Long-term behavior of epoxy/graphene-based composites determined by dynamic mechanical analysis

2015 ◽  
Vol 50 (19) ◽  
pp. 6407-6419 ◽  
Author(s):  
Luís C. O. Silva ◽  
Glaura G. Silva ◽  
Pulickel M. Ajayan ◽  
Bluma G. Soares
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Mechanical Analysis ◽  
Dynamic Mechanical ◽  
Long Term Behavior

scholarly journals Pinpoint Loading Examinations of Poly(lactic acid) Biopolymers

2018 ◽  
Vol 11 (4) ◽  
pp. 206-217
Author(s):  
Luca Kotrocz ◽  
Péter Bakonyi
Keyword(s):  
Lactic Acid ◽  
Dynamic Mechanical Analysis ◽  
Room Temperature ◽  
Mechanical Analysis ◽  
Poly Lactic Acid ◽  
Hardness Tests ◽  
Wide Range ◽  
Short And Long Term ◽  
Long Term Behavior

We have made a new mounting unit for Dynamic Mechanical Analysis (DMA) equipment, suitable for measuring microhardness and indentation, and examined its usability on thermoplastic poly(lactic acid) (PLA) material.  We used a Vickers-type microhardness indenter, and examined the dimensions of the indented area and the loading force. This novel unit is suitable for measuring the short and long-term behavior of the material using pinpoint load not only at room temperature (20-23 °C) – like common hardness tests – but at a wide range of temperatures.

Effect of different stacking sequences on hybrid carbon/glass/epoxy composites laminate: Thermal, dynamic mechanical and long-term behavior

2019 ◽  
Vol 54 (6) ◽  
pp. 731-743 ◽  
Author(s):  
Dielly Cavalcanti da Silva Monte Vidal ◽  
Heitor L Ornaghi ◽  
Felipe Gustavo Ornaghi ◽  
Francisco Maciel Monticeli ◽  
Herman Jacobus Cornelis Voorwald ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Hybrid Composites ◽  
Fiber Composite ◽  
Mechanical Analysis ◽  
Epoxy Composites ◽  
Dynamic Mechanical ◽  
Glass Fiber Composite ◽  
Long Term Behavior ◽  
Hybrid Carbon

In the present study, different stacking sequences on hybrid carbon/glass/epoxy composites laminate were examined in relation to thermal, dynamic mechanical and long-term behavior. A positive hybrid effect was found for both hybrid composites (interleaved-Hybrid 1 and in block-Hybrid 2) showing that in some cases hybrid composites can properly replace carbon or glass composites. The composite containing all glass fiber in the middle (Hybrid 2) presented similar thermal behavior when compared to glass fiber composite. All hybrid composites presented higher storage modulus when compared to glass composite. Dynamic mechanical analysis showed that both hybrids can satisfactorily perform the requirement in a wide temperature range. The long-term prediction was successfully applied for all composites, showing to be highly temperature-dependent. Hence, depending on the application requirement, both hybrids can be used, saving weight and cost.

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.

Sign in / Sign up

Export Citation Format

Share Document