POLYMER
·
2024
·
IF 4.1
Yu Gu,Jiahao Liu,Wei Gao,Meichen Liu,Chunwang Yi
The preparation of polyesteramides (PEAs) with regular block structure has long been a challenge, owing to the occurrence of the ester-amide exchange during the polymerization at high tempereture. In this work, we report a simple and green method to prepare polyamide 6 (PA6) based triblock PEA whose structure is poly(ε-caprolactone)-block-PA6-block-poly(ε-caprolactone) (PCL- b -PA6- b -PCL) using tetraphenyl tin as catalyst without solvent. The first segment PA6 was synthesized via cationic ring-opening polymerization (ROP) of ε-caprolactam (CPL), later, ROP of ε-caprolactone (CL) was involved to extend polycaprolactone (PCL) segments by using tetraphenyl tin as catalyst. By varying the proportion of CPL and CL, series PA6-based PEAs was prepared and characterized by gel permeation chromatography, 1 H, DOSY, and 13 C NMR. The results showed that PEA containing more proportion of CL presented a higher molecular weight with narrow polydisperse index. In particular, the lower water absorption and lower oligomers content infers that the PEA could have a prospective application in processing precision electronic devices.
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 ENGINEERING
·
2023
·Vol. 43
·期 4
·333-342
·
IF 2
Tian Yang,Shengpeng Zhan,Dan Jia,Jiesong Tu,Lixin Ma,Haitao Duan
The blended composites with ultra-high molecular weight polyethylene (UHMWPE) as the matrix polymer, sodium polyacrylate (PAANa), and tetraphenyltin (Ph 4 Sn) as fillers were prepared by hot compression molding process. The friction and wear behavior of GCr15 balls with composites mating pairs under the seawater environment was explored, and the friction and wear mechanism was analyzed. The results show that adding PAANa, a polyelectrolyte material, can effectively reduce the friction coefficient of UHMWPE/PAANa/Ph 4 Sn composites. The wear resistance of composites increased significantly with increasing Ph 4 Sn content compared with pure UHMWPE, and the best wear resistance was observed at 1% content. The primary wear mechanism of UHMWPE/PAANa/Ph 4 Sn composites changed from adhesive wear of pure UHMWPE to plastic deformation at lower PAANa and Ph 4 Sn contents and finally to adhesive wear and spalling. This work provides a theoretical basis for preparing and applying other polymer blend composites.
研究领域:
材料科学
·
摩擦学
·
海洋工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER ENGINEERING
·
2021
·Vol. 41
·期 9
·759-767
·
IF 1.367
Tian Yang,Haiping Xu,Yongliang Jin,Ke Huang,Jiesong Tu,Dan Jia,Shengpeng Zhan,Lixin Ma,Haitao Duan
A range of ultra-high molecular weight polyethylene (UHMWPE)/tetraphenyltin (Ph 4 Sn) nanocomposites were fabricated by hot-pressing. The surface hardness and crystallinity of composites were studied. It revealed that the surface hardness of the composites decreased slightly, and the changing trend of crystallinity was consistent with the hardness. The tribological properties of composites under seawater lubricating conditions were investigated. The experimental results showed that the friction coefficients of the composites almost keep the same but the wear reduced sharply. With the increases of Ph 4 Sn content, the wear of composites first decreases significantly and then increases, meanwhile the friction coefficient remains basically unchanged. The dominant wear mechanism has changed from adhesive wear to plastic deformation and finally to abrasive wear. The addition of Ph 4 Sn particles reduces the sensitivity of the Ph 4 Sn/UHMWPE composites to water and transfers the load to the UHMWPE network, resulting in the wear resistance improved.
研究领域:
材料科学
·
摩擦学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Jiao Wang,Zhiyuan Mi,Caihong Lu,Zhenhua Han,Yuxin Wu,Xiaolong Fu,Guofang Zhang
The practical utility of bismuth and tin compounds, as promising green combustion catalysts, is constrained by their substantial particle agglomeration. Herein, a straightforward ultrasonication-assisted method was reported to incorporate bismuth and tin compounds into the inner spaces of carbon nanotubes (CNTs), affording CNTs-confined bismuth (tin) compounds. The as-prepared nanocomposites were structurally completely characterized. The electrochemical property investigations showed that the introduction of bismuth and tin compounds increases the catalytic active sites of carbon nanotubes and inhibits nanoparticle agglomeration effectively. The theoretical calculations revealed that synergistic effects between Bi 2 O 3 and carbon nanotubes can improve the efficiency of electron transfer in the Bi(NO 3 ) 3 @A-CNTs(M1) composite. The evaluation results of the combustion catalytic performance of the nanocomposites on ammonium perchlorate (AP) pyrolysis suggested that adding 5 wt.% Bi(NO 3 ) 3 @A-CNTs(M1) and DBT@A-CNTs(M1) (DBT = Dibutyltin dichloride) in AP brought about a more concentrated thermal decomposition process, advancing the peak of AP in the high-temperature decomposition stage from 420.4 ℃ to 328.9 and 325.9 ℃, respectively, and boosting its heat release from 976.42 J·g −1 to 2251.2 J·g −1 and 2452.03 J·g −1 , respectively. The studies on the thermal degradation mechanism of AP, probed by thermal decomposition kinetics, in-situ solid FTIR and TG-FTIR-MS, concluded that the electron transfer from the critical steps ClO 4 − to NH 4 + and O 2 to O 2 − is accelerated by the interaction of the in-situ formed Bi 2 O 3 nanoparticles and carbon nanotubes, boosting the relative contents of more stable gases, and ultimately promoting AP pyrolysis. A tentative catalytic thermal degradation mechanism of AP is finally proposed.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 46
·17026-17032
·
IF 4.174
Miao Wang,Guo-Ming Weng,Ghulam Yasin,Mohan Kumar,Wei Zhao
Tin phosphide (SnxPy) is considered as an alternative anode material for lithium-ion batteries (LIBs) due to its high theoretical lithium-storage ability. Herein, carbon-coated SnP/C and Sn4P3/C composites are obtained via a facile solid-phase method for the first time. Subsequently, the lithium storage performances of SnP/C and Sn4P3/C are investigated in coin-cells, demonstrating a significantly high lithiation capacity and outstanding stability due to the introduction of carbon. Typically, the SnP/C anode delivers a very high specific capacity up to 751 mA h g−1 at 0.1 A g−1 and a specific capacity of 610 mA h g−1 with a long cycling life of 500 cycles at a current density of 1.0 A g−1, while the Sn4P3/C anode yields 727 mA h g−1 at 0.2 A g−1 after 100 cycles. The specific capacities achieved here are remarkably higher than those of any other tin phosphide materials reported in previous studies. Moreover, the stability and cycling performance of these materials are significantly better in comparison with the previous studies, manifesting the best lithium-storage capacity performance of the SnxPy anode to date.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Sachin Mane,Yu-Xia Li,Xiao-Qin Liu,Lin-Bing Sun
The use of porous carbons for selective CO2 separation attracts increasing attention. Owing to low thermostability of porous polymers, low yield is the major concern of porous carbons. To obtain porous carbons with high yield, the development of thermostable porous polymers is highly expected. Herein, high yielded (70% for 700 °C and 64% for 800 °C) Sn-doped porous carbons (SnPCs) have been constructed through KOH-assisted carbonization of Sn-containing polymer. Notably, SnPC-700 (218.5 mg·g–1) demonstrates higher CO2 adsorption capacity than the reference sample prepared without KOH, SnPC-700r (188.3 mg·g–1), indicating the importance of KOH-assisted activation. Carbonization temperature has an effect on the adsorption capacity of resultant materials, and high carbonization temperature leads to better adsorption capacity on CO2. SnPC-800 is able to capture 242.8 mg·g–1 of CO2, which is better than some benchmarks including BILP-7 (193.0 mg·g–1), PAF-1–450 (196.4 mg·g–1), and FCTF-1 (205.5 mg·g–1). More importantly, SnPC-800 demonstrates good selectivity of CO2 over CH4 (31.1). Thus, high yield and good performance upon CO2 adsorption capacity and selectivity over CH4 make SnPCs attractive candidates for the removal of CO2 from natural gas.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2016
·Vol. 7
·期 33
·5312-5321
·
IF 5.687
Xiao Wang,Yuan Gao,Wenjie Wang,Anjun Qin,Jing Zhi Sun,Ben Zhong Tang
A series of poly(diphenyl substituted acetylenes) (PDSAs) were prepared through a post-polymerization modification strategy. Primary amine, tertiary amine and quaternized ammonium functionalities were successfully and efficiently attached onto the skeleton of poly(1,2-diphenylacetylene) via the precursor PDSA (P0) with activated ester moieties. The structures of the derived amine-functionalized PDSAs, the modification processes and the efficiency of the post-polymerization modification were characterized by multiple spectroscopic techniques. With the aid of the protection and de-protection of tert-butyloxyl carbonyl (P1), PDSA bearing terminal primary amine groups (P2) were obtained. The plentiful amine groups on the side-chains helped in grafting P2 onto graphene oxide (GO) and the resultant hybrids not only showed a greatly improved dispersing ability in organic solvents, but also emitted strong yellow-greenish fluorescence. The polymer bearing tertiary amine functionalities on side chains (P3) could be directly derived from reacting P0 with 3-N,N′-dimethyl-1-propylamine under mild conditions and in high yield. P3 showed evident pH-dependent fluorescence emission behaviour. Based on P3, cationic PDSA P4 was readily obtained by the transition of tertiary amine to quaternized ammonium functionalities. This transition afforded a novel fluorescent and polyelectrolytic PDSA. P4 was tried as a water soluble fluorescent probe in calf thymus DNA (ct-DNA) detection. The experimental data indicated that P4 at a low concentration of 0.1 ppm can respond to the existence of 10−11 g L−1ct-DNA in aqueous solution. The working mechanism was associated with the aggregation-induced emission enhancement. The present work, together with our previous reports, suggests that the PDSA with an activated ester precursor can be employed as a broad platform to construct different functional PDSAs.
研究领域:
高分子化学
·
材料科学
·
生物医学
✓ 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）