Amorphous polyamide m ‐xylylenediamine‐adipic acid‐isophthalic acid copolymer (MXD6I) : Evaluation of oxygen barrier property and free volume in high humidity condition

2022 ◽  
Author(s):  
Masaki Yamanaka ◽  
Takahiro Muraya ◽  
Takahumi Oda ◽  
Nobuya Saegusa ◽  
Ryota Watanabe ◽  
...  
Keyword(s):  
Free Volume ◽  
Adipic Acid ◽  
Isophthalic Acid ◽  
Barrier Property ◽  
High Humidity ◽  
Oxygen Barrier ◽  
Humidity Condition ◽  
Acid Copolymer ◽  
Oxygen Barrier Property ◽  
High Humidity Condition

Modeling of Stiffness Reduction of Vibration Conveyor Springs Subjected to Ultra High Cyclic Loading under High Humidity

2011 ◽  
Vol 471-472 ◽  
pp. 975-980
Author(s):  
Takahiko Yoshi ◽  
Kazuya Okubo ◽  
Toru Fujii
Keyword(s):  
Crack Propagation ◽  
Creep Deformation ◽  
Crack Tip ◽  
Time Dependent ◽  
High Humidity ◽  
Humidity Condition ◽  
Stiffness Reduction ◽  
Carbon Fiber Cloth ◽  
Plate Spring ◽  
High Humidity Condition

Significant stiffness reduction of the plate spring due to delaminations around the interwoven cloths could be prevented by using CFRTP (carbon fiber cloth and Polyethylene Terephthalate (PET)) rather than that by using CFRP (carbon fiber cloth and epoxy), when ultra high cyclic loading was applied to the plate spring under high humidity condition. To explain the result, the prediction model of stiffness reduction was introduced considering time-dependent crack propagation accompanying with creep deformation around the crack tip. Stiffness reduction of CFRP under high humidity condition was not only determined by cyclic crack propagation but also by time-dependent crack propagation accompanying with creep deformation around the crack tip. It was found that CFRTP was effective material of the plate springs on vibration conveyer for the uses under high humidity condition to prevent significant stiffness reduction, where the crack propagation accompanying with creep deformation should be prevented around the crack tip.

Study of interaction between polyimide and Cu under a high humidity condition

2001 ◽  
Vol 171 (1-2) ◽  
pp. 101-105 ◽  
Author(s):  
N. Nagai ◽  
T. Hironaka ◽  
T. Imai ◽  
T. Harada ◽  
M. Nishimura ◽  
...  
Keyword(s):  
High Humidity ◽  
Humidity Condition ◽  
High Humidity Condition

Evaluation method for thermal protection of firefighters’ clothing in high-temperature and high-humidity condition

2016 ◽  
Vol 28 (4) ◽  
pp. 429-448 ◽  
Author(s):  
Yun Su ◽  
Yunyi Wang ◽  
Jun Li
Keyword(s):  
High Temperature ◽  
Protective Clothing ◽  
Thermal Protection ◽  
Evaluation Methods ◽  
Moisture Distribution ◽  
High Humidity ◽  
Thermal Hazards ◽  
Content Type ◽  
Humidity Condition ◽  
High Humidity Condition

Purpose – The purpose of this paper is to provide the details of developments to researchers in test apparatus and evaluation methods to rate the thermal protective performance (TPP) of firefighters’ clothing under high-temperature and high-humidity condition. Design/methodology/approach – This review paper describes the influence laws of moisture on thermal protection and the moisture distribution in actual fire environment. Different evaluation methods used for assessing the effect of moisture on the TPP were investigated, with an emphasis on test devices, evaluation indexes as well as their relationship and limitations. Findings – The moisture from the ambient, clothing and human perspiration plays an important role in determining the TPP of firefighter protective clothing. It is obvious that research on moisture-driven heat transfer in firefighter’s clothing system are comparatively little, primarily focussing on pre-wetted methods of multi-layer fabric. Further studies should be conducted to develop more standardized moistening systems and improve the current calculation methods for evaluating the performance of protective clothing. New explorations for heat and moisture transfer mechanism in protective clothing should be investigated. Practical implications – Protective clothing is the efficient way to provide fire-fighting occupational safety. To accurately evaluate the TPP of protective clothing under high-temperature and high-humidity condition will help to optimize the clothing performance and choose the proper clothing for providing firefighters with the best protection under multiple thermal hazards. Originality/value – This paper is offered as a concise reference for scientific community further research in the area of the TPP evaluation methods under high-temperature and high-humidity condition.

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