JOURNAL OF THE ENERGY INSTITUTE
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2025
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IF 6.2
Yueping Liu,Suning Li,Yongcheng Yang,Yongxiang Liang,Fei Wang,Xuetong Li,Deng Zhao,Yanjun Lu,Hui Liu,Shuai Guo
The aim of this study is to investigate the role of different carbon-based structures on the pyrolysis pathway and gas product distribution of polypropylene (PP). Using in situ DRIFTS coupled with thermogravimetric mass spectrometry, this study investigated the synergistic mechanisms between polypropylene (PP) and common plastics and biomass at the molecular level. The following mechanisms were revealed: 1) Polyethylene erephthalate (PET) induces demethylation of PP through oxygenated fragments, which weakens the stability of its main chain and synergistically reduces the pyrolysis temperature. The high-temperature polyene structure of polyvinyl chloride (PVC) promotes further breakage of the PP main chain, synergistically driving the directional conversion of gas products to unsaturated hydrocarbons and chlorine-containing compounds. The phenyl groups in polystyrene (PS) trigger PP activation at low temperatures, improving the yield of toluene gas. 2) PP inhibits the decomposition of blended components through physical entanglement at low temperatures. At high temperatures, polyenes, phenyl groups and other cleavage products reorganize with PP hydroxyl fragments, promoting the enrichment of olefins, aromatics and chlorinated compounds. 3) In PP-biomass systems, it is hypothesized that the PP pyrolysis pathway is altered, enhancing the selectivity for short-chain hydrocarbons and monocyclic aromatics. This effect is likely mediated through ash-catalyzed reactions and induction by oxygen-containing fragments. This study employs in situ Fourier-transform infrared (FTIR) spectroscopy to monitor in real time the molecular-level evolution of PP-based mixed waste plastics and biomass pyrolysis, revealing fundamental carbon-chain structure-property relationships. These findings establish a mechanistic framework for the rational design of high-efficiency pyrolysis systems with precisely controlled product distributions through synergistic interactions.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2013
·Vol. 24
·期 9
·807-813
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IF 1.635
Tao Han,Yi Zhang,Qiaoying Cao,Siwei Liu,Zhenguo Chi,Jiarui Xu
A series of novel optically active poly(ester-imide)s (ter-PEIs) with high glass transition temperature ( T g ), good thermal stability, and solubility were successfully designed and synthesized by direct polycondensation reactions, using p-hydroxybenzoic acid (PHB), 4,4’-dihydroxybenzophenone, and a chiral diacid, N , N '-(pyromellitoyl)-bis-L-phenylalanine diacid as monomers. The resulting terpolymers were characterized by 1 H-NMR, FTIR, element analysis, thermogravimetric analysis, different scanning calorimeter and wide-angle x-ray diffraction, etc. The ter-PEIs are amorphous polymers with good heat resistance and high T g s. They are soluble in many common polar organic solvents and show optically rotation property. The specific rotation values of the ter-PEIs increase with the molar ratio of the chiral diacid, and the rigid PHB monomer is beneficial to increase the T g s of the polymers. Copyright © 2013 John Wiley & Sons, Ltd.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
DESALINATION
·
2014
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IF 3.96
Guoqing Wang,Lan Yang,Zhe Chen,Wanmin Ruan,Jianli Wang,Baoku Zhu
An amphiphilic terpolymer P(MMA-BA-PEOM) was synthesized by free radical polymerization and used as the macromolecular additive in the preparation of PVDF blend membranes. The glass transition temperature (T g ) of terpolymers was controlled with a wide range from − 6 to 40 °C by adjusting the feed ratio of rigid monomer MMA to soft monomer BA . The increase of static contact angle of copolymer with PBA content indicated that softer chain can facilitate the hydrophobic parts of the additive segregation to the surface of a polymer film at the solid–air interface. The observation of morphology of the extracted PVDF blend membrane verified that P(MMA-BA-PEOM) could facilitate the surface segregation. Filtration experiment showed that PVDF membrane modified by terpolymer P(MMA-BA-PEOM) has a higher pure water flux (365 L m − 2 h − 1 ) and relative flux recovery (71%) than that modified by bipolymer P(MMA-co-POEM).
研究领域:
材料科学
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膜技术
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产品关联
DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Yanru Chen,Linbo Wu,Bo-Geng Li
Poly(1,5-pentylene-co-2,2,4,4-tetramethyl cyclobutylene terephthalate) (PPecBT) random copolyesters glass transition temperature up to 136 °C were synthesized through two-step melting polycondensation of dimethyl terephthalate (DMT) or terephthalic acid (TPA), 2,2,4,4-tetramethyl-1,3-cyclobutanediol (CBDO) and 1,5-pentanediol (PeDO). They were characterized and assessed with intrinsic viscosity , 1 H NMR, DSC , TGA , tensile and impact testing as well as melt foaming observation. Using PeDO as a diol comonomer was helpful to depress CBDO sublimation and pipeline blocking, and to reduce the composition and cis -trans ratio deviations between monomer and copolymer . The presence of PeT repeat unit in PPecBT was beneficial to improve the thermal stability of PPecBT and to reduce undesired melt foaming and volume expansion during melt processing. The T g of these amorphous copolymers is determined by intrinsic viscosity, copolymer composition and cis -cB unit fraction, and a quantitative relationship among them is established. Futhermore, these PPecBTs showed superior tensile ductility as well as strength and modulus.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
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2023
·Vol. 61
·期 9
·818-828
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IF 3.4
Dongwu Li,Dandan Li,Zhao Ke,Qian Gu,Ke Xu,Chunhai Chen,Guangtao Qian,Gang Liu
Colorless polyimides (CPIs) with superheat resistance and low coefficient of thermal expansion (CTE) are required urgently to employ as plastic substrates in flexible-display devices. To attain the target properties, 2-(2-methyl-4-(4-aminobenzamido)phenyl)-5-(4-aminobenzamido)- N -phenylbenzimidazol (AB-MPBZ) that contains biamide was synthesized, and its homo- and co-polyimides were prepared with 1,2,4,5-cyclohexanetetracarboxylic dianhydride (HPMDA) and cyclobutane-1,2,3,4-tetracarboxylic dianhydride (CBDA). The crank-shaft-like amide groups effectively increases the linearity and stiffness of polymer segments, providing CPI films with low CTE. On the basis, the CBDA based poly(benzimidazole imide) (PBII) series with dense interchain packing exhibits further reduced CTE down to 22 ppm K −1 and increased glass-transition temperature ( T g ) up to 404 °C. Such good thermal properties indicate that the resultant copolyimides have potential applications as colorless flexible substrates. These provide a feasible approach to balance thermal and optical performance of polyimides. Graphical
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
ACS Omega
·
2018
·
IF 0
Cunji Gao,Xiaohua Liang,Zhengxi Guo,Bang-Ping Jiang,Xiaoming Liu,Xing-Can Shen
In this study, we have evaluated a water-soluble, nontarget reagent and a carrier-free diiron hexacarbonyl complex, [Fe2{μ-SCH2CH(OH)CH2(OH)}2(CO)6] (TG-FeCORM), that can induce the site-specific release of carbon monoxide (CO) in cancer cells triggered by endogenous glutathione (GSH). The releasing rate of CO was dependent on the amount of endogenous GSH. Being the amount of endogenous GSH higher in cancer cells than in normal cells, the CO-releasing rate resulted faster in cancer cells. Moreover, the anti-inflammatory properties related to the intracellular CO release of TG-FeCORM were also confirmed in the living HeLa cells.
研究领域:
药理学
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肿瘤学
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化学
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细胞生物学
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产品关联
DOI
PubMed
FUEL
·
2024
·
IF 6.7
Li Zhou,Fashe Li,Wenchao Wang,Huicong Zhang,Yaozong Duan,Hua Wang
Phospholipids, as key trace constituents of biodiesel, can have complex effects on the performance of biodiesel. Exploring the mechanism of their influence on the pyrolysis and oxidation characteristics of biodiesel is crucial for controlling the generation and emission of pollutants. To this end, this study employed TG-FTIR-MS experimental technology and the ReaxFF-MD simulation method to investigate the effects of phosphatidylethanolamine (PE) on the activation energy ( E a ), gaseous product generation, and mechanism of Jatropha biodiesel pyrolysis and oxidation reactions. The results indicated that the addition of 400 ppm PE can reduce the pyrolysis E a of Jatropha biodiesel from 87.25 kJ/mol to 80.67 kJ/mol, consistent with simulated E a of 93.35 kJ/mol and 81.81 kJ/mol, respectively. This notably promoted the initial oxidation stage of the Jatropha biodiesel reaction, facilitating the generation of oxidation products such as CO and C 2 H 4 . In the pyrolysis reaction, PE promoted C 2 H 4 formation, primarily through reactions involving hydrocarbon small free radicals. In the oxidation reaction, the addition of PE increased the number and variety of active free radicals in the system, with the formation reactions of H 2 O and CH 2 O involving phosphorus-containing oxygen groups. Furthermore, a small amount of nitrogenous free radicals participates in the formation reactions of C 2 H 4 and CO.
研究领域:
能源科学
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化学工程
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环境科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2026
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IF 7.8
Yining Wang,Yu Deng,Yijia Yao,Yaoxin Xie,Mingyuan Ma,Cheng Liu,Xigao Jian,Yousi Chen
Constructing fiber–matrix interfaces that simultaneously possess thermal stability and adaptive responsiveness remains a critical challenge for high-temperature thermoplastic composites. Herein, a Tg-difference-driven dual-component colloidal suspension sizing strategy is proposed to achieve controllable interfacial evolution in carbon fiber-reinforced poly(phthalazinone ether sulfone ketone) (CF/PPESK) composites. By codepositing a rigid poly(amic acid) salt (PAAs) precursor and a flexible sulfonated poly(phthalazinone ether sulfone ketone) (SPPESK) in an aqueous medium onto the carbon fiber surface, a spontaneous phase reconstruction occurs during hot-press processing due to differences in chain mobility and Tg. The high-Tg PI segments assemble into a rigid skeleton adjacent to the fiber surface, while the low-Tg PPESK segments interdiffuse with the matrix, forming a compliant penetration layer and molecular bridging structures. Such a synergistic interfacial architecture markedly enhances interfacial wettability, chemical compatibility, and mechanical stability. The resulting composites exhibit an interlaminar shear strength (77.6 MPa) and flexural strength (1705 MPa) that are increased by 41.3% and 43%, respectively, relative to the desized fibers, while retaining over 60% of the mechanical performance at 250 °C. AFM modulus mapping reveals a smooth modulus-gradient interphase of ∼300 nm, confirming the molecular interpenetration and dynamic reconstruction mechanism at the rigid-flexible synergistic interface. This sizing strategy is also applicable to PPBESK matrices containing biphenyl units and various reinforcement forms (fabrics and short fibers), enabling universal interfacial strengthening and substantial wear-resistance improvement. The concept of Tg-difference-driven dynamic adaptive interfacial design thus provides a water based, environmentally benign, and widely applicable paradigm for high-performance thermoplastic carbon fiber composites.
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Chenguang Zhang,Zilu Zhang,Chuancheng Dongye,Xiaofei Xu,Zhihe Li,Weiming Yi,Xiaobo Chen,Shaoqing Wang
Spent bleaching clay (SBC) and lignin wastes are generated from oil refining and paper industries, respectively. The complementary properties of these two types of waste enable synergistic effects in co-pyrolysis, thereby mitigating limitations characteristic of single-component pyrolysis. In this study, the co-pyrolysis behavior of the two wastes was explored at the microscopic molecular level using simultaneous TG-FTIR technology, coupled with fixed-bed pyrolysis experiments. The co-pyrolysis behavior was systematically investigated at the mass ratio of lignin and SBC (0 %L, 30 %L, 50 %L, 70 %L, and 100 %L) and different reaction temperatures (450, 500, 550, 600, and 650 °C). The results showed that the activation energy required for co-pyrolysis decreased at 50 %L and 70 %L ratios, as determined using FWO and KAS methods. The Ea required for co-pyrolysis decreased at 50 %L and 70 %L ratios. Specifically, the addition of 30 % SBC reduced the activation energy of lignin from 141.67 kJ/mol (KAS) and 146.41 kJ/mol (FWO) to 120.25 kJ/mol (KAS) and 126.04 kJ/mol (FWO), respectively. Furthermore, the 50 %L radio infrared absorbance of CH 4 and CO 2 was relatively strong due to the enhanced decarboxylation and demethoxylation reactions. Meanwhile, the fixed-bed co-pyrolysis experiment showed that the relative content of non-methoxy phenolics increased from 7.0 % to 10.6 % with bio-oil yield increasing from 27 % to 40 %, after adding 50 % SBC. Additionally, the interaction mechanism was proposed based on the TG-FTIR and fixed-bed pyrolysis experimental results. SBC served as a hydrogen donor to promote the thermal decomposition of lignin and improved the yields of phenol and alkylphenols. This work offers guidance for the synergistic conversion of renewable carbon sources with oily solid wastes.
研究领域:
环境科学与工程
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能源化工
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废弃物资源化
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热化学转化
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生物质能
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 75
·47738-47745
·
IF 3.108
Kunquan Li,Xingrong Zeng,Xuejun Lai,Shengyong Chai
Fluorine-containing acrylates (FACs) with different glass transition temperature (Tg) were synthesized by solution copolymerization, and then the superhydrophobic coatings were fabricated based on the FAC, micro-SiO2 (M-SiO2) and nano-SiO2 (N-SiO2) particles through a two-step spray method. The prepared FAC was characterized by Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance (1H-NMR) and differential scanning calorimetry (DSC). The wetting behavior and surface morphology of the superhydrophobic coating were studied. The resistance and mechanism of the superhydrophobic coating against abrasion were also investigated. FTIR and 1H-NMR showed that the fluorinated-containing monomer had copolymerized with the acrylate monomers, and FACs with different Tg of about 74.2 °C, 24.5 °C, −7.7 °C and −29.5 °C were prepared. After coating with FAC/M-SiO2/N-SiO2 composite coating, the surface showed hierarchical structures with a roughness (Sa) of 1.23 mm, and became superhydrophobic with a water contact angle higher than 150° and a low sliding angle lower than 5°. Abrasion testing showed that the superhydrophobic coating fabricated based on the FAC polymer with low Tg had better abrasion resistance in comparison with that of the FAC polymer with high Tg. Meanwhile, the M-SiO2 in the composite coating could weaken the abrasion force to the surface micro roughness damage and acted as connections for the adhesion of N-SiO2 particles during abrasion, which ensured the binary micro/nano structures required for good hydrophobicity after abrasion.
研究领域:
材料科学
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表面化学
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产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2023
·
IF 6
Mengqi Zhong,Jinping Li,Lun Zhou,Teng Wang,Jingxin Liu,Meng Mei,Si Chen
This research investigates the mechanism of co-pyrolysis in waste-blended textiles (polyester/cotton blends). Thermogravimetry and mass spectrometry analysis were utilized to study the mass loss behavior and gas emission characteristics of cellulose (CE) and polyethylene terephthalate (PET) with various mass ratios during pyrolysis. The EA, BET and FTIR analysis were used to investigate the interaction among the solid phase products. The findings revealed a clear synergistic effect between CE and PET. When the theoretical and actual thermogravimetry/gas release curves were compared, the synergistic effect in the co-pyrolysis process inhibited a release of small volatile substances (H 2 , CH 4 , C 2 H 2 , CO and CO 2 ) at high temperatures and directly promoted hydrocarbon enrichment in solid products, which could affect the adsorption performance of solid phase products, and the inhibition effect was strongest when the ratio was 35:65.
研究领域:
能源与环境科学
·
材料科学
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2025
·
IF 3.9
Zhe Wang,Wen-Cong Xu,Dachuan Zhang,Man Gao,Tao Chen,Youyi Sun,Shuofeng Liang,Si Wu
Molecular weight serves as a critical parameter governing the adhesive properties of polymer adhesives. Nevertheless, its influence on the reversible adhesion of azopolymers exhibiting photoinduced reversible solid-to-liquid transitions remains poorly understood. Here, we systematically elucidate how molecular weight modulates the reversible adhesion behavior of azopolymers. Three azopolymers (P1, P2, and P3) were synthesized by ring-opening metathesis polymerization (ROMP), with molecular weights strategically designed below, near, and above the entanglement molecular weight (Me), respectively. UV irradiation induces trans-to-cis isomerization of azobenzene moieties, while visible light triggers cis-to-trans isomerization. The azopolymers exhibit photoswitchable glass transition temperatures (Tgs) and viscous flow temperatures (Tfs). Crucially, molecular weight dictates the mechanism of photocontrolled reversible adhesion. For P1 and P2, the trans azopolymers exhibit stronger adhesion than the cis form does. However, this trend is reversed for P3, where the cis P3 surpass trans P3 in terms of adhesive performance. These findings establish molecular weight engineering as a critical strategy for developing high-performance stimuli-responsive reversible adhesives.
研究领域:
高分子科学
·
材料科学
·
粘附
·
光化学
·
智能材料
✓ 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）