Physical Properties of Polymers Under Soft and Hard Nanoconfinement: A Review

Ma, Mingchao; Guo, Yunlong

doi:10.1007/s10118-020-2380-3

Cited by 20 publications

(18 citation statements)

References 168 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It also means that crystallization of the long alkyl side groups can strongly disturb both the first- and second-level structures, leading to the disordering of the structures. For crystallization from the ordered melt of crystalline-rubbery diblock copolymers, different types of crystallization, such as confined, breakout, and templated crystallization, have been observed, depending on the composition and relative segregation strength of crystallization over microphase separation. − However, breakout crystallization may result in distortion or undulation of the crystalline microdomains and thus reduced ordering degree of the microphase-separated structure, which have been revealed by direct transmission electron microscopy (TEM) observations and broadened SAXS primary peaks. − Sometimes, the high-order peaks may even disappear in the SAXS profile . Herein, the disordered first- and second-level structures in PEO 114 - b -P(AOEDIm-PF 6 ) n BCPs can also be attributed to the breakout crystallization of the long alky side chains.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Structures with Double Lower Disorder-to-Order Transition and Closed-Loop Phase Behaviors in Charged Block Copolymers Bearing Long Alkyl Side Groups

et al. 2020

View full text Add to dashboard Cite

In this work, poly(ionic liquid) (PIL)-containing block copolymers (BCPs), poly(ethylene oxide)-b-poly(1-((2acryloyloxy)ethyl)-3-docosylimidazolium) with different counterions (PEO-b-P(AOEDIm-X), X = Br or PF 6 ), were synthesized. Hierarchical structures, including the microphase-separated structure between the PEO and PIL blocks at the first level, the segregated substructure between the long alkyl side groups and the other parts of the PIL block at the second level, and the crystalline or liquid crystalline (LC) structure of the long alkyl side groups at the third level, are formed in these BCPs. The relative orientation of hierarchical structures and the interplay between hierarchical structures at different levels were investigated. In weakly segregated BCPs, the breakout crystallization of the long alkyl side groups can first disturb the second-level structure and then cause cascade disordering of the first-level structure, leading to double lower disorder-to-order transition (LDOT) phase behaviors at low temperatures. In addition, when the order-to-disorder transition (ODT) occurs for the first-level structure at high temperatures, it will force the second-level structure to switch into the disordered state, resulting in synchronous ODTs of hierarchical structures. The results of this work provide new insight into the design of hierarchical structures with special phase behaviors in BCPs.

show abstract

Section: Resultsmentioning

confidence: 99%

Hierarchical Structures with Double Lower Disorder-to-Order Transition and Closed-Loop Phase Behaviors in Charged Block Copolymers Bearing Long Alkyl Side Groups

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Due to dopant fixation in the film matrix at higher temperatures, thermodynamic transitions of the polymer must be taken into account. Thin polymer films manifest different behavior when exposed to increased temperatures compared to bulk systems due to their spatial confinement [ 7 ]. It has already been discovered that films with thickness below 100 nm show substantial deviation of their glass transition temperature ( T g ) [ 8 ], which is dependent on 1) the type of film, either free-standing [ 9 , 10 ] or substrate-supported [ 11 ], (2) polymer–substrate interactions that can increase the T g of a film above a bulk value and broaden its range [ 12 ], or (3) the molecular weight of the polymer [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Incorporation of the New anti-Octadecaborane Laser Dyes into Thin Polymer Films: A Temperature-Dependent Photoluminescence and Infrared Spectroscopy Study

Čapková

Hanulíková

Ševčík

et al. 2022

IJMS

View full text Add to dashboard Cite

New anti-octadecaborane(22) laser dyes have been recently introduced. However, their application in solid thin films is limited, despite being very desirable for electronics. Spectroscopic methods, photoluminescence (PL), and infrared reflection–absorption spectroscopy (IRRAS), are here used to reveal structural responses to a temperature change in thin polymer films made of π- and σ-conjugated and non-conjugated polymers and anti-octadecaborane(22) and its tetra-alkylatedderivatives. It has been observed that borane clusters are not firmly fixed within polymer matrices and that their ability for diffusion out of the polymer film is unprecedented, especially at higher temperatures. This ability is related to thermodynamic transitions of polymer macromolecular chains. PL and IRRAS spectra have revealed a clear correlation with β-transition and α-transition of polymers. The influence of structure and molecular weight of a polymer and the concentration and the substitution type of clusters on mobility of borane clusters within the polymer matrix is demonstrated. A solution is proposed that led to an improvement of the temperature stability of films by 45 °C. The well-known spectroscopic methods have proved to be powerful tools for a non-routine description of the temperature behavior of both borane clusters and polymer matrices.

show abstract

“…Nanoconfined material structures, including polymers as well, due to the wide range of unique structural features, properties, and effects arising under nanocompartmentalized conditions, have created significant worldwide interest over the last couple of years (see e.g., references [ 1 , 2 , 3 , 4 , 5 , 6 ] and references therein). The recently emerged polymer conetworks, especially amphiphilic conetworks (APCNs), composed of covalently or supramolecularly bonded, otherwise immiscible, hydrophilic and hydrophobic polymer chains, belong to such nanophase-separated materials with mutually nanoconfined macromolecular components [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

Nanoconfined Crosslinked Poly(ionic liquid)s with Unprecedented Selective Swelling Properties Obtained by Alkylation in Nanophase-Separated Poly(1-vinylimidazole)-l-poly(tetrahydrofuran) Conetworks

et al. 2020

View full text Add to dashboard Cite

Despite the great interest in nanoconfined materials nowadays, nanocompartmentalized poly(ionic liquid)s (PILs) have been rarely investigated so far. Herein, we report on the successful alkylation of poly(1-vinylimidazole) with methyl iodide in bicontinuous nanophasic poly(1-vinylimidazole)-l-poly(tetrahydrofuran) (PVIm-l-PTHF) amphiphilic conetworks (APCNs) to obtain nanoconfined methylated PVImMe-l-PTHF poly(ionic liquid) conetworks (PIL-CNs). A high extent of alkylation (~95%) was achieved via a simple alkylation process with MeI at room temperature. This does not destroy the bicontinuous nanophasic morphology as proved by SAXS and AFM, and PIL-CNs with 15–20 nm d-spacing and poly(3-methyl-1-vinylimidazolium iodide) PIL nanophases with average domain sizes of 8.2–8.4 nm are formed. Unexpectedly, while the swelling capacity of the PIL-CN dramatically increases in aprotic polar solvents, such as DMF, NMP, and DMSO, reaching higher than 1000% superabsorbent swelling degrees, the equilibrium swelling degrees decrease in even highly polar protic (hydrophilic) solvents, like water and methanol. An unprecedented Gaussian-type relationship was found between the ratios of the swelling degrees versus the polarity index, indicating increased swelling for the nanoconfined PVImMe-l-PTHF PIL-CNs in solvents with a polarity index between ~6 and 9.5. In addition to the nanoconfined structural features, the unique selective superabsorbent swelling behavior of the PIL-CNs can also be utilized in various application fields.

show abstract

Physical Properties of Polymers Under Soft and Hard Nanoconfinement: A Review

Cited by 20 publications

References 168 publications

Hierarchical Structures with Double Lower Disorder-to-Order Transition and Closed-Loop Phase Behaviors in Charged Block Copolymers Bearing Long Alkyl Side Groups

Hierarchical Structures with Double Lower Disorder-to-Order Transition and Closed-Loop Phase Behaviors in Charged Block Copolymers Bearing Long Alkyl Side Groups

Incorporation of the New anti-Octadecaborane Laser Dyes into Thin Polymer Films: A Temperature-Dependent Photoluminescence and Infrared Spectroscopy Study

Nanoconfined Crosslinked Poly(ionic liquid)s with Unprecedented Selective Swelling Properties Obtained by Alkylation in Nanophase-Separated Poly(1-vinylimidazole)-l-poly(tetrahydrofuran) Conetworks

Contact Info

Product

Resources

About