupling agent (KR-12) modified nanosilica (m-nanosilica) loading (0–7 wt%) cured with tetrabutyl titanate hardener were prepared. Their morphology, thermal stability, thermal expansion, and mechanical properties including hardness, abrasion resistance were investigated. The wetting ability of epoxy-nanosilica systems on glass surface was assessed based on static contact angle. The obtained results showed that the contact angle of the nanocomposites containing m-nanosilica is slightly changed as compared to the contact angle of pure epoxy resin and lower than that of the nanocomposite containing unmodified nanosilica. The data of dynamic mechanical analysis of the nanocomposites using different nanosilica content indicated that the presence of m-nanosilica lowered the recovery energy of the nanocomposites to 41.62% as compared to neat epoxy. The limiting oxygen index (LOI) of the nanocomposites confirmed that the m-nanosilica increased the flame retardance of epoxy matrix. When using 7 wt% of m-nanosilca, the LOI value of the nanocomposite was 27.4 while this index of neat epoxy was 21.6. The scanning electron microscopic images of residual char combustion of the nanocompsites indicated a formation of nanosilica layer contributed to restrain combustion of the material.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Jie Chen,Yigang Wang,Jinrui Huang,Ke Li,Xiaoan Nie
A tung-oil-derived renewable plasticizer, tung-maleic triglycidyl esters (TMTE), was prepared and incorporated into poly(vinyl chloride) (PVC) for the first time. The chemical structure was studied by Fourier transform infrared (FTIR), 1H nuclear magnetic resonance (NMR), and 13C NMR. The plasticizing effects of TMTE replacement of dioctyl phthalate (DOP) in soft PVC films were researched. Thermal stability, thermal degradation performance, dynamic mechanical property, and mechanical properties of pure PVC and PVC films were investigated with thermogravimetric analysis (TGA), TGA-FTIR, TGA-mass spectrometry, dynamic mechanical analysis, and mechanical test. The results showed that PVC films plasticized with the TMTE exhibited increased thermal stability, plasticizing effect, compatibility, and flexibility. When 30 phr (parts per hundred parts of resin) DOP was substituted with TMTE in PVC blends, glass transition temperature (Tg) dropped from 41.46 to 40.18 °C, the initial decomposition temperature (Ti), 10% and 50% mass loss temperatures (T10 and T50), had maximum increases of 8.0, 20.0, and 27.5 °C, respectively. The interaction between TMTE and PVC molecule was also discussed. Furthermore, the extraction, exudation, and volatility resistance of plasticizers were carried out and analyzed by solubility parameters, the results of which revealed the migration stabilities of PVC films were promoted with the increasing amount of TMTE.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 23
·27871-27881
·
IF 2.478
Zhang Hongda,Zhou Hong,Liu Guolong,Ge Jing,Jin Liguo
The hybrid fillers (Al 2 O 3 –ATP hybrids) composed of two types of inorganic materials—modified alumina (Al 2 O 3 ) and modified attapulgite (ATP)—were principally prepared, following which the epoxy matrix (EP) composites reinforced with Al 2 O 3 –ATP hybrids were synthesized. The mechanical and dynamic mechanical properties of fabricated Al 2 O 3 –ATP/EP composites are enhanced by doping Al 2 O 3 –ATP hybrids into EP. The highest impact and flexural strength of EP composites (3 wt% Al 2 O 3 –3 wt% ATP/EP) are improved to 27.88 kJ/m 2 and 157.04 MPa, which are 457.6% and 89.2% higher than those of the pure epoxy resin, respectively. The glass transition temperature of Al 2 O 3 –ATP/EP composites increases by 8.8 °C, compared with pure EP composites and the dielectric constant and dielectric loss can reach 3.19 and 0.0041 at 100 Hz. These excellent mechanical and dynamic mechanical properties, accompanied by dielectric property may expand the practical applications of EP composites in industrial engineering.
研究领域:
材料科学
·
工程学
✓ 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）