Search Result of "Chawalit Petnamsin"

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ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effect of Particle Size on Physical Properties and Biodegradability of Cassava Starch / Polymer Blend)

ผู้เขียน:ImgChawalit Petnamsin, Imgนิติ เติมเวชศยานนท์, Imgดร.กล้าณรงค์ ศรีรอต, รองศาสตราจารย์



Blending starch with a biodegradable polymer is one method to produce a bioplastic. Due to the high cost of biopolymers, techniques have been developed to enable a high concentration of starch in the blend. The study was conducted in order to determine the effect of particle size (9 to 15 ?m) of cassava starch on the physical and biodegradable properties of polycaprolactone (PCL)/cassava starch blend. It was found that particles of cassava starch, after ball milling (0, 60, 90 and 120 minutes), lost their crystallinity as observed by DSC and birefringency. With less crystallinity, particles observed by SEM. easily formed clumps during the blending process. The tensile strength and %elongation decreased from 12.21 MPa and 302.89 of PCL/native starch to 4.48 MPa and 25.63 for the 120 minutes ball milled starch/PCL blend (15 : 85 w/w). Addition of glycerol (25%w/w) into the blend could support only %elongation but not tensile strength. Excellent susceptibility to ?-amylase and glucoamylase hydrolysis were evident when small particles were incorporated in the blend, compared to native starch. Blends with 60, 90, 120 minutes ball milled (both with and without addition of glycerol) showed very high biodegradability as determined by total organic carbon (TOC) released after subject to amylase digestion.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 034, Issue 2, Apr 00 - Jun 00, Page 254 - 261 |  PDF |  Page