Properties of ternary blends of starch and maleated polymers of styrene and ethylene propylene rubber

Zhihong Yang, Mrinal Bhattacharya, Utpal R. Vaidya

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

The properties of starch/styrene maleic anhydride (SMA)/ethylene propylene maleic anhydride (EPMA) were studied at a constant starch composition of 60% by weight. The synthetic polymer content was 40% of total weight and contained 30, 20 and 10% SMA by weight, the rest being EPMA. Blends were made in a batch mixer as well as continuously in an extruder. The water absorption data showed that samples made by extrusion have less water resistance than samples made in a batch mixer. Dynamic mechanical analysis indicated three distinct glass transitions, corresponding to the glass transitions of EPMA, starch and SMA. Tests showed injection moulding gave higher tensile strength compared to compression moulding, and tensile strength increased with SMA content. Gel permeation chromatography data indicated there was degradation during mixing. Blending using an extruder caused more degradation of starch in the blends than when a batch mixer was used. Both scanning electron microscopy and optical microscopy showed that some starch was not melted during blending though the number and average size of unmelted starch granules decreased with decreasing SMA content. Scanning electron microscopy indicated the different morphologies of injection moulded samples at different locations in the mould.

Original languageEnglish (US)
Pages (from-to)2137-2150
Number of pages14
JournalPolymer
Volume37
Issue number11
DOIs
StatePublished - May 1996

Keywords

  • Maleated polymers
  • Starch
  • Ternary blends

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