[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-321701-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-321701-en":131},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","rheological-aspects-of-effective-processing-of-terephthalic-acid-in-the-synthesis-of-polyethylene-terephthalate","RHEOLOGICAL ASPECTS OF EFFECTIVE PROCESSING OF TEREPHTHALIC ACID IN THE SYNTHESIS OF POLYETHYLENE TEREPHTHALATE","","Study of rheological behavior in the initial phase of PET (polyethylene terephthalate) production when terephthalic acid (TPA) is used as raw material. The work analyzes how concentration, dispersivity, and particle shape/size of TPA affect the structure-mechanical properties of TPA suspensions in glycol and the resulting esterification products. Temperature and molar ratio changes are evaluated for process intensification considering thixotropic limits. Selected parameters are derived from the experimental findings, including recovery and flow behavior.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/research-report/","Research & Report",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/rheological-aspects-of-effective-processing-of-terephthalic-acid-in-the-synthesis-of-polyethylene-terephthalate/321701/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/rheological-aspects-of-effective-processing-of-terephthalic-acid-in-the-synthesis-of-polyethylene-terephthalate/321701.png","ImageObject",300,407,{"name":42,"@type":43},"Emma Wilson","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-09","2026-09-21",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",11,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"Why must rheological properties be considered at the initial stage of PET synthesis with TPA as raw material?","Question",{"text":63,"@type":64},"Because mixing TPA with ethylene glycol forms a two-phase heterogeneous system whose physical heterogeneity persists up to high TPA conversion levels. Therefore, the reaction system’s rheology must be accounted for even before later polycondensation stages.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What factors are investigated for TPA suspensions in ethylene glycol?",{"text":68,"@type":64},"The study examines concentration, dispersivity (particle size distribution), and the shape of TPA particles across different temperatures, using these variables to understand rheological properties.",{"name":70,"@type":61,"acceptedAnswer":71},"How do thixotropic effects and recovery behavior manifest in the suspensions?",{"text":72,"@type":64},"After deformation cycles with rest periods, the structure partially restores through thixotropic recovery. The degree of restoration depends on the recovery period, and the thixotropic properties relate to the smallest TPA particles restoring contacts destroyed by deformation.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},321701,1790257860,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,106,111,115,120,123,127],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":25,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":102,"doc_module":4,"doc_module_name":25,"category_name":103,"show_sort_weight":104,"slug":105},6,"Technology",50,"technology",{"id":107,"doc_module":4,"doc_module_name":25,"category_name":108,"show_sort_weight":109,"slug":110},7,"Healthcare",40,"healthcare",{"id":112,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":113,"slug":114},8,30,"research-report",{"id":116,"doc_module":4,"doc_module_name":25,"category_name":117,"show_sort_weight":118,"slug":119},9,"Religion & Spirituality",20,"religion-spirituality",{"id":118,"doc_module":4,"doc_module_name":25,"category_name":121,"show_sort_weight":118,"slug":122},"World Cup","world-cup",{"id":124,"doc_module":4,"doc_module_name":25,"category_name":125,"show_sort_weight":124,"slug":126},10,"Lifestyle","lifestyle",{"id":128,"doc_module":4,"doc_module_name":25,"category_name":129,"show_sort_weight":97,"slug":130},19,"General","general",{"code":4,"msg":82,"data":132},{"doc_id":79,"user_id":133,"nickname":42,"user_avatar":134,"doc_module":4,"category_id":112,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":140,"language":141,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":142,"faqs":143,"seo_title":144,"seo_description":12,"update_tm":145,"read_time":146,"preview_page_count":4},3848291630094,"https://eur-avatar.wpscdn.com/davatar_085a072bc5b1113ac321206ff7593b45","B  \nMitcenko,L.N.,and Kremer,E.B.  \nRheological aspects of effective processing ofterephthalic acid in the synthesis of polyethyleneterephthalate.4Q  \nFaserforschung und Textiltechnik 28,no.4:143-146(1977).  \nFiled:  TRANSLATION NO.4468FSTxA7  \nL.N.Mitcenko and E.B.Kremer*:  Rheological Aspects of EffectiveProcessing of Terephthalic Acid in the Synthesis of Polyethy-lene Terephthalate [Rheologische Aspekte einer intensiverenVerarbeitung der Terephthalsäure bei der Synthese von Poly-äthylenterephthalat].  \nFaserforschung und Textiltechnik Vol.28,No.4(1977)pp.143-146.  \n*Associated Research Institute for Synthetic Fibers,Kalinin,USSR  \nReceived on September 7,1976  \n\n| Translated from German by the Ralph McElroy Co.,  \u003Cbr>USA  \u003Cbr>2102 Rio Grande,Austin,Texas 78705   |  | Custom    | Division   |\n| --- | --- | --- | --- |\n\nDigitized by the Internet Archivein 2019  \nhttps://archive.org/details/rheologicalaspec00mitc  \n# RHEOLOGICAL ASPECTS OF EFFECTIVE PROCESSING OF TEREPHTHALICACID IN THE SYNTHESIS OF POLYETHYLENE TEREPHTHALATE\n\nThe physical heterogeneity of the reaction systen in the initial phase of the technological process,i.e.nixing ofterephthalic acid with ethylene glycol,requires investigations of the strueture-mechanical properties of TPA suspensionsin the glycol and the esterification products.The results obtained by investigating the efiect of concentration,dispersity and shape of TPA particles on the rheological properties of the suspensions are described and discussed.The possi-bilities of intensifying the process by changing the teperature and inole ratio are demonstrated within the linits setby the thixotropic character of the suspensions.The results are used to select technological paraneters.  \n## 1.  Introduction\n\nIn traditional technology,a knowledge of rheological char-acteristics is necessary for the production of polyethylene tere-phthalate(PETP)on a base of DMT only for the last stages cf theprocess(polycondensation and processing the polymer),but whenterephthalic acid(TPA)is used as the raw material,the rheologicalproperties of the reaction system must be taken into account evenfor the initial stages.  This is because the two reaction partici-pants TPA and ethylene glycol(EG)in mixture with each other forma two-phase heterogeneous system whose physical heterogeneity isretained up to high TPA conversion levels.  \nIn order to be able to select the technological parameterswell and to optimize the process,we have investigated the rheo-logical properties of disperse systems,namely TPA suspensions inEG and the esterification products as a function of concentration,dispersivity and the shape of the TPA particles at various temper-atures.  \n## 2.  Experimental section\n\nThe concentrated suspensions(65 to 70 wt %)were preparedfrom TPA and EG in molar ratios of 1:1.5 and 1:1.2.Three typesof TPA were used,differing with respect to the particle sizes(\u003C50 μm,\u003C100 μm,\u003C250 μm).  The rheological investigationswere carried out according.to the constant deformation rate methodwith the help of a\"Rheotest-2\"rotating viscosimeter [1].  \nPage 2  \n## 3.  Findings and discussion\n\nAs Figure l shows,the shearing strain as a function of thelogarithm of deformation shows an almost monotonic dependence atlow deformation rates.  At increasing deformation rates for thesuspension,there is a peak in the curves which increases in height.It is known [2]that such a peak in plastic disperse systems indi-cates that the shearing strength limit has been exceeded.  It isassociated with extensive destruction of the three-dimensional  \nstructure formed by the particles of the solid phase.  This destruc-tion is completed in the descending branches of the curves.  \nWhen there are three successive deformations of the suspensionwith various periods of time between the deformation cycles(recovery),it is found that thixotropic recovery of the structure occurs whenthe suspension is allowed to rest,such that the degree of thisrestoration is proportional to ","cbCaiehl3aG4EIX9","https://ap.wps.com/l/cbCaiehl3aG4EIX9","pdf",1386045,32,"English","# Introduction\n# Experimental section\n# Findings and discussion","[{\"question\":\"Why must rheological properties be considered at the initial stage of PET synthesis with TPA as raw material?\",\"answer\":\"Because mixing TPA with ethylene glycol forms a two-phase heterogeneous system whose physical heterogeneity persists up to high TPA conversion levels. Therefore, the reaction system’s rheology must be accounted for even before later polycondensation stages.\"},{\"question\":\"What factors are investigated for TPA suspensions in ethylene glycol?\",\"answer\":\"The study examines concentration, dispersivity (particle size distribution), and the shape of TPA particles across different temperatures, using these variables to understand rheological properties.\"},{\"question\":\"How do thixotropic effects and recovery behavior manifest in the suspensions?\",\"answer\":\"After deformation cycles with rest periods, the structure partially restores through thixotropic recovery. The degree of restoration depends on the recovery period, and the thixotropic properties relate to the smallest TPA particles restoring contacts destroyed by deformation.\"}]","RHEOLOGICAL ASPECTS OF EFFECTIVE PROCESSING OF TEREPHTHALIC ACID IN THE SYNTHESIS OF POLYETHYLENE TEREPHTHALATE | PDF",1789960026,81]