Design of toughened PLA based material for application in structures subjected to severe loading conditions. Part 2. Quasi-static tensile tests and dynamic mechanical analysis at ambient and moderately high temperature

2017 ◽  
Vol 57 ◽  
pp. 235-244 ◽  
Author(s):  
A. Bouzouita ◽  
D. Notta-Cuvier ◽  
R. Delille ◽  
F. Lauro ◽  
J.-M. Raquez ◽  
...  
Keyword(s):  
High Temperature ◽  
Dynamic Mechanical Analysis ◽  
Tensile Tests ◽  
Mechanical Analysis ◽  
Loading Conditions ◽  
Dynamic Mechanical ◽  
Static Tensile ◽  
Moderately High Temperature ◽  
Severe Loading

Dynamic Mechanical Analysis (DMA) of CMP pad materials

2000 ◽  
Vol 613 ◽  
Author(s):  
Irene Li ◽  
Kersten M. Forsthoefel ◽  
Kathleen A. Richardson ◽  
Yaw S. Obeng ◽  
William G. Easter ◽  
...  
Keyword(s):  
High Temperature ◽  
Dynamic Mechanical Analysis ◽  
Semiconductor Industry ◽  
Polymer Network ◽  
Chemical Exposure ◽  
Mechanical Analysis ◽  
Process Conditions ◽  
Temperature Transition ◽  
Basic Oxide ◽  
Dynamic Mechanical

ABSTRACTIn the semiconductor industry, there is a need to establish fundamental, mechanism-based, correlation(s) between process conditions, consumables (e.g., pads and slurries), and observed process performance in Chemical-Mechanical Polishing (CMP). In this paper, we present recent results of studies on polyurethane-based CMP pads in static and dynamic conditions using Dynamic Mechanical Analysis (DMA) to monitor modulus and energy damping changes. Two-layered, composite IC1000 on Suba IV pads, [IC1000 (cast and cured polyurethane elastomer) / Suba IV (polyurethane impregnated polyester felt)], were analyzed: prior to use (fresh); after a 24-hr soak in silica-containing oxide slurry (basic); and after oxide polishing (used). Upon comparison it was observed that a characteristic transition feature due to water is present at sub-ambient temperatures in both the slurry soaked and used pads. Exposure of as-received pads to basic oxide slurry results in a broad, high temperature transition thought to be the result of chemical-induced disruption of macrostructural units. Polishing (load-enhanced chemical exposure) introduces further changes to the polymer network represented by an apparent degradation to the structural species responsible for the high temperature transition in Suba IV.

scholarly journals Thermal Properties and Structural Features of Multilayer Films Based on Chitosan and Anionic Polysaccharides

Biomolecules ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 762
Author(s):  
Galina N. Gubanova ◽  
Valentina A. Petrova ◽  
Svetlana V. Kononova ◽  
Elena N. Popova ◽  
Valentina E. Smirnova ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Glass Transition ◽  
Thermal Properties ◽  
High Temperature ◽  
Dynamic Mechanical Analysis ◽  
Mechanical Analysis ◽  
Temperature Peak ◽  
High Temperature Peak ◽  
Dynamic Mechanical ◽  
Multilayer Composites

This study investigates the thermal and structural properties of multilayer composites based on chitosan (CS) and polyanions with different functionalities, including sodium sulfoethyl cellulose (SEC), sodium alginate (ALG), and sodium hyaluronate (HA). Unlike polyelectrolyte complexes (PECs) obtained by polymer mixing, the formation of a PEC layer by a process of layer-by-layer deposition of oppositely charged polymers is accompanied by the transformation of the CS polymorphic state, and this affects the relaxation and thermal properties of the resulting multilayer composite. X-ray diffraction analysis showed that the formation of the PEC layer in the CS/SEC multilayer film is accompanied by crystallization of the CS chains and the formation of a predominantly anhydrous CS modification. Thermogravimetric analysis of the CS/SEC film registers a high-temperature peak associated with the thermal decomposition of crystalline CS in the PEC composition. According to the dynamic mechanical analysis, the CS/SEC composite was characterized by a single glass transition temperature, indicating a strong interaction between the layers when using SEC (a strong acid salt) as the counterion to CS. For multilayer composites with weak polyacid salts (ALG and HA), the crystallization of CS in the PEC layer is weaker, as reflected in the thermal degradation of these films. A high-temperature peak is recorded in the thermal decomposition of CS/HA and is absent in the case of CS/ALG. Dynamic mechanical analysis of the CS/ALG composite showed two glass transition temperatures close to those of the original polymers, indicating weak PEC formation. The CS/HA composite showed an intermediate response. Thus, the effect of the PEC layer on the properties of the poly-layer composites decreases in the order CS/SEC > CS/HA > CS/ALG.

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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