Title page for ETD etd-6998-172444

Type of Document Master's Thesis
Author Ghosh, Indrajit
Author's Email Address ighosh@vt.edu
URN etd-6998-172444
Title Blends of Biodegradable Thermoplastics With Lignin Esters
Degree Master of Science
Department Wood Science and Forest Products
Advisory Committee
Advisor Name Title
Glasser, Wolfgang G. Committee Chair
Davis, Richey M. Committee Member
Frazier, Charles E. Committee Member
  • starch
  • polycaprolactone
  • cellulose
  • ester
  • compatibility lignin
  • miscibility
  • blend
  • polymer
  • Biodegradable
  • polyhydroxybutyrate
  • cellulose acetate butyrate
Date of Defense 1998-04-22
Availability unrestricted
Thermoplastic 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.
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  CHAPTERI1.PDF 64.40 Kb 00:00:17 00:00:09 00:00:08 00:00:04 < 00:00:01
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