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|標題:||Effects of die shapes and additives on the physical and mechanical properties, and cellular structure of biodegradable cushioning extruded foams||作者:||Lui, W.B.
|關鍵字:||die shapes;additives;cellular structure;biodegradable;cushioning;extruded foams;brittle starch foams;amylose content||Project:||Journal of Cellular Plastics||期刊/報告no：:||Journal of Cellular Plastics, Volume 41, Issue 5, Page(s) 437-455.||摘要:||
Efforts are focused on the effects of operating parameters, i.e., die shapes (DS), PVA ratio (PR), and additives (AT), on the physical and mechanical properties of corn-PVA extrudates in this study. The cellular structure of biodegradable extruded foams are studied and the extrudates are evaluated as cushioning materials. The process variables are the operating conditions, DS (O, infinity, Delta, and 0), PR (40, 50, 60%), and AT (8%) (sodium bicarbonate (NaHCO3), calcium carbonate (CaCO3), calcium hydroxide (Ca(OH)(2))). The experimental setup is a 4 x 3 x 3 factorial design. Samples of each treatment are collected and the physical and mechanical properties are measured and analyzed using the PROC ANOVA and PROC CORR of the SAS 6.0 software package. Moreover, the cellular structures of the extrudates are observed by using a scanning electron microscope. The experimental results indicate that: (a) the change of DS has a significant effect on the longitudinal expansion, bulk density, and compressibility of the extrudates; (b) the change of PR has a significant effect on the longitudinal expansion, bulk density, and compressibility of the extrudates; (c) the change of AT has a significant effect on the longitudinal expansion, bulk density, and compressibility of the extrudates; (d) the most uniform cell is obtained with the O-shaped die, as compared with other die shapes. A moderate cell wall is obtained with the O-shaped die. The largest cell sizes are found in PVA 60% with CaCO3. However, the smallest cell sizes are found in PVA 60% with NaHCO3. Changing the types of additives from NaHCO3 to CaCO3, and CaCO3 to Ca(OH)(2) increases the cell size and cell wall thickness.
|Appears in Collections:||生物產業機電工程學系|
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