Dynamic mechanical analysis of recycled polystyrene composites reinforced with wood flour

2011 ◽  
Vol 125 (2) ◽  
pp. 935-942 ◽  
Author(s):  
Matheus Poletto ◽  
Mara Zeni ◽  
Ademir J. Zattera
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Wood Flour ◽  
Mechanical Analysis ◽  
Dynamic Mechanical

Material pocket dynamic mechanical analysis: a novel tool to study thermal transition in wood fibers plasticized by an ionic liquid (IL)

Holzforschung ◽  
2015 ◽  
Vol 69 (2) ◽  
pp. 223-232 ◽  
Author(s):  
Rongxian Ou ◽  
Yanjun Xie ◽  
Qingwen Wang ◽  
Shujuan Sui ◽  
Michael P. Wolcott
Keyword(s):  
Phase Transition ◽  
Ionic Liquid ◽  
Dynamic Mechanical Analysis ◽  
Wood Flour ◽  
Mechanical Analysis ◽  
Crystalline Cellulose ◽  
Measured Temperature ◽  
Wood Fibers ◽  
Dynamic Mechanical ◽  
Wood Particles

Abstract The investigation of phase transition in powdered materials by dynamic mechanical analysis (DMA) is not straightforward because powders are difficult to prepare in a solid compact form without altering their structure and properties. In this study, a material pocket (MP) method has been applied to provide physical support to powdered samples for DMA testing (MP-DMA). Poplar wood strips and four types of wood particles [native wood flour (WF), α-cellulose (αC), holocellulose (HC), and particles without hemicelluloses (HR)] were treated with an ionic liquid (IL), 1-ethyl-3-methylimidazolium chloride ([Emim]Cl), to a weight percent gain (WPG) of 36%. Results show that all four [Emim]Cl-treated wood particles exhibited three apparent transition peaks over the measured temperature range. Paracrystalline cellulose, hemicelluloses, and lignin all exhibited a glass transition temperature (Tg) at approximately 85°C due to the plasticizing effect of [Emim]Cl. The transition peak at a higher temperature may be due to the melting of crystalline cellulose in [Emim]Cl. MP-DMA is an effective tool for direct monitoring the phase transition of powdered lignocellulosics. This provides new insight into the interactions of ILs and cell wall polymers, and the method established can be easily extended to other systems based on powdered samples.

Dynamic-mechanical analysis and SEM morphology of wood flour/polypropylene composites

2006 ◽  
Vol 17 (4) ◽  
pp. 315-318 ◽  
Author(s):  
Chui-gen Guo ◽  
Yong-ming Song ◽  
Qing-wen Wang ◽  
Chang-sheng Shen
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Wood Flour ◽  
Mechanical Analysis ◽  
Polypropylene Composites ◽  
Dynamic Mechanical ◽  
Sem Morphology

A Study on the Blends of Epoxy/Polybutadiene and the Application to the Encapsulation of a Capacitor

1992 ◽  
Vol 274 ◽  
Author(s):  
Zhongyuan Ren ◽  
Liying Qui
Keyword(s):  
Phase Separation ◽  
Dynamic Mechanical Analysis ◽  
Low Temperatures ◽  
Epoxy Resins ◽  
Mechanical Analysis ◽  
Dynamic Mechanical

ABSTRACTThis paper describes the blends of epoxy/polybutadiene and the application of the blends to the encapsulation of capacitors. Experiments showed that the hydroxy-carboxyl terminated polybutadiene (HCTPB) had a good toughening effect on epoxy resins, and the blends of epoxy/HTPB or epoxy/HCTPB had good craze resistance at low temperatures. The phase separation and dynamic mechanical analysis of these blends are discussed below.

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