Accelerated aging of nylon 66 and Kevlar 29 in elevated temperature, elevated humidity, smog, and ozone

1982 ◽  
Vol 21 (2) ◽  
pp. 158-163 ◽  
Author(s):  
Judith W. Mead ◽  
Keith E. Mead ◽  
Irving Auerbach ◽  
Richard H. Ericksen
Keyword(s):  
Elevated Temperature ◽  
Accelerated Aging ◽  
Nylon 66

Accelerated Aging Cycle of Composite Reinforced High Density Polyethylene (HDPE) Roofing Panel

2015 ◽  
Vol 799-800 ◽  
pp. 192-195
Author(s):  
Mansur Ahmad ◽  
Nurul Atiqah Mohd Ayob ◽  
Nurul Nadia Mohd Khairuddin
Keyword(s):  
Water Vapor ◽  
Elevated Temperature ◽  
Water Absorption ◽  
High Density Polyethylene ◽  
Accelerated Aging ◽  
High Density

The purpose of this study is to investigate the effect of accelerated aging cycle (AAC) on water absorption of the composites. The HDPE composite was subjected to a series of six ageing cycles at an elevated temperature. The cycle consist of immersion in water at (49 ± 2°C), explosion to steam and water vapor (93 ± 2°C), stored in freezer (-12 ± 2°C), and heated in oven (99 ± 2°C). It took approximately twelve days to complete this aging cycle. The effect and the changes of water absorption for both control and after accelerated aging were observed and determined. The results showed that water absorption was significant as the greater the fibre percentage, the higher the water absorption. This behavior occurs for both conditions. There were significant differences in the percentage of the water absorption for both control and accelerated aging cycle.

The Oxidation Products of Rubber

1939 ◽  
Vol 12 (2) ◽  
pp. 225-234
Author(s):  
A. van Rossem ◽  
P. Dekker
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperature ◽  
Tensile Properties ◽  
High Speed ◽  
Accelerated Aging ◽  
Direct Determination ◽  
Oxidation Products ◽  
Vulcanized Rubber

Abstract In their summary of the aging of vulcanized rubber, Porritt and Scott state that three factors are responsible for the changes in mechanical properties of vulcanized rubber during aging, viz.: (a) oxidation of the rubber; (b) after-vulcanization; (c) some colloidal change of the rubber, sometimes termed aggregation. Of these factors, oxidation is by far the most important because it is responsible for the decrease in mechanical properties, which leads to the general deterioration of rubber from a technical standpoint. It was Marzetti who proved that the decrease of mechanical properties in accelerated aging is due to oxidation. Later, Kohman confirmed this in a more concise way and showed that even such small amounts as 0.5% of oxygen absorbed by vulcanized rubber are sufficient to decrease tensile properties to 50% of their original value. When studying aging, three ways of tackling this problem are possible, viz.: (1) Investigations of the mechanical properties, either under normal conditions, or under special conditions such as elevated temperature or high speed. (2) Determination of oxidation products, which are formed during oxidation of the rubber. (3) Direct determination of the amount of oxygen which is absorbed by the rubber. It is clear that any of these methods may be combined with accelerated aging tests.

The effect of elevated temperature on the accelerated aging of LiCoO2/mesocarbon microbeads batteries

2016 ◽  
Vol 177 ◽  
pp. 1-10 ◽  
Author(s):  
Ting Guan ◽  
Shun Sun ◽  
Yunzhi Gao ◽  
Chunyu Du ◽  
Pengjian Zuo ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Accelerated Aging ◽  
Mesocarbon Microbeads

Analysis of Degraded Gold-Plated Surfaces in Contact With Lead-TiN Solder During Elevated Temperature Testing of 208- PIN Microelectronic Packages

1999 ◽  
Vol 5 (S2) ◽  
pp. 738-739
Author(s):  
Jake Schaper ◽  
Ron Weberg
Keyword(s):  
Elevated Temperature ◽  
Bias Voltage ◽  
Aging Process ◽  
Visual Inspection ◽  
New Products ◽  
Accelerated Aging ◽  
Analysis Data ◽  
Specific Time ◽  
Microelectronic Packages

This report provides analysis data on black deposits observed on gold-plated test socket pads. The socket pads are an integral part of a burn-in test where the test simulates an accelerated aging process and is routinely performed on new products. The test consists of placing a device, as shown in Figure 1, with lead/tin plated copper leads in a test socket then placing that assembly into a “burn-in” oven set to a specific elevated temperature, 150° C in this case, for a specific time. Typically, a bias voltage is applied through the pads on the socket during the test. Historically, during extended burn-in tests of Quad Flat Pack (QFP) devices, problems arose when several devices unexpectedly exhibited open socket-to-device contacts. The “opens” problem repeated itself when new QFP devices were installed in the sockets . Upon visual inspection of the sockets, black deposits were observed in the contact regions, as shown in Figure 2.

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