Relationship between morphologies and mechanical properties of hydroxypropyl methylcellulose/hydroxypropyl starch blends

Yanfei Wang, Liang Zhang, Hongsheng Liu, Long Yu, George P. Simon, Nuozi Zhang, Ling Chen

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)


Edible films from the blending hydroxypropyl methylcellulose (HPMC) with hydroxypropyl starch (HPS) have been developed. This work focuses on the relationship between morphologies and mechanical properties of such systems. To aid understanding of blend morphology, a new technique used to identify the two phases through dying of the HPS by iodine has been developed, which provided a simple and convenient way to clearly distinguish between HPMC and HPS phases. It was found that the blend system is immiscible and there is phase transition point depending on blending ratio and solution concentration. The lower transparency point of the blend and phase transition reign of HPMC from continuous phase to separated phase correspond with the variation of tensile modulus. The modulus and elongation decreased with increased solution concentration, which is correlatable with the morphologies present, where it was found that the HPMC gradually changed from a continuous phase to a distinct phase.

Original languageEnglish
Pages (from-to)329-335
Number of pages7
JournalCarbohydrate Polymers
Publication statusPublished - 20 Nov 2016


  • Blend
  • Edible film
  • HPMC
  • HPS
  • Morphology
  • Phase transition

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