POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 9
·2313-2320
·
IF 2.162
Hui Zhao,Si-Qi Zhao,Guo-Hua Hu,Qun-Chao Zhang,Yang Liu,Chong-Xing Huang,Wei Li,Tao Jiang,Shuang-Fei Wang
A facile method was developed to synthesize a new type of polyhedral oligomeric silsesquioxane (POSS). It contained a single amine group and seven aliphatic moieties on its corners. FT-IR, 1 H-NMR, 13 C-NMR, 13 C- 1 H COSY, and 1 H- 1 H COSY confirmed that cages with eight corners were the main part of the product. This new POSS was used to modify the structure of hexamethylene diisocyanate trimer and then copolymerized with hexamethylene diisocyanate and poly (tetramethylene glycol) to get a serious of waterborne polyurethane (WPU)/POSS hybrid materials with low dielectric constants for microelectronics applications. The results showed that POSS particles were uniformly dispersed in the WPU dispersions. The WPU/POSS films did not show any macrophase separation, even when the POSS content was as high as 16%. As the POSS content increased from 0% to 16%, the tensile strength was increased from 2.3 to 7.3 MPa, the dielectric constant was decreased from about 2.9 to 2.0, and the thermal stability of the WPU/POSS was also improved.
研究领域:
高分子科学
·
材料化学
·
纳米复合材料
·
电子封装材料
·
功能高分子
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 26
·期 8
·953-959
·
IF 1.757
Shuting Wang,Lan Cen,Qihao Wu
Maleated glycidyl 3-pentadecenyl phenyl ether with styrene (MGS) was synthesized from glycidyl 3-pentadecenyl phenyl ether (GPPE), maleic anhydride (MAH) and styrene (St) in the presence of AIBN initiator at 80°C, and then the resultant MGS was applied as a compatibilizer to prepare SBR/silica composites. Meanwhile, the commercial compatibilizer bis-(triethoxysilylpropyl) tetrasulfide (named Si69) added into composite was also prepared for comparison purpose. The synthetic MGS structure was characterized by GPC and FTIR, and SBR/silica compounds with different compatibilizer were analyzed using RPA, DMA and so on. The results showed that M̄n and M̄w of MGS were 19,538 g/mol and 23,790 g/mol, respectively. The curing time of compounds with MGS increased, whereas the maximum and minimum torques decreased. The addition of MGS decreased Payne effect of SBR/silica compounds, which implied an improvement of silica dispersion in the compounds. Bound rubber content of compound with MGS was about 1.7 times higher than the absence and 1.5 times higher than that with Si69. The tensile strength of the composites was improved by increasing compatibilizer loading, and the optimum value was observed at 6 phr of MGS. Meanwhile the use of MGS can improve the anti-aging property of composite. According to DMA, the tanδ value at 0°C of composite with MGS was higher than composite without compatibilizer suggesting that MGS can improve the wet skid resistance of composite. The SEM analysis revealed that introduction of MGS enhanced the compatibility between SBR and silica. Copyright © 2015 John Wiley & Sons, Ltd.
研究领域:
高分子化学
·
橡胶复合材料
·
材料界面科学
·
功能高分子
·
聚合物改性
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 5
·e6421
·
IF 3.1
Ya-Jing Cao,Xue-Jie Gai,Wei Li,Hai-Hui Liu,Na Han,Xing-Xiang Zhang
Artificial muscles have attracted great attention as actuators and coiled and twisted monofilament actuators are considered the most promising ones. In the present work, the torsional properties of poly(hexamethylene adipamide) (PA66), poly(ethylene terephthalate) (PET), and high-strength PET (HTPET) monofilaments were investigated. Furthermore, cross-linked PET (CPET) monofilaments were melt-spun by adding 1 wt% of 2-dimethoxy-2-phenylacetophenone (ultraviolet (UV) initiator) and triallyl iso-cyanurate (cross-linking agent) in PET chips under UV radiation. The HTPET monofilaments had the highest torsional modulus of 1.1 GPa followed by the PET (0.8 GPa) and PA66 (0.6 GPa) monofilaments. Subsequently, the HTPET monofilaments were subjected to heat treatments under tension. When the heat treatment time was 10 min, the mechanical properties of the HTPET monofilaments also tended to first increase and then decrease with the rise of heat treatment temperature. The molecular arrangement and crystal structure of the HTPET monofilaments were gradually improved with the prolongation of tension heat treatment. The tensile strength and initial modulus of the HTPET monofilaments were 871.4 MPa and 15.8 GPa, respectively. The mechanical properties of the CPET monofilaments first increased and then decreased with the increase of the drawing ratio. When the drawing ratio was 10, the CPET monofilament had a tensile strength of 717.2 MPa, an initial modulus of 16.7 GPa, and a maximum torsional modulus of 1.3 GPa. Therefore, both heat treatment and cross-linking increased the mechanical strength of the PET monofilaments. CPET and HTPET are possible to be used as artificial muscles.
研究领域:
材料科学
·
高分子物理
·
纺织工程
·
生物医学工程
·
智能材料
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 5
·1314-1324
·
IF 2.162
Tongtong Ma,Liping Li,Tao Liu,Chuigen Guo
A novel curing and flame-retardant agent (PEPA-TMAC) was successfully synthesized. The chemical structure was characterized by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). Use of PEPA-TMAC as part of the curing agent in combination with another anhydride for a commercial epoxy resin (EP) was studied. Results of differential scanning calorimetry (DSC) indicated that PEPA-TMAC was an effective curing agent for EP. The dynamic mechanical analysis (DMA) results showed that the glass transition temperature ( T g ) and cross-linking density ( V e ) of EP composites exhibited an increase trend with the addition of PEPA-TMAC. The limiting oxygen index (LOI) value of EP composites reached 26.9%, and the cone calorimeter results indicated that peak heat release rate (PHRR), total heat release (THR), smoke produce rate (SPR), and total smoke produce (TSP) remarkably decreased with increasing PEPA-TMAC content. TGA data showed that the addition of PEPA-TMAC greatly increased the amount of residual char during combustion. The morphology of the residual char was studied by SEM and showed that the addition of PEPA-TMAC greatly increased the stability of EP composites. The thermogravimetric analysis (TGA), energy-dispersive X-ray spectroscopy (EDS), and FTIR results revealed the flame-retardant mechanism that PEPA-TMAC can promote the formation of charred layers with the phospho-carbonaceous complexes in the condensed phase during burning of EP composites.
研究领域:
高分子化学
·
材料科学
·
阻燃材料
·
热分析
·
复合材料
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2014
·Vol. 26
·期 1
·68-76
·
IF 1.964
J. Lin,C. Zheng,M. N. Zhu,Y. Z. Chen,P. P. Lu,Q. Liu,X. F. Cai,J. W. Zhuang,X. M. Cai,L. P. Liao,G. Y. Yuan,C. L. Xu
This paper described the synthesis of copolymer emulsions of fluorine and siloxane-containing acrylates for water-repellent cotton fabrics coatings. Chemical composition, morphology structure, and properties of the latex copolymers were investigated by Fourier transform infrared (FTIR), dynamic light scattering (DLS), gel permeation chromatography (GPC), and transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). Effects of water-repellent functional monomers (R f ) on surface morphology, water contact angle, and water-repellent properties of the coated fabric surface were also studied. The results indicated that R f greatly influenced molecular mass distribution of the latex copolymers, the molecular aggregation states and orientation of R f on the coated fabric surface, and water-repellency of coated cotton fabrics. Copyright © 2014 John Wiley & Sons, Ltd.
研究领域:
高分子科学
·
纺织品涂层
·
表面化学
·
材料科学
·
功能整理
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2010
·Vol. 23
·期 1
·114-121
·
IF 1.532
Huan Liu,Kai Xu,Hualun Cai,Jiangxun Su,Xin Liu,Zien Fu,Mingcai Chen
Through addition reaction of Schiff-base terephthalylidene-bis-( p -aminophenol) ( DP-1 ) and diethyl phosphite (DEP), a novel phosphorus-modified epoxy, 4,4'-diglycidyl-(terephthalylidene-bis-( p -aminophenol))diphosphonate ether ( EP-2 ), was obtained. An modification reaction between EP-2 and DP-1 resulted in an epoxy compound, EP-3 , possessing both phosphonate groups and CN imine groups. The structure of EP-2 was characterized by Fourier transform infrared (FTIR), elemental analysis (EA), 1 H, 13 C, and 31 P NMR analyses. The thermal properties of phosphorus-modified epoxies cured with 4,4'-diaminodiphenylmethane (MDA) and 4,4'-diaminodiphenyl ether (DDE) were studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The activation energies of dynamic thermal degradation ( E d ) were calculated using Kissinger and Ozawa's methods. The thermal degradation mechanism was characterized using thermogravimetric analysis/infrared spectrometry (TG-IR). In addition, the flame retardancy of phosphorus-modified epoxy thermosets was evaluated using limiting oxygen index (LOI) and UL-94 vertical test methods. Via an ingenious design, phosphonate groups were successfully introduced into the backbone of the epoxies; the flame retardancy of phosphorus-modified epoxy thermosets was distinctly improved. Due to incorporation of CN imine group, the phosphorus-modified epoxy thermosets exhibited high thermal stabilities; the values of glass-transition temperatures ( T g s) were about 201–210°C, the values of E d were about 220–490 kJ/mol and char yields at 700°C were 49–53% in nitrogen and 45–50% in air. These results showed an improvement in the thermal properties of phosphorus-modified epoxy by the incorporation of CN imine groups. Copyright © 2010 John Wiley & Sons, Ltd.
研究领域:
高分子科学
·
材料化学
·
阻燃材料
·
热分析
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 7
·1663-1672
·
IF 2.162
Jinhui Liu,Di Li,Zhe Fu,Jieting Geng,Jing Hua
The development of silica-filling elastomers with high mechanical performance and good processability is still a great challenge. In this study, we fabricated siloxane-grafted atactic 1,2-polybutadiene (1,2-PB) rubber through grafting poly(1,3-butadiene)-block-(dimethylsiloxane) (PB-b-PDMS) onto 1,2-PB molecular chains by coordination polymerization using a molybdenum (Mo)-based catalyst system. The PB-b-PDMS with active double bonds was synthesized by anionic polymerization. Fourier transform infrared analysis (FTIR), elementary analysis, and GPC-MALLS-viscometer analyses verified the incorporation of PB-b-PDMS and the grafting structure in the resulting polymer. Scanning electron microscope (SEM), bound rubber testing, and dynamic mechanical analysis demonstrated that the graft-modification with PB-b-PDMS improved silica dispersity in the 1,2-PB matrix because the incorporation of siloxane groups provided stronger interfacial interaction with silica. Meanwhile, the graft-modified 1,2-PB exhibited lower Mooney viscosity, higher tensile strength, and lower heat build-up than unmodified 1,2-PB. This concept provides novel inspiration for the preparation of advanced rubber with promoted silica compatibility and mechanical performance.
研究领域:
高分子科学
·
材料工程
·
橡胶技术
·
纳米复合材料
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 12
·e70011
·
IF 3.1
Jinsheng Duan,Chuxuan Deng,Zhaogang Liu,Yilin Li,Peijie Jia,Yanhong Hu,Xiaowei Zhang,Jinxiu Wu,Jianfei Li
This study systematically examines the effects of diphenylphosphinic acid (DPPA) and sarcosine (SAR) intercalation into magnesium aluminum lanthanum hydrotalcite (LDHs) on its structure and thermal stability. Using charge distribution, structural optimization, energy calculations, XRD, FTIR, TEM, and thermal stability tests, the study reveals that DPPA anions, with higher negative charge density, increase the interlayer spacing to 6.08 Å and exhibit a binding energy of −0.7624 eV. SAR anions, with a thinner interlayer spacing of 4.11 Å and a binding energy of −1.603 eV, create a more stable structure. SAR's higher dipole moment (2.827 a.u.) compared to DPPA (2.077 a.u.) enhances electrostatic interactions. Thermal stability tests show SAR-LDHs and DPPA-LDHs extend PVC's stability to 53.67 and 56.67 min, respectively. DPPA anions provide superior stability at high temperatures, while SAR anions excel in moderate temperatures. This study offers insights for designing thermally stable composite materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 6
·1870-1874
·
IF 2.137
Haibo Chang,Dongdong Li,Tingting Cao,Qingshuo Li,Zhanwei Bu,Wenshan Zhao,Tong Lin
In this study, we have for the first time demonstrated that palladium chloride (PdCl 2 ) is an efficient catalyst for ring-opening polymerization of cyclohexene oxide in a solvent-free condition. The polymerization product was in atactic structure, and reaction conditions, such as reaction temperature, time, and catalyst amount, showed effects on polymerization conversion yield, turnover number, and number-average molecular weight of the resulting poly(cyclohexene oxide). PdCl 2 catalysis follows a cationic ring-opening mechanism. The polymerization result is highly determined by the chemical structure of the monomers.
研究领域:
化学
·
高分子科学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 9
·3515-3522
·
IF 3.665
Yifan Xiao,Jiaxuan Li,Jun Wu,Liang Song,Yuxi Han,Zhongwei Wang,Qing Yu
Glass fiber reinforced polyethylene terephthalate (PET/GF) with enhanced flame retardancy was prepared with few-layer black phosphorus (BPs) for the first time. The performance of red phosphorus (RP) modified PET/GF was also investigated for comparison. Results show that PET/GF with 0.9 wt% BPs (PET/GF@BP-0.9) can eliminate the ignition of cotton by dripping. The addition of 2.7 wt% of BPs can make the PET/GF sample pass UL 94 V-0 classification, while a much higher of 6.3 wt% RP was needed to pass the same classification. Compared with neat PET/GF, the peak heat release rate (PHRR) and total heat release (THR) rate of PET/GF@BP-2.7 decreases ca. 52.5% and 34.8%, respectively. The studies of char residues reveal that BPs could act as a catalyst for char formation and the formed char could roughen the surface of GF and thus restrain the “wick effect.” Thermogravimetric analysis/infrared spectrometry shows that the addition of BPs significantly inhibited the release of gas-phase products. The attractive abilities of BPs as flame retardant provide a novel and effective way of PET/GF modification.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 9
·3495-3504
·
IF 3.665
Kun Cong,Jiyu He,Rongjie Yang
TPU and flame-retardant TPU (FR-TPU) were prepared through a polyaddition reaction with polytetramethylene ether glycol (PTMEG) and 4,4′-methylene-bisphenyl-isocyanate (MDI) by reactive extruding. 1,4-Butanediol (BDO) and diethyl bis(2-hydroxyethyl) amino methyl phosphonate (DBAMP) were used as the chain extender in different ratios, respectively, to obtain TPU and flame-retardant TPU (FR-TPU)with adjusted molecular weight and mechanical properties. The resulting TPU and FR-TPU were characterized by FTIR, DSC, TGA, and NMR. A kinetic model based on the data from extrusion process was used to depict the polymerization of TPU. These reactions carried out without any solvent and the residual water showed that the polymerization with BDO could be achieved in 20 minutes, instead, that with DBAMP in 55 minutes while with a similar molecular weight. These results point out that Twin Screw Extrusion Reaction (TSER) is a suitable and convenient way to produce a variety of polymers.
研究领域:
材料科学
·
高分子化学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 9
·3679-3688
·
IF 3.665
Imdad Ali,Ahsan Ali,Ahmed Ali,Muhammad Ramzan,Khalid Hussain,Li Xudong,Zhan Jin,Otavio Augusto Titton Dias,Yang Weimin,Li Haoyi,Zhang Liyan,Mohini Sain
Electroresponsive devices have attended significant interest for actuators and artificial muscles in recent days but are susceptible to low deformation at applied voltages. To address this problem, herein, we have prepared novel flexible composite gel based on polyvinyl chloride (PVC), dibutyl adipate (DBA), and functionalized reduced graphene oxide (f-rGO) via solution casting technique. The structural, morphological, optical, mechanical, and thermal properties of the composite PVC/f-rGO gel were characterized by using various techniques. In order to test the usefulness of PVC/f-rGO, we fabricated the new planar PVC/f-rGO-based gel actuator, by holding the gel between two electrodes. Stimuli-responsive deformation of ~2.7 mm was measured at a voltage of 1200 V for an optimized gel in the designed device. The loading of silane-f-rGO greatly enhanced the stimulation, response time and flexibility of the PVC gel. The highest elongation at break of about 433% was achieved for f-rGO-loaded PVC gel owing to strong dipole–diploe interactions between alpha hydrogen of PVC and -NH 2 of f-rGO. We believe that highly electro-stimulated, soft and, flexible PVC/f-rGO gels could open a new avenue for the fabrication of advanced artificial muscles and tunable soft actuators for number of applications.
研究领域:
材料科学
·
纳米技术
·
机械工程
·
电活性聚合物
·
智能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）