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Open AccessArticle

Study of Reactive Melt Processing Behavior of Externally Plasticized Cellulose Acetate in Presence of Isocyanate

1
Fraunhofer Institute for Environmental, Safety, and Energy Technology (UMSICHT), Osterfelder Straße 3, 46047 Oberhausen, Germany
2
Center of Engineering Sciences, Polymer Technology, Martin Luther University Halle-Wittenberg, 06099 Halle, Germany
*
Author to whom correspondence should be addressed.
Materials 2014, 7(12), 7752-7769; https://doi.org/10.3390/ma7127752
Received: 31 July 2014 / Revised: 14 November 2014 / Accepted: 26 November 2014 / Published: 4 December 2014
(This article belongs to the Special Issue Advances in Cellulosic Materials 2014)
Two types of externally plasticized cellulose acetate (CA) were chemically modified using 4,4'-methylene diphenyl diisocyanate (MDI) as crosslinking agent. Crosslinking was performed in the molten state by means of melt mixing in an internal mixer. The viscoelastic properties of the non-crosslinked, externally plasticized CA show typical temperature dependence, similar to conventional thermoplastics. A strong increase in storage modulus is observed with increasing crosslink density indicating that the crosslinked compounds exhibit predominately elastic response. The complex viscosity also increases considerably with increasing crosslink density and does not reach the typical Newtonian plateau at low radial frequencies any more. The viscoelastic properties correlate well with the data recorded online during reactive melt processing in the internal mixer. In comparison to the non-crosslinked CA, the crosslinked compounds show higher glass transition temperature, higher VICAT softening temperatures, improved thermal stability and lower plasticizer evaporation at evaluated temperatures. View Full-Text
Keywords: reactive melt processing; crosslinking; cellulose acetate; plasticizer; rheology; thermal properties reactive melt processing; crosslinking; cellulose acetate; plasticizer; rheology; thermal properties
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MDPI and ACS Style

Erdmann, R.; Kabasci, S.; Kurek, J.; Zepnik, S. Study of Reactive Melt Processing Behavior of Externally Plasticized Cellulose Acetate in Presence of Isocyanate. Materials 2014, 7, 7752-7769.

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