scholarly journals Environmentally Sensitive Luminescence Reveals Spatial Confinement, Dynamics, and Their Molecular Weight Dependence in a Polymer Glass

2021 ◽  
Author(s):  
Stephen J. Picken ◽  
Georgy A. Filonenko
Keyword(s):  
Molecular Weight ◽  
Spatial Confinement ◽  
Polymer Glass ◽  
Molecular Weight Dependence ◽  
Environmentally Sensitive

scholarly journals Environmentally Sensitive Luminescence Reveals Spatial Confinement, Dynamics and Their Molecular Weight Dependence in a Polymer Glass

2021 ◽  
Author(s):  
Stephen Picken ◽  
Georgy Filonenko
Keyword(s):  
Molecular Weight ◽  
Molecular Probes ◽  
Key Factors ◽  
Polymer Glasses ◽  
Polymer Glass ◽  
Irregular Structure ◽  
Glassy Materials ◽  
Environmentally Sensitive ◽  
Induced Defects ◽  
The Impact

Polymer glasses have an irregular structure. Among the causes for such complexity are the chemically distinct chain end-groups that are the most abundant irregularities in any linear polymer. In this work we demonstrate that chain end induced defects allow polymer glasses to create confined environments capable of hosting small emissive molecules. Using environmentally sensitive luminescent complexes we show that the size of these confinements depends on molecular weight and can dramatically affect the photoluminescence of free or covalently bound emissive complexes. We confirm the impact of chain end confinement on the bulk glass transition in poly(methyl acrylate) and show that commonly observed T<sub>g</sub> changes induced by the chain ends should have a structural origin. Finally, we demonstrate that size and placement of luminescent molecular probes in pMA can dramatically affect the probe luminescence and its temperature dependence suggesting that polymer glass is a highly irregular and complex environment marking its difference with conventional small molecule solvents. Considering the ubiquity of luminescent glassy materials, our work lays down a blueprint for designing them with structural considerations in mind, ones where packing density and chain end size are key factors.

scholarly journals Environmentally Sensitive Luminescence Reveals Spatial Confinement, Dynamics and Their Molecular Weight Dependence in a Polymer Glass

2021 ◽  
Author(s):  
Stephen Picken ◽  
Georgy Filonenko
Keyword(s):  
Molecular Weight ◽  
Molecular Probes ◽  
Key Factors ◽  
Polymer Glasses ◽  
Polymer Glass ◽  
Irregular Structure ◽  
Glassy Materials ◽  
Environmentally Sensitive ◽  
Induced Defects ◽  
The Impact

Polymer glasses have an irregular structure. Among the causes for such complexity are the chemically distinct chain end-groups that are the most abundant irregularities in any linear polymer. In this work we demonstrate that chain end induced defects allow polymer glasses to create confined environments capable of hosting small emissive molecules. Using environmentally sensitive luminescent complexes we show that the size of these confinements depends on molecular weight and can dramatically affect the photoluminescence of free or covalently bound emissive complexes. We confirm the impact of chain end confinement on the bulk glass transition in poly(methyl acrylate) and show that commonly observed T<sub>g</sub> changes induced by the chain ends should have a structural origin. Finally, we demonstrate that size and placement of luminescent molecular probes in pMA can dramatically affect the probe luminescence and its temperature dependence suggesting that polymer glass is a highly irregular and complex environment marking its difference with conventional small molecule solvents. Considering the ubiquity of luminescent glassy materials, our work lays down a blueprint for designing them with structural considerations in mind, ones where packing density and chain end size are key factors.

Molecular weight dependence of the conformational phase transition and electroluminescence of diarylpolysilane diodes

2000 ◽  
Vol 88 (6) ◽  
pp. 3408-3413 ◽  
Author(s):  
Satoshi Hoshino ◽  
Kazuaki Furukawa ◽  
Keisuke Ebata ◽  
Ingo Breyl ◽  
Hiroyuki Suzuki
Keyword(s):  
Phase Transition ◽  
Molecular Weight ◽  
Molecular Weight Dependence

Composition and molecular-weight dependence of the glass transition in polystyrene-poly(2,6-dimethylphenylene ether) blends

Polymer ◽  
1988 ◽  
Vol 29 (12) ◽  
pp. 2235-2243 ◽  
Author(s):  
Marco Aurelio de Araujo ◽  
Reimund Stadler ◽  
Hans-Joachim Cantow
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Molecular Weight Dependence

Power law of molecular weight dependence of lateral growth rate of isotactic polypropylene

Polymer ◽  
2006 ◽  
Vol 47 (21) ◽  
pp. 7601-7606 ◽  
Author(s):  
Koji Yamada ◽  
Kaori Watanabe ◽  
Kiyoka Okada ◽  
Akihiko Toda ◽  
Masamichi Hikosaka
Keyword(s):  
Molecular Weight ◽  
Growth Rate ◽  
Power Law ◽  
Isotactic Polypropylene ◽  
Lateral Growth ◽  
Molecular Weight Dependence ◽  
Lateral Growth Rate
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