title: Relationship between morphologies and mechanical properties of hydroxypropyl methylcellulose/hydroxypropyl starch blends.
abstract: 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.
authors: Centre for Polymer from Renewable Resources, SFSE, SCUT, Guangzhou, China; CSIRO, Manufacturing Flagship, Melbourne, Vic 3168, Australia.
authors: Yanfei
authors: Y
authors: Wang
authors: Centre for Polymer from Renewable Resources, SFSE, SCUT, Guangzhou, China; Department of Materials Science and Engineering and New Horizons Research Centre, Monash University, Clayton, Australia; CSIRO, Manufacturing Flagship, Melbourne, Vic 3168, Australia; School of Food Science and Engineering, Yangzhou University, Yangzhou, China.
authors: Liang
authors: L
authors: Zhang
authors: Centre for Polymer from Renewable Resources, SFSE, SCUT, Guangzhou, China. Electronic address: liuhongsheng@scut.edu.cn.
authors: Hongsheng
authors: H
authors: Liu
authors: Centre for Polymer from Renewable Resources, SFSE, SCUT, Guangzhou, China; Department of Materials Science and Engineering and New Horizons Research Centre, Monash University, Clayton, Australia. Electronic address: felyu@scut.edu.cn.
authors: Long
authors: L
authors: Yu
authors: Department of Materials Science and Engineering and New Horizons Research Centre, Monash University, Clayton, Australia.
authors: George P
authors: GP
authors: Simon
authors: CSIRO, Manufacturing Flagship, Melbourne, Vic 3168, Australia.
authors: Nuozi
authors: N
authors: Zhang
authors: Centre for Polymer from Renewable Resources, SFSE, SCUT, Guangzhou, China.
authors: Ling
authors: L
authors: Chen
mesh_terms: D063566:Biodegradable Plastics / Q000737:chemistry*; D002214:Capsules / Q000737:chemistry*; D065347:Hypromellose Derivatives / Q000737:chemistry*; D007455:Iodine / Q000737:chemistry; D044367:Phase Transition; D033081:Shear Strength; D012995:Solubility; D012996:Solutions; D013213:Starch / Q000031:analogs & derivatives* / Q000737:chemistry; D013696:Temperature; D013718:Tensile Strength; D014783:Viscosity
chemical_list: D063566:Biodegradable Plastics; D002214:Capsules; D012996:Solutions; D065347:Hypromellose Derivatives; D013213:Starch; C046042:2-hydroxypropyl starch; D007455:Iodine
keywords: Blend; Edible film; HPMC; HPS; Morphology; Phase transition