Blends of Biodegradable Thermoplastics With Lignin Esters

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dc.contributor.authorGhosh, Indrajiten
dc.contributor.committeechairGlasser, Wolfgang G.en
dc.contributor.committeememberFrazier, Charles E.en
dc.contributor.committeememberDavis, Richey M.en
dc.contributor.departmentWood Science and Forest Productsen
dc.date.accessioned2014-03-14T20:52:07Zen
dc.date.adate1998-07-09en
dc.date.available2014-03-14T20:52:07Zen
dc.date.issued1998-04-22en
dc.date.rdate1998-07-09en
dc.date.sdate1998-04-22en
dc.description.abstractThermoplastic blends of several biodegradable polymers with lignin (L) and lignin esters were prepared by solvent casting and melt processing. Among the biodegradable thermoplastics were cellulose acetate butyrate (CAB), poly-hydroxybutyrate (PHB), poly-hydroxybutyrate-co-valerate (PHBV), and a starch-caprolactone blend (SCL). Lignin esters included acetate (LA), butyrate (LB), hexanoate (LH), and laurate (LL). Blend characteristics were analyzed in terms of thermal and mechanical properties. The results indicate widely different levels of interaction between two polymer constituents. Melt blended samples of CAB/LA and CAB/LB were compatible on a 15-30 nm scale when probed by dynamic mechanical thermal analysis, and the glass transition temperatures of the blends followed Fox equation, whereas those of CAB/LH and CAB/LL showed distinct broad transitions on the same scale. Melt blending produced well dispersed phases whereas large phase separation evolved out of solvent castings. Crystallinity and melting points of PHB and PHBV were affected by the incorporation of lignin component, revealing some interaction between the blend constituents. Blends of SCL with L and LB revealed significant effect on crystallinity and melting temperatures of poly-caprolactone component, revealing polymer-polymer interaction between SCL and lignin components. An increased degree of crystallinity was observed in the case of higher-Tg L compared to lower Tg LB. Improvememt in modulus (and in some cases strength also) was observed in almost all blends types due to the glassy reinforcing behavior of lignin.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-6998-172444en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-6998-172444/en
dc.identifier.urihttp://hdl.handle.net/10919/36890en
dc.publisherVirginia Techen
dc.relation.haspartCHAPTERI1.PDFen
dc.relation.haspartCHAPTERII1.PDFen
dc.relation.haspartCHAPTERIII1.PDFen
dc.relation.haspartCHAPTERIV1.PDFen
dc.relation.haspartCHAPTERV1.PDFen
dc.relation.haspartCONTENT2.PDFen
dc.relation.haspartVITA3.PDFen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectstarchen
dc.subjectpolycaprolactoneen
dc.subjectcelluloseen
dc.subjectesteren
dc.subjectcompatibility ligninen
dc.subjectmiscibilityen
dc.subjectblenden
dc.subjectpolymeren
dc.subjectBiodegradableen
dc.subjectpolyhydroxybutyrateen
dc.subjectcellulose acetate butyrateen
dc.titleBlends of Biodegradable Thermoplastics With Lignin Estersen
dc.typeThesisen
thesis.degree.disciplineWood Science and Forest Productsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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