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Experimental Study of the Influence of Intrinsic Parameters on the Thermal Reactivity of Sawdust, polyethylene terephthalate and Composite

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Journal of Materials Science and Chemical Engineering 2024年第3期12卷 9-20页

作者： Ange Brel Boukongou Timoléon Andzi Barhé Applied Chemistry Research Laboratory (LARCA) Ecole Normale Supérieure (ENS) Marien NGOUABI University (UMNG) Brazzaville Congo

Several works have been based on the study of thermal variations in biomass to derive more valuable products such as fuels capable of replacing oil in the event of a crisis or activated carbon used as an adsorbent material, widely used in industry for the elimination of unwanted materials, both in liquid and gaseous environments. A study of thermal parameters such as: heating speed, retention time, drying temperature, carbonization temperature, particle size, was carried out with the aim of determining the characteristic factors of the carbonization of polyethylene terephthalate (PET), sawdust (SC) and sawdust/polyethylene terephthalate (CPS) mixture. The results of the immediate analysis revealed a very low level of ash in PET (0.013%) compared to the level of ash in sawdust (2.9%), as well as a high level of fixed carbon (82.960%), which suggests the presence of mineral oxides and a significant carbon matrix unlike PET, which indicates a very significant organic matrix (essentially made up of organic matter) with the absence of mineral oxides. The study of thermal parameters showed the water loss from Sawdust (SC) and the Sawdust/polyethylene terephthalate (CPS) mixture, an increase with temperature, unlike that of PET whose variation is essentially zero. Without heat treatment, sawdust alone contains approximately 7% water. The optimal drying temperature for this study is 110˚C for a stay of 24 hours. It appears that the largest mass losses for the PET samples are between 87.19% and 96.05%, followed by that of the mixture, between 47.33% and 64.37%. And the lowest are observed, those of sawdust (from 24.02% to 62.6%). However, here we can say that the influence of the mass is not great, given the slight difference between the losses by temperature. The results of the study of the influence of grain size showed that the differences are insignificant, even if we vary the diameter of the grains from simple to triple. To better minimize physical constraints such as t

关键词： Intrinsic Parameters Thermal Reactivity Sawdust polyethylene terephthalate Composite

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Surface characterization of polyimide and polyethylene terephthalate membranes toward plasma and UV treatments

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Progress in Natural Science:Materials International 2022年第3期32卷 314-327页

作者： Thi Sinh Vo Tran Thi Bich Chau Vo School of Mechanical Engineering Sungkyunkwan University Department of Industrial Management Can Tho University

This study is to bring an overview on various methods regarding the surface treatment performed on different polymeric membranes in relation to a deference between the treatment mechanism and their chemical ***, plasma and UV surface treatments(PST and UST) were utilized to treat the surfaces of two commercial membranes, i.e., aromatic polyimide and polyethylene terephthalate for various durations using a discharge electrode and an UV LED curing system, respectively. Based on the effects of PST and UST processes on the surface of these membranes, their surface properties have been characterized to surface morphology and hydrophilicity(or wettability), at same time the changes have probably occurred on their surface during the PST and UST processes. As a result, their hydrophilic behavior was significantly enhanced after conducting these treatment processes based on the investigation of water contact angle. Moreover, Fourier-transform infrared and Raman spectroscopy manifested the changes in the chemical bonds, interactions and orientations of molecules, which confirmed the apparition and insertion of polar functional groups after the surface treatments, and accordingly,their wettability was enhanced significantly. Also, optical microscopy images showed direct impactions on their surface and the evidence of slight surface aging/damage during the treatment processes based on the presentation of the strange streaks on the treated surfaces. In particular, the peel forces exhibited an increase comparing to the initial membranes, which is characteristically for enhancing their adhesion behavior. Hence, these results are needful for improving the surface properties of a material, and obtaining better adhesion behavior on the membrane-like materials and recycling polymer materials.

关键词： Plasma treatment UV treatment Polymeric membrane Aromatic polyimide polyethylene terephthalate

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Microwave Catalytic Depolymerization of polyethylene terephthalate Plastic to the Monomers

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CCS Chemistry 2023年第12期5卷 2818-2831页

作者： Zhe Yuan Jianlong Yang George Manos Junwang Tang Department of Chemical Engineering University College LondonLondon WC1E 7JE(United Kingdom) Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education The Energy and Catalysis HubCollege of Chemistry and Materials ScienceNorthwest UniversityXi’an Industrial Catalysis Center Department of Chemical EngineeringTsinghua UniversityBeijing

Plastic waste management has emerged as a critical environmental issue due to the exponential increase in plastic consumption *** terephthalate(PET)is extensively used in the production of water bottles,which constitutes a significant fraction of the plastic *** recycling is a challenging task due to the lack of efficient and cost-effective depolymerization *** this study,we developed a microwave(MW)catalytic depolymerization method for PET recycling using modified zinc oxide loaded with manganese oxide as a *** modified Mn_(3)O_(4)/ZnO catalyst presents high efficiency in depolymerizing PET into its monomers with only 0.4 wt% ratio of the catalyst to PET at 175℃ for 5 min,resulting in 100% conversion of PET and 88% selectivity toward bis-hydroxyethyl terephthalate *** is believed that Mn_(3)O_(4)provides additional Lewis acid sites,promoting the dissociation of glycol from PET,and the MW irradiation plays a crucial role in rapidly heating the ethylene glycol and the catalyst,thereby accelerating the PET depolymerization *** addition,the heterogeneous nature of the catalyst facilitates its easy separation from the reaction mixture for reuse,simplifying the catalyst recovery process and enabling costeffective and sustainable PET ***,this study provides an innovative and sustainable solution for PET recycling,contributing toward the circular economy and mitigating the environmental impact of plastic waste.

关键词： polyethylene terephthalate plastic recycling microwave catalysis depolymerization bishydroxyethyl terephthalate monomers

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DEPOLYMERIZATION AND KINETICS OF DEPOLYMERIZATION OF polyethylene terephthalate USING DIBUTYLTIN OXIDE CATALYST

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Chinese Journal of Polymer Science 2006年第2期24卷 139-145页

作者： T.Naruephat D.Somsak V.Tharapong P.Amorn Department of Chemical Technology Faculty of Science Chulalongkorn UniversityBangkok 10330Thailand

Depolymerization of poly（ethylene terephthalate）（PET） was performed in the tubular bomb microreactor which contained the solution of PET in methanol and dibutyltin oxide at the temperature ranging from 433 K to 473 K, the reaction time from 5 to 45 min and the catalyst-to-PET ratio of 0.3%-2% by weight. The optimal condition for PET depolymerization catalyzed by dibutyltin oxide is the temperature of 443-453 K, the reaction time of 20-25 min and 0.8% by weight of catalyst. By using differential methods, the activation energy for the depolymerization process was found to be 154.05 kJ/mol in the temperature range from 433-463 K.

关键词： Depolymerization polyethylene terephthalate Dibutyltin oxide Degradation Kinetics

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Effect of polyethylene terephthalate Plastic Waste on the Physico-Mechanical and Thermal Characteristics of Stabilized Laterite Bricks

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Open Journal of Applied Sciences 2023年第6期13卷 910-920页

作者： Aboubacar Sidiki Toure Moussa Tamboura Antoine Padou Diarra Adama Coulibaly Dodo Kayentao Kélétigui Daou Mah Fatoumata Traore Faculty of Sciences and Techniques (FST) Materials Chemistry Laboratory University of Science Techniques and Technologies of Bamako Bamako Mali National Research and Experimentation Center in Building and Public Works (CNREX-BTP) Soil Mechanics and Road Engineering Laboratory Ministry of Transport and Equipment Bamako Mali National School of Engineers-Abderhamane Baba TOURE (ENI-ABT) Applied Thermal Laboratory University of Science Techniques and Technologies of Bamako Bamako Mali

The present work investigated the effect of polyethylene terephthalate (PET) plastic waste on the physico-mechanical and thermal properties of cement-stabilized laterite bricks to see the durability of the modified bricks (CSLB). Samples were formulated by mixing laterite, cement, and different percentages of PET (0%, 3%, 5%, and 7%) by volume. The bricks were produced using the M7MI Hydraform standard interlocking block and kept in the shade for a curing period of 28 days. The addition of 3% to 5% PET to the laterite stabilized with 10% cement results in a decrease in both dry and wet compressive strength, which is determined using the Controlab compression machine. However, the obtained results are in concordance with the standards. The thermal conductivity of CSLB, determined using the box method with the EI700 measurement cell, decreases as the PET content of the mixture increases. A decrease in bulk density from 1.67 to 1.58 g/cm3 was observed.

关键词： Plastic Waste polyethylene terephthalate Laterite Bricks Cement Stabilization Thermal Conductivity

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Experimental and Performance Analyses on Elastomer-Strengthened polyethylene terephthalate/Glass Fiber Blends

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Automotive Innovation 2019年第1期2卷 71-78页

作者： Qili Shen Xu Li Ying Zhao Xiaoyu Gu Weijian Zou Xiangdong Huang Wenfeng Mao Guangzhou Automobile Group Co. LtdGuangzhou 511434China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130021China School of Materials Science and Engineering South China University of TechnologyGuangzhou 510641China

Ethylene-methacrylate-glycidyl(EMG)copolymer is employed to strengthen polyethylene terephthalate(PET)/glass fiber(GF)*** paper starts from investigating the effects of various EMG contents on mechanical properties,thermal properties and fractured surface morphology of PET/GF *** of the above-mentioned properties own extreme limits of EMG *** crystallization ability of the blends increases with an increment in EMG content,whereas the crystallinity keeps stable at a relatively high level of 0-20 wt.%EMG *** tension,bending and impact properties of PET blends are enhanced with the addition of a self-made three-dimensional hierarchical porous carbon sponge(3DC)based on an optimal additive *** indicate that EMG possesses the capabilities of increasing the toughness of PET/GF blends remarkably and transforming the blends from brittle fracture to tough *** to the results,the blends exhibit the best overall properties as the content of EMG reaches 10-15 wt.%.

关键词： polyethylene terephthalate Glass fiber Thermoplastic elastomer Experimental preparation Performance analysis

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Electrodeposition of calcium phosphate onto polyethylene terephthalate artificial ligament enhances graft-bone integration after anterior cruciate ligament reconstruction

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Bioactive Materials 2021年第3期6卷 783-793页

作者： Jiangyu Cai Qianqian Zhang Jiebo Chen Jia Jiang Xiumei Mo Chuanglong He Jinzhong Zhao Department of Sports Medicine Shanghai Jiao Tong University Affiliated Sixth People's HospitalShanghai200233China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of ChemistryChemical Engineering and BiotechnologyDonghua UniversityShanghai201620China

It is a big challenge to develop a polyethylene terephthalate(PET)artificial ligament with excellent osteogenetic activity to enhance graft-bone integration for ligament ***,we evaluated the effect of biomineralization(BM)and electrodeposition(ED)method for depositing calcium-phosphate(CaP)on the PET artificial ligament in vitro and in *** electron microscopy and energy-dispersive X-Ray spectrometer mapping analysis revealed that the ED-CaP had more uniform particles and element distribution(Ca,P and O),and thermogravimetric analysis showed there were more CaP on the PET/ED-CaP than the PET/BM-CaP ***,the hydrophilicity of PET scaffolds was significantly improved after CaP *** vitro study showed that CaP coating via BM or ED method could improve the attachment and proliferation of MC3T3-E1 cells,and ED-CaP coating significantly increased osteogenic differentiation of the cells,in which the Wnt/β-catenin signaling pathway might be *** addition,radiological,histological and immunohistochemical results of in vivo study in a rabbit anterior cruciate ligament(ACL)reconstruction model demonstrated that the PET/BM-CaP and PET/ED-CaP scaffolds significantly improved graft-bone integration process compared to the PET *** importantly,larger areas of new bone ingrowth and the formation of fibrocartilage tissue were observed at 12 weeks in the PET/ED-CaP group,and the biomechanical tests showed increased ultimate failure load and stiffness in PET/ED-CaP group compared to PET/BM-CaP and PET ***,ED of CaP is an effective strategy for the modification of PET artificial ligament and can enhance graft-bone integration both in vitro and in vivo.

关键词： Electrodeposition Calcium-phosphate Graft-bone integration polyethylene terephthalate Artificial ligament

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TSC STUDIES ON SUB-Tg STORAGE OF polyethylene terephthalate

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Chinese Journal of Polymer Science 1987年第4期5卷 285-291页

作者：李炜童刚周漪琴漆宗能 Academia Sinica Academla sinica Beijing Beliing Department of Applied Chemistry Hefei Hefei Institute of Chermstry Institute of Chemistry University of Science and Technology of China

The Thermally Stimulated Current （TSC） spectra of a series of Sub-T;annealed polyethylene terephthalate （PET） specimens have been measured. It is found that there is only one peak at 80℃above room temperature, which related to the thermo-relaxation of frozen-in dipoles. The activation energy of such dipole motion has been calculated. The relation between the maximum current and the storage time can be explained by the free volume theory and agrees with the results from the excess thermodynamic properties. Compared with Differential Scanning Calorimeter （DSC） and tensile stress-strain method, TSC is a simpler and more sensitive method in studying Sub-T;annealed polymers.

关键词： polyethylene terephthalate Sub-T_θ Storage TSC Studies.

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Towards recycling purpose:Converting PET plastic waste back to terephthalic acid using pH-responsive phase transfer catalyst

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Chinese Journal of Chemical Engineering 2022年第11期51卷 53-60页

作者： Yueqing Wang Hongxing Wang Hongmei Chen Hantao Liu School of Energy and Power Engineering North University of ChinaTaiyuan 030051China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China School of Instrument and Electronics North University of ChinaTaiyuan 030051China

Converting polyethylene terephthalate(PET)wastes to its monomer and valuable chemicals via ecofriendly chemical method is still a challenge ***,phase transfer catalysts used for alkaline hydrolysis were soluble in reaction media and hardly separated after ***,we reported several pH-responsive catalysts combined alkyl quaternary ammonium units with heteropolyacid anion for achieving stepwise product/catalyst separation and catalyst *** properties of homogeneous/heterogeneous transfer behavior allow catalyst to be easily separated from reaction media by adjusting of pH *** them,[C_(16)H_(33)N(CH_(3))_(3)]_(3)PW_(12)O_(40)(abbreviated as[CTA]_(3)PW)exhibits the highest activity and the most suitable pH responsive *** a pH triggered switchable catalytic system not only shows good performance for depolymerization of pure PET,but also some real PET wastes such as coloured trays and PE/PET complex films could be completely degraded into terephthalic ***,the reaction kinetics and activation energy of PET alkaline hydrolysis also studied with and without pH-responsive[CTA]_(3)PW.

关键词： polyethylene terephthalate Alkaline hydrolysis pH-responsive catalyst Terephthalic acid

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Efficient Photocatalytic Degradation of the Persistent PET Fiber‑Based Microplastics over Pt Nanoparticles Decorated N‑Doped TiO_(2) Nanoflowers

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Advanced Fiber Materials 2022年第5期4卷 1094-1107页

作者： Dawang Zhou Hongxia Luo Fangzhou Zhang Jing Wu Jianping Yang Huaping Wang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Co‑Innovation Center for Textile Industry Innovation Center for Textile Science and TechnologyDonghua UniversityShanghai 201620China

Fiber-based microplastics(FMPs)are highly persistent and ubiquitously exist in the wastewater of textile industry and urban *** remains challenging to completely remove such newly emerged organic pollutants by the predominant physical *** this work,we investigated a photocatalytic degradation catalyzed by TiO_(2) catalyst to demonstrate the feasibility of implementing efficient chemical protocol to fast degrading polyethylene terephthalate(PET)-FMPs(a major FMP type existing in environment).The result shows that a hydrothermal pretreatment(180℃/12 h)is necessary to induce the initial rough appearance and molecular weight *** the comprehensive action of the nano-flower shaped N doped-TiO_(2) catalyst(Pt@N-TiO_(2)-1.5%)on the relatively low molecular weight intermediates,an approximate 29%weight loss was induced on the pretreated PET-FMPs,which is about 8 times superior to the untreated *** work not only achieves a superior degradation effect of PET-FMPs,but also provides a new inspiration for the proposal of reduction strategies in the field of environmental remediation in the future.

关键词： Microplastics Fiber-based microplastics polyethylene terephthalate Photocatalytic degradation Hydrothermal pretreatment

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