NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 38
·16836-16843
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IF 2.7
Qingyun Ge,Baihu Dong,Yunqi Chen,Xinqiang Wang,Xiang Wang,Chaogang Fan,Chuhua Chen,Shaohui Lin,Qinmin Pan,Flora T. T. Ng
The polymerization and degradation behaviors of polypropylene carbonate (PPC) of different molecular weights were explored in the presence of catalyst Salen–Co(III)–Cl. The degradation of low-molecular-weight PPC (Mn = 2500 g mol−1, Đ = 1.01) was studied in detail, which was a second-order reaction related to the molar concentrations of PPC and the catalyst. Catalyzed by salen–cobalt, the degradation reaction proceeded spontaneously and could be completed at room temperature and atmospheric pressure, which provided a green and economical method for chemical degradation recycling of CO2-based polycarbonate plastics. On the basis of the degradation investigation, a method for the synthesis of cyclic propylene carbonate from propylene oxide and CO2 at room temperature and atmospheric pressure was developed.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 5
·552
·
IF 2.935
Xianggen Chen,Lingyun Wang,Jiuying Feng,Xianling Huang,Xiuzhi Guo,Jing Chen,Zhenyuan Xiao,Xiangjun Liang,Lijun Gao
Thermally and mechanically enhanced poly(propylene carbonate) (PPC) with networks was prepared by adding a cyclic carboxylic dianhydride, bicyclo(2,2,2)oct-7-ene-2,3,5,6-tetracarboxylic dianhydride (BTCDA), in the CO2/propylene oxide (PO) copolymerization. The obtained copolymers were characterized by FT-IR,1H NMR, DSC, and TGA. The gel, melt flow rate, hot-set elongation, and tensile properties were also measured. The formation of networks was confirmed by the presence of gel and the shape recovery after the hot-set elongation test. The minimum permanent deformation of the copolymer is 3.8% and that of PPC is 4539% higher than this value. The results show that BTCDA units are inserted into the backbone of PPC, and the PPC chains are connected successfully owing to cyclic multifunctional anhydride groups in BTCDA. With increasing feed molar ratio of BTCDA to PO from 1 to 4%, the yield strength of copolymers increases from 18.1 to 37.4 MPa compared to 12.9 MPa of PPC. The 5% weight-loss degradation temperatures and maximum weight-loss degradation temperatures greatly increase up to 276.4 and 294.7 °C, respectively, which are 58.6 °C and 55.1 °C higher than those of PPC. These enhanced properties originate from the formation of crosslinks by the rigid and bulky multifunctional dianhydride.Keywords:poly(propylene carbonate);networks;dianhydride;terpolymerization;modification
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2019
·
IF 2.29
Zhijun Zhao,Ying Huang,Zhaohuan Zhang,Weiyang Fei,Mingsheng Luo,Yongsheng Zhao
Currently, solvent-based absorption is known as an effective technology to capture acid gases, e.g., CO 2 or H 2 S. In this work, the constant-volume method is used to determine CO 2 and H 2 S solubility in propylene carbonate (PC), imidazolium-based ionic liquids (ILs): 1-butyl-3-methylimidazolium tetrafluoroborate [Bmim][BF 4 ], 1-hexyl-3-methylimidazolium tetrafluoroborate [Hmim][BF 4 ], and 1-octyl-3-methylimidazolium tetrafluoroborate [Omim][BF 4 ], and their mixtures at temperature from 303.15 to 333.15 K under pressures up to about 1 MPa. Besides, the quantum chemistry-based COSMO-RS models are used to predict the vapor pressure and the solubility in these solvents. The experimental results illustrate that adding [Omim][BF 4 ] into PC can improve the CO 2 and H 2 S solubility and the H 2 S/CO 2 selectivity compared with the pure PC, which increases with the increasing [Omim][BF 4 ] mass fraction in the mixtures. The simulation with COSMO-RS shows the vapor pressures of PC in the mixtures decreases with the increasing [Omim][BF 4 ] mass fraction. Moreover, the prediction results show that COSMO-RS-Lei model is in much better agreement than COSMO-RS (ADF 2005) for predicting both CO 2 and H 2 S solubility and the prediction accuracy of CO 2 is better than that of H 2 S. Finally, the mixtures of PC and [Omim][BF 4 ] may be used as promising physical solvents to capture CO 2 and H 2 S selectively with high partial pressures because they connect the advantages of organic solvents and ILs.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Yuhao Zhang,Hui Wang,Dexin Sun,Liang Zhao,Jinsen Gao,Chunming Xu
The separation of olefin from aromatics and sulfides by using propylene carbonate (PC) solvent was studied by the ternary liquid–liquid equilibrium (LLE) of PC + aromatics/sulfide +olefin. The effects of aromatic, sulfide, and olefin structures were investigated by a combination of experiments and quantum chemical calculations. The aromatics and sulfides without side chains were easier to dissolve in PC. Efficient olefin separation was observed because the side chain did not change the positive charge enrichment region of the molecule, and instead increased the steric space when combined with solvent molecules. The olefin separation factor S in the separation of 1-hexene and thiophene is 12.96, which is 1.64 times higher than that in the separation of 1-hexene and 3-methylthiophene. In addition, the binary parameters between the PC and fluid catalytic cracking (FCC) naphtha components for NRTL and UNIQUAC thermodynamic models were obtained using the ternary LLE data to make up for the blank in Aspen simulation for the separation of FCC naphtha by PC solvent. Then, the correlation of NRTL and UNIQUAC models was compared, which the root-mean square deviation (RMSD) of these two models is lower than 0.0043. The NRTL model shows a better correlation with experimental data.
研究领域:
化学工程
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石油炼制工程
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量子化学
✓ 已验证
DOI
高影响因子
Green Energy & Environment
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2025
·
IF 14.6
Jie Liang,Jingcong Xie,Jianchun Jiang,Yan Ma,Jun Ye,Xianhai Zeng,Kui Wang
A novel environmentally benign biphasic system composed of propylene carbonate (PC) and aqueous solution of p -toluenesulfonic acid ( p -TsOH aq) was designed for the efficient valorization of lignocellulosic bamboo residues, resulting in more than 95.5% of hemicellulose and 97.2% of lignin digested under mild conditions of 130 °C for 1 h. Meanwhile, 91.9% of cellulose was retained with loose structure, followed by 95.8% enzyme hydrolysis yield and 347.9 mg/g of glucose yield. Notably, the synergistic effect between PC and p -TsOH on efficiency and selectivity was proposed by a control group experiment and subsequently verified, which is believed to be responsible for the simultaneous degradation and separation of lignin and hemicelluloses into oligomeric phenols and pentose, also facilitating subsequent valorization. Furthermore, the novel PC/ p -TsOH aq biphasic system demonstrated excellent retrievability and adaptability to different feedstocks, offering a promising green strategy for the efficient valorization of lignocellulosic biomass in industrial biorefineries.
研究领域:
生物质能
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绿色化学
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环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2024
·Vol. 25
·期 9
·4730
·
IF 4.9
Kang Chen,Xinyu Zhang,Zanru Wang,Ce Sun,Haiyan Tan,Yanhua Zhang
To enrich the properties of polylactic acid (PLA)-based composite films and improve the base degradability, in this study, a certain amount of poly(propylene carbonate) (PPC) was added to PLA-based composite films, and PLA/PPC-based composite films were prepared by melt blending and hot-press molding. The effects of the introduction of PPC on the composite films were analyzed through in-depth studies on mechanical properties, water vapor and oxygen transmission rates, thermal analysis, compost degradability, and bacterial inhibition properties of the composite films. When the introduction ratio coefficient of PPC was 30%, the tensile strength of the composite film increased by 19.68%, the water vapor transmission coefficient decreased by 14.43%, and the oxygen transmission coefficient decreased by 18.31% compared to that of the composite film without PPC, the cold crystallization temperature of the composite film increased gradually from 96.9 °C to 104.8 °C, and PPC improved the crystallization ability of composite film. The degradation rate of the composite film with PPC increased significantly compared to the previous one, and the degradation rate increased with the increase in the PPC content. The degradation rate was 49.85% and 46.22% faster on average than that of the composite film without PPC when the degradation was carried out over 40 and 80 days; the composite film had certain inhibition, and the maximum diameter of the inhibition circle was 2.42 cm. This study provides a strategy for the development of PLA-based biodegradable laminates, which can promote the application of PLA-based laminates in food packaging.
研究领域:
材料科学
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环境科学
·
食品包装
✓ 已验证
DOI
PubMed
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Yulong Wu,Yingfang Nie,Li Sun,ZhenHao Xi,Zhen Liu
Zinc glutarate (ZnGA) is a prominent catalyst for the production of CO 2 -based poly(propylene carbonate). The original catalysts, ZnO-GA ( Cat 1 ) and ZnAc 2 -GA ( Cat 3 ), were prepared using ZnO and ZnAc 2 as Zn sources, respectively. ZnO-GA-H 2 O ( Cat 2 ) and ZnAc 2 -GA-H 2 O ( Cat 4 ) were prepared by water treatment of Cat 1 and Cat 3 , respectively. After water treatment, both Cat 2 and Cat 4 showed enhanced performance for copolymerization of CO 2 and propylene oxide. The characterizations demonstrated that H 2 O is a critical component that not only improves the crystallinity and external surface area of ZnGA, but also increases the number of surface Zn-OH groups. By adding a portion of cyanide, further modification on Cat 4 resulted in a group of ZnAc 2 -GA-H 2 O/DMC catalysts ( m-Cat 4 ). The polymerization reached a high yield of 1729 g poly/g Cat and a selectivity of 98.7 % at molar ratio of DMC/ZnGA = 1: 10 ( t = 24 h; T = 70 °C; P = 4 MPa). The modified ZnGA/DMC catalyst exhibited remarkable yield and selectivity for the copolymerization of CO 2 and propylene oxide to produce high molecular weight alternating copolymers (2.3 × 10 5 g/mol).
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Xuhui Zhang,Xing Li,Guangyao Ji,Jing Huang,Ting Li,Bihua Xia,Shibo Wang,Weifu Dong
Compatibilizing polymer blends via a facile and efficient manner is of great significance since polymer blends are practical in industrial applications but limit severely by poor compatibility. Herein, we propose a novel compatibilization strategy that star-shaped multi-arm polymer with low molecular weight can be an excellent compatibilizer for polymer blends. As an example of the concept, a modified tannic acid (mTA) with a star-shaped multi-arm structure is fabricated to compatibilize biodegradable poly(lactic acid)/poly(propylene carbonate) (PLA/PPC) blend. Compared to traditional compatibilization methods, mTA shows higher compatibilization efficiency and lower limitation in distribution as mTA can exert compatibilization at the interface and in PLA and PPC phases. Consequently, mTA compatibilizes the PLA/PPC blend efficiently, leading to strikingly reduced size of PPC dispersed phase and optimized interface. The mechanism is revealed to stem from the reduced interfacial tension and regulated viscosity ratio. With the improved compatibility, PLA70/PPC30/mTA4 shows an elongation at break of 307.5 ± 15.4 % and a toughness of 85.2 ± 4.5 MJ/m 3 , which is 680 % and 800 % of that of PLA70/PPC30 respectively. We envision that this work provides a novel and facile compatibilization strategy and will promote the fabrication of high-performance polymer blends.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 5
·881
·
IF 3.164
Lijun Gao,Xianggen Chen,Xiangjun Liang,Xiuzhi Guo,Xianling Huang,Caifen Chen,Xiaodan Wan,Ruyu Deng,Qifeng Wu,Lingyun Wang,Jiuying Feng
The thermoplastic poly(propylene carbonate) (PPC) containing cross-linked networks was one-pot synthesized by copolymerization of carbon dioxide, propylene oxide (PO), maleic anhydride (MA), and furfuryl glycidyl ether (FGE). The copolymers were characterized by Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) measurements. The thermal and dimensional stability of the copolymers were improved. When the MA and FGE load increased from 1 mol% to 4 mol% of PO, the copolymers contained the gel contents of 11.0%–26.1% and their yields were about double that of the PPC. The 5% weight-loss degradation temperatures (Td,-5%) and the maximum weight-loss degradation temperatures (Td,max) increased from 149.7–271.3 °C and from 282.6–288.6 °C, respectively, corresponding to 217.1 °C and 239.0 °C of PPC. Additionally, the hot-set elongation tests showed that the copolymers exhibited elasticity and dimensional stability with the minimum permanent deformation of 6.5% which was far less than that of PPC of 157.2%, while the tensile strengths were a little lower than that of PPC because of the following two conflicting factors, cross-links and flexibility of the units formed by the introduced third monomers, MA and FGE. In brief, we provide a novel method of one-pot synthesis of PPC containing cross-linked networks. According to this idea, the properties would be more extensively regulated by changing the cross-linkable monomers.Keywords:poly(propylene carbonate);networks;copolymerization;modification
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Lixin Song,Weihan Chi,Qian Zhang,Jiannan Ren,Bing Yang,Fei Cong,Yongchao Li,Wei Wang,Xianliang Li,Yuanxia Wang
Using a solvent-free radical grafting technique, glycidyl methacrylate (GMA) and maleic anhydride (MAH) were used as functionalized graft monomers, styrene (St) as a copolymer monomer, and grafted onto polylactic acid (PLA). A series of PLA -g- (GMA/MAH -co- St) graft copolymers were prepared by adjusting the GMA/MAH ratio. Subsequently, the prepared graft copolymers were used as a compatibilizer with PLA and polypropylene carbonate (PPC) for melt blending to prepare PLA/PPC/PLA -g- (GMA/MAH -co- St) blends. The effects of changes in the GMA/MAH ratio in the graft copolymer on the thermodynamics, rheology , optics, degradation performance, mechanical properties, and microstructure of the blend were studied. The results found that GMA, MAH, and St were successfully grafted onto PLA, and the PLA -g- (GMA/MAH -co- St) graft copolymer obtained from the reaction had a good toughening effect on the PLA/PPC blend system, which significantly improved the mechanical properties of the PLA/PPC/PLA -g- (GMA/MAH -co- St) blend without reducing its degradation performance, resulting in a biodegradable blend material with excellent comprehensive performance. In the PLA -g- (GMA/MAH -co- St) grafting reaction system, when GMA/MAH = 1.5/1.5 ( w /w), the grafting degree of the graft copolymer increased most significantly, from 0.83 phr to 1.51 phr. This composition of graft copolymer can effectively improve the compatibility between PLA and PPC. The resulting PLA/PPC blend can maintain good melt flow properties (MFR of 14.51 g/10 min), high transparency, and low haze (light transmittance of 91.56 %, haze of 20.5 %), while significantly improving its thermal stability ( T 95% , T max , and E t increased by 12.87 °C, 20.33 °C, and 32.00 kJ/mol, respectively). Moreover, when introducing PLA -g- (GMA/MAH -co- St) (GMA/MAH = 1.5/1.5 (wt/wt)) graft copolymer into the system, the toughness of the PLA/PPC/PLA -g- (GMA/MAH -co- St) blend system is optimal, with the notch impact strength and fracture elongation increasing to 184.6 % and 535.4 % of the PLA/PPC blend, respectively, at which point the fracture surface of the impact sample shows a wrinkled fracture feature indicative of toughness.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
PubMed
高影响因子
E-POLYMERS
·
2021
·Vol. 21
·期 1
·511-519
·
IF 2.025
Yi-Le Zhang,Wen-Zhen Wang,Li Wang,Lei-Lei Li,Kai-Yue Zhang,Sai-Di Zhao
Poly(propylene carbonate) (PPC) is an emerging low-cost biodegradable plastic with potential application in many fields. However, compared with polyolefin plastics, the major limitations of PPC are its poor mechanical and thermal properties. Herein, a thermoplastic PPC containing cross-linked networks, one-pot synthesized by the copolymerization of carbon dioxide, propylene oxide, and 4,4ʹ-(hexafluoroisopropylidene) diphthalic anhydride, had excellent thermal and mechanical properties and dimensional stability. The weight-average molecular weight and the polymer yield of the PPC5 were up to 212 kg mol −1 and 104 g polym g cat
−1 , respectively. The 5% thermal weight loss temperature reached 320°C, and it could withstand a tensile force of 52 MPa. This cross-linked PPC has excellent properties and is expected to be used under extreme conditions, as the material can withstand strong tension and will not deform.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Yu Liu,Longlong Chen,Jiangbin Su,Jinmei Bai,Zuming He
In this study, amorphous WO 3 thin films were deposited on indium-tin oxide substrates using radio frequency magnetron sputtering. Anhydrous ethanol (AE) and propylene carbonate (PC) served as binary solvents, with the WO 3 films evaluated in AE + PC-LiClO 4 electrolytes. By adjusting the volume percentage of AE, the physical properties of the electrolytes were modified to improve the fluidity and wetting behavior. The analysis of several aspects, such as migration of ions, capillary flow of electrolyte and electrochemical reaction rate, highlights the important influence of AE + PC binary solvent in reducing the response time. Notably, WO 3 films in AE + PC-LiClO 4 electrolyte with a 7/8 volume percentage of AE demonstrated exceptional optical modulation (Δ T = 75.7 %) and fast response times ( t c = 6.41 s, t b = 2.29 s), alongside shortened the diffusion path, increased ion diffusion coefficients ( D a =4.4678 × 10 −10 cm 2 /s, D c = 8.2968 × 10 −10 cm 2 /s) and electrochemical active area. Based on these efforts, the feasibility of applying AE + PC binary solvent to WO 3 electrochromic thin films has been confirmed. These results offer valuable insights for the development of efficient electrolytes and their application in electrochromic devices.
研究领域:
材料科学
·
电化学
✓ 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）