Chain length effect on thermal transport in amorphous polymers and a structure–thermal conductivity relation

Wei, Xingfei; Luo, Tengfei

doi:10.1039/c9cp02397f

Cited by 76 publications

(68 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several molecular dynamics studies on polyethylene melts have found that λ increases with M with a similar dependence to that found on the experimental results by Hansen et al [11]. However, the increase in λ is limited to low molecular weights [18,19,20], and all the mentioned simulation studies showed deviations from the proposed N 1/2 model, with a plateau in λ over the critical molecular weight or chain length limit N c = 2N e . Unfortunately, the range of molecular weights covered by these simulations did not correspond to those investigated experimentally [11] due to the computational cost required to equilibrate large molecular weight polymeric melts.…”

Section: Introductionsupporting

confidence: 77%

Thermal conductivity of amorphous polymers and its dependence on molecular weight

Kiessling

Simavilla

Vogiatzis

et al. 2021

Polymer

View full text Add to dashboard Cite

Section: Introductionsupporting

confidence: 77%

Thermal conductivity of amorphous polymers and its dependence on molecular weight

Kiessling

Simavilla

Vogiatzis

et al. 2021

Polymer

View full text Add to dashboard Cite

“…It can be expected that PBD200k, because of its longer chain length and therefore more unsaturation compared to PBD5k chain, is more susceptible to thermo-oxidative degradation. It has also been established before that increasing chain length in polymers leads to an increase in thermal conductivity [31], and increased thermal conductivity has been linked before to increased droplet combustion rates [17]. Also, due to easier C-C bond scission in longer chain polymers compared to short chain polymers, PBD200k is more susceptible to thermal degradation compared to PBD5k [32].…”

Section: Resultsmentioning

confidence: 94%

Effect of carbon-based nanoparticles on the ignition, combustion and flame characteristics of crude oil droplets

Singh

Esmaeilpour

Ratner

2020

Energy

View full text Add to dashboard Cite

The use of in-situ burning (ISB) as a clean-up response in the event of an oil spill has generated controversy because of unburned hydrocarbons and products of incomplete combustion left behind on an ISB site. These substances threaten marine life, both in the ocean and on the ocean floor. Treating crude oil as a multicomponent liquid fuel, this manuscript investigates the effect of carbon-based nanomaterials, acetylene black (AB) and multi-walled carbon nanotube (MWNT), on the combustion and flame characteristics of crude sourced from the Bakken formation (ND, USA). Sub-millimeter droplets of colloidal suspensions of Bakken crude and nanomaterials at various particle loadings were burned, and the process was captured with CMOS and CCD cameras. The resulting images were post-processed to generate burning rate, ignition delay, total combustion time, and flame stand-off (FSR) ratio data for the various crude suspensions. A maximum combustion rate enhancement of 39.5% and 31.1% was observed at a particle loading of 0.5% w/w acetylene black nanoparticles and 0.5% w/w multi-walled carbon nanotubes, respectively. Generally, FSR for pure Bakken was noted as larger than for Bakken with nanoparticle additives. These results are expected to spur further investigations into the use of nanomaterials for ISB crude oil clean-ups.

show abstract

“…[6][7][8][9] A number of recent studies have revealed that polymer thermal conductivity is strongly related to its molecular level conformation. 6,8,[10][11][12][13][14] For example, stiffer molecular backbones can make the chains straighter even in the amorphous state 15 and thus increase the amount of heat that can be transferred through the strong backbone. 12 In polymer blends, it is reported that increasing the inter-chain interaction through engineering hydrogen bonds can stretch the polymer chains and enhance the thermal conductivity up to 1.5 W/(m.K).…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity of Polyelectrolytes with Different Counterions

Wei

Luo

2020

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

Polyelectrolytes are important to many applications, such as electronics and batteries. In this work, we study the thermal conductivity of polyelectrolytes with different counterions using molecular dynamics (MD) simulations. Both anionic and cationic polyelectrolytes, including poly(acrylic acid) and poly(allylamine hydrogen halide), are investigated. We have simulated a total number of 17 polyelectrolytes with different counterions and we find that all of them have thermal conductivity values between 0.2 and 0.7 W/(m.K). By analyzing thermal conductivity against different counterion descriptors (atomic mass, atomic radius, van der Waals radius and ionic radius), we find a strong negative relationship between thermal conductivity and the ionic radii of counterions. We rationalize such a discovery through analyzing the heat flux at molecular level and find that thermal conductivity shows a general increasing trend with respect to the interatomic non-bonding forces and atomic velocities. We have also found a positive correlation between the MD-calculated thermal conductivity and that from the minimum thermal conductivity model, and this correlation can also be traced back to the same molecular level origin. Our study provides new insights to the heat transfer physics in polymers and may help scientists develop polyelectrolytes with desirable thermal conductivity.

show abstract

Chain length effect on thermal transport in amorphous polymers and a structure–thermal conductivity relation

Abstract: The physics of thermal transport in polymers is important in many applications, such as in heat exchangers and electronics packaging.

Cited by 76 publications

References 51 publications

Thermal conductivity of amorphous polymers and its dependence on molecular weight

Thermal conductivity of amorphous polymers and its dependence on molecular weight

Effect of carbon-based nanoparticles on the ignition, combustion and flame characteristics of crude oil droplets

Thermal Conductivity of Polyelectrolytes with Different Counterions

Contact Info

Product

Resources

About