Effects of the Molecular Chain Length of Polyimide on the Characteristics of Organic Resistive Random Access Memories

2020 ◽  
Vol 67 (1) ◽  
pp. 277-282 ◽  
Author(s):  
Chi-Chang Wu ◽  
Wen-Fa Wu ◽  
Guan-Wei Lin ◽  
Wen-Luh Yang
Keyword(s):  
Chain Length ◽  
Random Access ◽  
Molecular Chain

Mechanical Chain-Scission in Rubber Vulcanizate at Low Temperatures

1979 ◽  
Vol 52 (4) ◽  
pp. 773-780 ◽  
Author(s):  
T. Kusano ◽  
K. Kobayashl ◽  
K. Murakami
Keyword(s):  
Free Radicals ◽  
Chain Length ◽  
Low Temperatures ◽  
Crosslink Density ◽  
Glassy State ◽  
Chain Scission ◽  
Molecular Chain ◽  
Yield Strain ◽  
Air Stream ◽  
Intermolecular Reaction

Abstract When vulcanized natural rubbers are forced to extend in the glassy state, free radicals are produced by the scission of the primary chain. The amount of the free radicals increases with the strain. The tensile yield strain decreases with the decrease of the molecular chain length between crosslinks. This behavior is explainable on the basis of the limited chain extensibility. The extended chains are broken with further increases of the strain. The mechanically produced free radicals are quite stable below about −40°C. The crosslink density of the chain-ruptured material increases about 2∼3×10−5 mol/cm3. This fact shows that the free radicals are consumed not only by recombination but by the intermolecular reaction. In both sulfur and DCP vulcanizates, the network chains rather than the crosslinks are broken by stretching. In an air stream, some free radicals react with oxygen and others form crosslinks.

Properties of Cotton Fabrics Crosslinked with Different Molecular Chain Lengths of Aldehyde Agents

1992 ◽  
Vol 62 (9) ◽  
pp. 547-551 ◽  
Author(s):  
Tsang-Yuh Liang ◽  
Jenn-Yann Hwang ◽  
Der-Shiann Ju ◽  
Cheng-Chi Chen
Keyword(s):  
Activation Energy ◽  
Chain Length ◽  
Cotton Fabric ◽  
Crosslinking Agent ◽  
Cotton Fabrics ◽  
Molecular Chain ◽  
Diffusion Resistance ◽  
Adsorption Time ◽  
Untreated Cotton ◽  
Chain Lengths

Adsorption time curves from finite baths have been studied for untreated cotton fabric and cottons treated with differing molecular chain lengths of aldehydes (formaldehyde and glutaraldehyde). Crosslinking reduced the rate constant, structural diffusion resistance constant, and equilibrium adsorption of dyeing. Additionally, these data decreased with increasing agent concentration and with increasing molecular chain length of the crosslinking agent. The dyeing activation energy of the glutaraldehyde treated fabric was lower than that of the formaldehyde treated fabric.

Thermal transport in electrospun vinyl polymer nanofibers: effects of molecular weight and side groups

Soft Matter ◽  
2018 ◽  
Vol 14 (47) ◽  
pp. 9534-9541 ◽  
Author(s):  
Yin Zhang ◽  
Xin Zhang ◽  
Lin Yang ◽  
Qian Zhang ◽  
Matthew L. Fitzgerald ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Molecular Weight ◽  
Chain Length ◽  
Thermal Transport ◽  
Molecular Chain ◽  
Polymer Nanofibers ◽  
Vinyl Polymer

Thermal conductivity increases with molecular chain length for PE nanofibers, and is higher for vinyl polymer nanofibers with lighter and more symmetric side groups.

Development of a novel microviscosity model based on molecular chain length

2014 ◽  
Vol 21 (5) ◽  
pp. 1121-1130 ◽  
Author(s):  
Yan Lou ◽  
Jiulong Pei ◽  
Peiqian He ◽  
Xiaoyu Wu
Keyword(s):  
Chain Length ◽  
Molecular Chain ◽  
Model Based

On the critical molecular chain length of polydimethylsiloxane

1993 ◽  
Vol 49 (9) ◽  
pp. 1497-1507 ◽  
Author(s):  
Petar R. Dvornic ◽  
Jelena D. Jovanovic ◽  
Milutin N. Govedarica
Keyword(s):  
Chain Length ◽  
Molecular Chain

scholarly journals Effects of Molecular Chain Length on the Contact Line Movement in Water/n-Alkane/Solid Systems

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2081
Author(s):  
Wenxiu Zheng ◽  
Chengzhen Sun ◽  
Boyao Wen ◽  
Bofeng Bai ◽  
Eric Lichtfouse
Keyword(s):  
Chain Length ◽  
Solid Surface ◽  
Contact Line ◽  
Molecular Chain ◽  
Dynamics Simulation ◽  
Jump Frequency ◽  
Molecular Kinetic Theory ◽  
Three Phase ◽  
Chain Lengths ◽  
Line Movement

The movement of the contact line in liquid-liquid-solid systems is a major phenomenon in natural and industrial processes. In particular, n-alkanes are widely occurring in the oil, soil pollution, and chemical industries, yet there is little knowledge on the effects of molecular chain length on the contact line movement. Here, we studied the effects of molecular chain length on the contact line movement in water/n-alkane/solid systems with different surface wettabilities. We used n-heptane (C7), n-decane (C10), and n-hexadecane (C16) as alkanes and α-quartz as the solid surface. We calculated the time-variation contact line moving velocity and also analyzed the jump frequency and the mean distance of the molecular displacement occurring within the contact line zone by molecular-kinetic theory. Molecular dynamics simulation results show that the contact line velocity decreases with increasing the chain length, originally caused by the decreasing the jump frequency and mean distance. These variations with the molecular chain length are related to the more torsions and deformations of the molecules with a longer chain length. In addition, the moving mechanism of the contact line on the same solid surface does not change at different molecular chain lengths, implying that the moving mechanism mainly depends on the three-phase wettability.

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