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Compatibilization of PLA grafted maleic anhydrate through blending of thermoplastic starch(TPS)and nanoclay nanocomposites for the reduction of gas permeability

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International Journal of Smart and Nano Materials 2022年第1期13卷 130-151,I0008页

作者： Niloofar Alikarami Mahbod Abrisham Xiayan Huang Mahyar Panahi-Sarmad Kanglei Zhang Ke Dong Xueliang Xiao Key Laboratory of Eco-Jiangnan University Wuxi214122China Department of Polymer Engineering Amirkabir University of TechnologyTehran

Here,the effects of compatibilization and clay nanoparticles on the gas permeability of nanocomposites of poly-lactic acid(PLA)/thermoplastic starch(TPS)/nanoclay were *** and compatibilized PLA/TPS were tailored in the first *** starch with D-sorbitol as a plasticizer was mingled through the internal ***,the maleination method was utilized on PLA to ameliorate the compatibilization of PLA and *** this regard,maleic anhydrate(MA)has been grafted on PLA in the presence of L101 as a peroxide initiator via melt mixing to obtain *** optimum content of PLAg-MA was about 4 phr,confirmed by DMTA and ***,the presence of PLA-g-MA has moderately improved the oxygen ***,the nanocomposites of PLA and TPS containing 1%of Cloisite-30B as well as the optimum compatibilizer(4phr),were produced by melt mixing in the masterbatch module leading to the formation of an extraordinary well-dispersed structure according to XRD *** mixing order controlled the localization of *** was concluded that the inclusion of 1%nanoclay in the PLA phase reduces the oxygen permeability by 55%compared to the pristine blend due to the tortuosity effect of nanosheets that are appropriately dispersed in the matrix.

关键词： PLA/starch blend polymer nanocomposite compatibilization procedure gas permeability

EFFECT OF CHEMICAL STRUCTURE OF SULFOXIDE GRAFTED POLY (VINYL ALCOHOL) ON gas permeability

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Chinese Journal of Polymer Science 1994年第2期12卷 132-136页

作者：江东林张一烽沈之荃 Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027

The effects of chemical structure, i. e. side chain structure and their contents, on thepermeability of pure SO_2, N_2 and their mixture gases for the sulfoxide grafted poly (vinylalcohol) (RVSO-PVA) membranes have been investigated:where R=Me, Et, Pr, t-Bu and Ph. It was notable that introduction of sulfoxide group intoPVA side chain greatly enhanced the permselectivity of sulfur dioxide. SO_2 permeability andseparation factor of these polymers increased markedly as the size of side chain increased. Thesulfoxide content of the polymer also played an important role in the pure and mixture gasespermeation. Some explanations have been made to interpret this unique gas separation behaviour.

关键词： gas permeability Poly(vinylalcohol) Sulfoxide grafted Sulfur dioxide

gas permeability OF COPOLY(1-TRIMETHYL-SILYL-1-PROPYNE-PENTAMETHYL-DISILYL-1-PROPYNE) MEMBRANE

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Chinese Journal of Polymer Science 1992年第3期10卷 203-209页

作者：郑国栋 T. Nakagawa A. Higuchi K. Nagai Changchun Institute of Applied Chemistry Academia Sinica Changchun 130022 China Department Industrial Chemistry Faculty of Science and Engineering Meiji University Kawasaki JAPAN

The permeability of copoly (1-trimethylsilyl-1-propyne-pentamethyldisilyl-1-propyne) membrane for twelve gases (0_2, N_2, CO_2, H_2, D_2, He, At, CH_4, C_2H_4, C_2H_6, C_3H_6 and C_3H_8) was examined. The basic laws of solution and diffusion of the gases in the membrane were expounded preliminarily. It was found that a linear relationship between logarithm of diffusion coefficient (D) and critical molar volume (V_c) of the gases. The permeation characteristics of the gases in the copoly (1-trimethylsilyl-1-propyne-pentamethyldisilyl-1-propyne) membrane was also discussed.

关键词： gas permeability Copoly (1-trimethylsilyl-1-propyne-pentamethyldisilyl-1-propyne), Membrane.

Influence of soil density on gas permeability and water retention in soils amended with in-house produced biochar

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第3期13卷 593-602页

作者： Ankit Garg He Huang Weiling Cai Narala Gangadhara Reddy Peinan Chen Yifan Han Viroon Kamchoom Shubham Gaurav Hong-Hu Zhu Department of Civil and Environmental Engineering Guangdong Engineering Center for Structure Safety and Health MonitoringShantou UniversityShantouChina Department of Civil Engineering Kakatiya Institute of Technology and ScienceWarangalIndia Department of Civil Engineering King Mongkut’s Institute of Technology LadkrabangBangkokThailand Department of Biology Science and Biology Technology Indian Institute of Technology GuwahatiGuwahatiIndia School of Earth Sciences and Engineering Nanjing UniversityNanjing210023China

Biochar has been used as an environment-friendly enhancer to improve the hydraulic properties(*** and water retention)of ***,variations in densities alter the properties of the soil ebiochar *** density variations are observed in agriculture(loosely compacted)and engineering(densely compacted)*** influence of biochar amendment on gas permeability of soil has been barely investigated,especially for soil with different *** major objective of this study is to investigate the water retention capacity,and gas permeability of biochar-amended soil(BAS)with different biochar contents under varying degree of compaction(DOC)***-house produced novel biochar was mixed with the soil at different amendment rates(*** contents of 0%,5%and 10%).All BAS samples were compacted at three DOCs(65%,80%and 95%)in polyvinyl chloride(PVC)*** soil column was subjected to dryingewetting cycles,during which soil suction,water content,and gas permeability were measured.A simplified theoretical framework for estimating the void ratio of BAS was *** experimental results reveal that the addition of biochar significantly decreased gas permeability kg as compared with that of bare soil(BS).However,the addition of 5%biochar is found to be optimum in decreasing kg with an increase of DOC(i.e.k_(g,65%)>k_(g,80%)>k_(g,95%))at a relatively low suction range(<200 kPa)because both biochar and compaction treatment reduce the connected pores.

关键词： Biochar Degree of compaction(DOC) gas permeability Soil water retention Wettingedrying cycle

The Effect of Different Freeze-Thaw Cycles on Mortar gas permeability and Pore Structure

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Fluid Dynamics & Materials Processing 2023年第6期19卷 1623-1636页

作者： Wei Chen Ao Xu Hejun Zhang Mingquan Sheng Yue Liang Frederic Skoczylas School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhanChina CNRS Centrale LilleUMR9013-LaMcube-Laboratoire de Mécanique Multiphysique et MultiéchelleUniversitéde LilleLilleFrance

Two different freeze-thaw cycles(FTC)are considered in this study to assess the related impact on gas permeability and micro-pore structure of a *** are the water-freezing/water-thawing(WF-WT)and the air-freezing/air-thawing(AF-AT)*** problem is addressed experimentally through an advanced nuclear magnetic resonance(NMR)technique able to provide meaningful information on the relationships among gas permeability,pore structure,mechanical properties,and the number of *** is shown that the mortar gas permeability increases with the number of FTCs,the increase factor being 20 and 12.83 after 40 cycles for the WF-WT and AF-AT,*** results also confirm that gas permeability hysteresis phenomena occur during the confining pressure loading and unloading process.

关键词： Mortar freeze-thaw cycles gas permeability pore structure NMR mechanical properties

Experimental Evaluation of Compressive Strength and gas permeability of Glass- Powder-Containing Mortar

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Fluid Dynamics & Materials Processing 2023年第10期19卷 2639-2659页

作者： Yue Liang Wenxuan Dai Wei Chen School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China

Glass powder of various particle sizes(2,5,10 and 15μm)has been assessed as a possible cement substitute for *** replacement rates of cement(5%,10%,15%,and 20%)have been considered for all particle *** accessible porosity,compressive strength,gas permeability and microstructure have been investigated *** results have shown that adding glass powder up to 20%has a signiﬁcantly negative effect on the porosity and compressive strength of *** compressive strength initially rises with a 5%replacement and then ***,the gas permeability of the mortar displays a non-monotonic behavior;ﬁrst,it decreases and then it grows with an increase in the glass powder content and particle *** porosity and gas permeability attain a minimum for a 5%content and 10μm particle *** of a Nuclear magnetic resonance(NMR)technique has revealed that incorporating waste glass powder with a certainﬁneness can reduce the pore size and the number of pores of the *** with the control mortar,the pore volume of the waste glass mortar with 5%and 10μm particle size is signiﬁcantly *** cement is partially replaced by glass powder with a particle size of 10μm and a 5%percentage,the penetration resistance and compressive strength of the mortar are signiﬁcantly improved.

关键词： Waste glass powder mortar porosity gas permeability compressive strength NMR

An Investigation into the Compressive Strength,permeability and Microstructure of Quartzite-Rock-Sand Mortar

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Fluid Dynamics & Materials Processing 2024年第4期20卷 859-872页

作者： Wei Chen Wuwen Liu Yue Liang School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China

River sand is an essential component used as a fine aggregate in mortar and *** to unrestrained exploitation,river sand resources are gradually being *** requires alternative *** study deals with the properties of cement mortar containing different levels of manufactured sand(MS)based on quartzite,used to replace river *** river sand was replaced at 20%,40%,60%and 80%with MS(by weight or volume).The mechanical properties,transfer properties,and microstructure were examined and compared to a control group to study the impact of the replacement *** results indicate that the compressive strength can be improved by increasing such a *** strength was improved by 35.1%and 45.5%over that of the control mortar at replacement levels of 60%and 80%,*** there was a weak link between porosity and gas permeability in the mortars with manufactured sand,the gas permeability decreased with growing the replacement *** microstructure of the MS mortar was denser,and the cement paste had fewer microcracks with increasing the replacement level.

关键词： Manufactured sand quartzite compressive strength gas permeability microstructure

Influence of Ultra Fine Glass Powder on the Properties and Microstructure of Mortars

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Fluid Dynamics & Materials Processing 2024年第5期20卷 915-938页

作者： Wei Chen Dingdan Liu Yue Liang School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China

This study focuses on the effect of ultrafine waste glass powder on cement strength,gas permeability and pore *** contents were considered,with particle sizes ranging from 2 to 20μ***,alkali activation was considered to ameliorate the reactivity and cementitious properties,which were assessed by using scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDS),and specific surface area pore size distribution *** to the results,without the addition of alkali activators,the performance of glass powder mortar decreases as the amount of glass powder increases,affecting various aspects such as strength and resistance to gas *** 5%glass powder mortar demonstrated a compressive strength at 60 days higher than that of the control ***,adding alkali activator(CaO)during hydration ameliorated the hydration environment,increased the alkalinity of the composite system,activated the reactivity of glass powder,and enhanced the interaction of glass powder and pozzolanic *** general,compared to ordinary cement mortar,alkali-activated glass powder mortar produces more hydration products,showcases elevated density,and exhibits improved gas ***,alkali-activated glass powder mortar demonstrates an improvement in performance across various aspects as the content *** a substitution rate of 15%,the glass powder mortar reaches its optimal levels of strength and resistance to gas permeability,with a compressive strength increase ranging from 28.4%to 34%,and a gas permeation rate reduction between 51.8%and 66.7%.

关键词： Mortar waste glass powder alkali activation compressive strength gas permeability pore structure

EFFECTS OF CHEMICAL MODIFICATIONS AND MMT NANOCLAY ADDITION ON TRANSPORT PHENOMENA OF NATURALLY WOVEN COCONUT SHEATH/POLYESTER NANOCOMPOSITES

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Chinese Journal of Polymer Science 2013年第8期31卷 1074-1086页

作者： N. Rajini J.T. Winowlin Jappes S. Rajakarunakaran C. Bennet Centre for Composite Materials Department of Mechanical Engineering Kalasalingam University Center for Advanced Materials Department of Mechanical Engineering Cape Institute of Technology Levengipuram

Studies on the behavior of molecular transport properties such as thermal conductivity, gas permeability, volume and surface resistivity have been carried out for the naturally woven coconut sheath （CS） fiber reinforced composites with the addition of nanoclay and chemical treatment of fiber. The compression molding technique was used to fabricate the coconut sheath/clay reinforced hybrid composites. The morphological studies such as X-ray diffractogram （XRD）, transmission electron microscopy （TEM） and scanning electron microscopy （SEM） have been carried out for polyester nanocomposites and coconut sheath fiber. The decreased gas permeability, thermal conductivity and volume and surface resistivity have been observed with increasing the weight percentage of nanoclay in polyester matrix. In chemical modifications, the alkali and silane treated coconut sheath reinforced composites have shown great influence on the transport properties due to the increasing hydrophilic nature by the topographical changes at the fiber surface. Dielectric strength has also been reported in this paper for all types of composites. Infra-red （IR） spectra have also been taken to study the physical and chemical structural changes of treated coconut sheath.

关键词： Nanoclay Coconut sheath gas permeability TEM SEM FTIR.