Investigation of the accelerated thermal aging behavior of polyetherimide and lifetime prediction at elevated temperature

Cho, Chungyeon; Nam, Seo Lin; Mata, A. Paulina de la; Harynuk, James J.; Elias, Anastasia L.; Chung, Hyun‐Joong; Dolez, Patricia I.

doi:10.1002/app.51955

Cited by 17 publications

(15 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sacrificial polymers behave similarly to the outer shell fabrics of firefighters' protective garments when exposed to the ageing conditions of heat, UV light, and moisture [9][10]. The exposure to ageing conditions will initiate a degradation in the sacrificial polymer layer of the sensor, ultimately disrupting the conductivity of the conductive track [8].…”

Section: Introductionmentioning

confidence: 99%

Towards commercialization of graphene-based end-of-life sensors for fire-protective fabrics

Yehia¹,

Lawson²,

King³

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Fire-resistant (FR) fabrics used in protective clothing experience a reduction in performance as a result of exposure to various ageing conditions, for instance: heat, ultraviolet (UV) light, moisture, abrasion and laundering procedures. However, there are few visible clues to indicate if the deterioration of the protective clothing has reached a dangerous level. To address this issue, graphene-based end-of-life sensors (heat, UV light, and moisture) are being developed at the University of Alberta in collaboration with five industry partners, including Davey Textile Solutions, Inc (DTS). DTS has the production capacity to manufacture the graphene-based end-of-life sensors, including weaving, finishing, conductive track application, fusing, and product assembly. The lifetime of fire-protective clothing is an important parameter to monitor, and the graphene-based end-of-life sensors are a straightforward, non-destructive, and effective tool for this purpose. The plan is to fabricate, integrate and commercialize the sensors. DTS, alongside academic researchers from the University of Alberta, are in the process of scaling up the manufacturing and testing of the sensors. The health and safety of firefighters will be improved by bringing graphene-based end-of-life sensors to the market.

show abstract

Section: Introductionmentioning

confidence: 99%

Towards commercialization of graphene-based end-of-life sensors for fire-protective fabrics

Yehia¹,

Lawson²,

King³

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…As the air-gap thickness increased, flaking of the original filaments on the fiber surface occurred; this was due to incomplete fiber fracturing owing to uneven heating. 28 No significant changes in raw-filament fracturing or the fiber fracture openings were observed with increased airflow velocity. However, the experimental sample groups with added under-clothing airflow exhibited more raw filament breakage than the control group without additional airflow.…”

Section: Fabric Morphologymentioning

confidence: 95%

“…From the perspective of thermal decomposition, cross-linking, and molecular chain breakage occurs when polymers thermally age. 28 Initially, thermal aging mainly involves polymer cross-linking; as the temperature increases, the weak bonds in the polymer chains break first. This is followed by molecular chain breakage, which eventually causes fiber breakage.…”

Section: Fabric Morphologymentioning

confidence: 99%

Effects of under‐clothing airflow on thermal protective performance and thermal aging behaviors of flame‐retardant fabric

Zhang,

Tian,

Huang

et al. 2023

Fire and Materials

View full text Add to dashboard Cite

To investigate the effects of under‐clothing airflows on the thermal protection performance (TPP) and thermal aging of flame‐retardant fabrics, we constructed an under‐clothing air‐gap ventilation device based on the TPP tester. This device can generate different levels of airflow velocities such as 0.17, 1.0, and 2.0 m/s. The flame‐retardant fabrics were exposed to a heat flux of 30 kW/m2 to simulate an indoor fire scene. The impacts of under‐clothing airflows on the heat transfer behaviors of fabrics were analyzed with the temperature rise measured by thermocouples. The thermal aging behavior of the fabric was investigated based on the outer‐shell morphology, mass loss, and residual tensile strength. The results of this study indicated that the under‐clothing airflow enhanced the TPP of flame‐retardant fabric and the best TPP was achieved under the airflow of 1.0 m/s. Under‐clothing airflow increased the post‐thermal‐exposure mass loss of the fabric but did not further decrease the tensile strength. Higher severity thermal aging occurred for 2.0 m/s airflow than for 1.0 m/s airflow. The findings of this study are important for TPP prediction for firefighters' clothing and will help optimize firefighters' clothing design.

show abstract

“…The typical peaks of C=O vibration at 1776 and 1722 cm −1 , C-N stretching vibration at 1357 and 1238 cm −1 were attributable to the PEI fibrous network and the O-H peak at 3416 cm −1 is the characteristic peak of Ti 3 C 2 T x MXene nanosheets. [34][35] The microstructure of MXene/PEI fibrous network was also analyzed by 3D optical profiler, as detailed in Figure 1h. It is revealed that the MXene/PEI fibrous network was randomly distributed with microscopic protrusions, allowing for the construction of highly sensitive piezoresistive sensor.…”

Section: Preparation and Characterization Of Mxene/pei Piezoresistive...mentioning

confidence: 99%

3D MXene‐Based Flexible Network for High‐Performance Pressure Sensor with a Wide Temperature Range

Xie

Cheng

et al. 2022

Advanced Science

View full text Add to dashboard Cite

With the increasing popularity of smart wearable devices, flexible pressure sensors are highly desired in various complex application scenarios. A great challenge for existing flexible pressure sensors is to maintain high sensitivity over a wide temperature range, which is critical for their applications in harsh environments. Herein, a flexible piezoresistive sensor made of polyetherimide (PEI) fibrous network evenly covered with MXene nanosheets is reported to construct conductive pathways, showing ultrahigh sensitivity over a wide temperature range from −5 °C (sensitivity of 80 kPa −1 ) to 150 °C (20 kPa −1 ), low detection limit of 9 Pa, fast response time of 163 ms, outstanding durability over 10 000 cycles at room temperature, 2000 cycles at 100 °C and 500 cycles at −5 °C. The pressure sensor can monitor various human activities in real-time, apply to human-machine interaction, and measure pressure distribution. It also can sensitively respond to external mechanical stimuli at 150 °C and extremely low temperature (in liquid nitrogen). Moreover, the fibrous network exhibits an excellent Joule heating performance, which can reach 78 °C at an applied voltage of 12 V. Thus, the piezoresistive sensor has considerable potential for wearable garments and personal heating applications in harsh temperature conditions.

show abstract

Investigation of the accelerated thermal aging behavior of polyetherimide and lifetime prediction at elevated temperature

Cited by 17 publications

References 66 publications

Towards commercialization of graphene-based end-of-life sensors for fire-protective fabrics

Towards commercialization of graphene-based end-of-life sensors for fire-protective fabrics

Effects of under‐clothing airflow on thermal protective performance and thermal aging behaviors of flame‐retardant fabric

3D MXene‐Based Flexible Network for High‐Performance Pressure Sensor with a Wide Temperature Range

Contact Info

Product

Resources

About