Improving the Flowability of Poly(3-hydroxybutyrate- co-3-hydroxyhexanoate) by Blending Techniques

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The study investigated how blending poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) with poly(ε-caprolactone) (PCL) or triethyl citrate changes rheological behavior, using theoretical predictions alongside oscillatory and steady-state shear measurements. Triethyl citrate was miscible with PHBHHx and acted as a plasticizer, with a clear decrease in shear viscosity in the low-shear-rate region, while PCL was immiscible and produced phase-separated blends that strongly reduced steady-state shear viscosity across a wide shear-rate range and increased PHBHHx crystallization rate. The decreases in oscillatory shear moduli in the linear viscoelastic region were limited, and the work notes an industry-oriented caveat that PHBHHx molecular weight needs to be high to satisfy solid-state mechanical property requirements. This paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Improving the Flowability of Poly(3-hydroxybutyrate- co-3-hydroxyhexanoate) by Blending Techniques | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Improving the Flowability of Poly(3-hydroxybutyrate- co-3-hydroxyhexanoate) by Blending Techniques Nantinee Tassakarn, Masayuki Yamaguchi, Takenobu Sunagawa This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7736613/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 6 You are reading this latest preprint version Abstract In this study, the rheological properties of poly(3-hydroxybutyrate- co -3-hydroxyhexanoate) (PHBHHx) were modified by the addition of poly(ε-caprolactone) (PCL) or triethyl citrate. Triethyl citrate was found to be miscible with PHBHHx and act as a plasticizer. As theoretically predicted, the shear viscosity of plasticized PHBHHx clearly decreased in the low shear rate region. In contrast, PCL was immiscible with PHBHHx, and the PHBHHx/PCL blends showed the phase-separated structure. Although the decreases in the oscillatory shear moduli in the linear viscoelastic region were limited, the steady-state shear viscosity greatly decreased by the addition of PCL in a wide range of the shear rate. Furthermore, the addition of PCL also enhanced the crystallization rate of PHBHHx. This technique will be attractive in industry because the molecular weight of PHBHHx should be high to meet the requirements of the mechanical properties in the solid state. poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) poly(ε-caprolactone) triethyl citrate shear viscosity Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Reviews received at journal 13 Nov, 2025 Reviewers agreed at journal 30 Oct, 2025 Reviewers invited by journal 28 Oct, 2025 Editor assigned by journal 07 Oct, 2025 Submission checks completed at journal 07 Oct, 2025 First submitted to journal 28 Sep, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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Techniques","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":true,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"colloid-and-polymer-science","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"","sideBox":" Learn more about [Colloid and Polymer Science](https://www.springer.com/journal/396) ","snPcode":"396","submissionUrl":"https://mc.manuscriptcentral.com/cps","title":"Colloid and Polymer Science","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false},"keywords":"poly(3-hydroxybutyrate-co-3-hydroxyhexanoate), poly(ε-caprolactone), triethyl citrate, shear viscosity","lastPublishedDoi":"10.21203/rs.3.rs-7736613/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-7736613/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eIn this study, the rheological properties of poly(3-hydroxybutyrate-\u003cem\u003eco\u003c/em\u003e-3-hydroxyhexanoate) (PHBHHx) were modified by the addition of poly(ε-caprolactone) (PCL) or triethyl citrate. Triethyl citrate was found to be miscible with PHBHHx and act as a plasticizer. As theoretically predicted, the shear viscosity of plasticized PHBHHx clearly decreased in the low shear rate region. In contrast, PCL was immiscible with PHBHHx, and the PHBHHx/PCL blends showed the phase-separated structure. Although the decreases in the oscillatory shear moduli in the linear viscoelastic region were limited, the steady-state shear viscosity greatly decreased by the addition of PCL in a wide range of the shear rate. Furthermore, the addition of PCL also enhanced the crystallization rate of PHBHHx. This technique will be attractive in industry because the molecular weight of PHBHHx should be high to meet the requirements of the mechanical properties in the solid state.\u003c/p\u003e\u003cp\u003e\u003c/p\u003e","manuscriptTitle":"Improving the Flowability of Poly(3-hydroxybutyrate- co-3-hydroxyhexanoate) by Blending Techniques","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-11-07 15:03:15","doi":"10.21203/rs.3.rs-7736613/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"editorInvitedReview","content":"","date":"2025-11-13T18:48:30+00:00","index":"hide","fulltext":""},{"type":"reviewerAgreed","content":"329838723992522310623966518098931777263","date":"2025-10-30T14:39:43+00:00","index":"hide","fulltext":""},{"type":"reviewersInvited","content":"","date":"2025-10-28T14:37:16+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2025-10-07T06:11:26+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2025-10-07T06:10:03+00:00","index":"","fulltext":""},{"type":"submitted","content":"Colloid and Polymer Science","date":"2025-09-28T22:34:30+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"colloid-and-polymer-science","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"","sideBox":" Learn more about [Colloid and Polymer Science](https://www.springer.com/journal/396) ","snPcode":"396","submissionUrl":"https://mc.manuscriptcentral.com/cps","title":"Colloid and Polymer Science","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"stoa","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false}}],"origin":"","ownerIdentity":"efc2c2e6-8f0e-48d6-bb00-4e01f71fb87b","owner":[],"postedDate":"November 7th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"under-review","subjectAreas":[],"tags":[],"updatedAt":"2025-11-18T12:38:51+00:00","versionOfRecord":[],"versionCreatedAt":"2025-11-07 15:03:15","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-7736613","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-7736613","identity":"rs-7736613","version":["v1"]},"buildId":"8U1c8b4HqxoKbykW_rLl7","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}

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