Side‐chain crystallization and phase transition of poly(styrene‐co‐maleic anhydride)‐ g ‐alkyl amine comb‐like polymers

2021 ◽  
Author(s):  
Huiqin Mao ◽  
Yanpeng Wang ◽  
Haixia Wang ◽  
Lang Li ◽  
Haifeng Shi
Keyword(s):  
Phase Transition ◽  
Maleic Anhydride ◽  
Side Chain ◽  
Alkyl Amine

Phase Transition and Side-Chain Crystallization of Poly(methyl vinyl ether-alt-maleic anhydride)-g-Alkyl Alcohol Comb-like Polymers

2018 ◽  
Vol 51 (21) ◽  
pp. 8922-8931 ◽  
Author(s):  
Jing Li ◽  
Haixia Wang ◽  
Lei Kong ◽  
Yong Zhou ◽  
Shuqin Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Maleic Anhydride ◽  
Vinyl Ether ◽  
Side Chain ◽  
Methyl Vinyl ◽  
Methyl Vinyl Ether

Phase Transition of Side Chain Liquid Crystal Polyacrylate Studied by Positron Annihilation Lifetime Spectra

1996 ◽  
Vol 12 (08) ◽  
pp. 688-692
Author(s):  
Wang Wen-Hua ◽  
◽  
Wei Long ◽  
Zhang Tian-Bao ◽  
He Liu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Positron Annihilation ◽  
Side Chain ◽  
Positron Annihilation Lifetime

scholarly journals DFT Prediction of Factors Affecting the Structural Characteristics, the Transition Temperature and the Electronic Density of Some New Conjugated Polymers

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1207
Author(s):  
Quoc-Trung Vu ◽  
Thi-Thuy-Duong Tran ◽  
Thuy-Chinh Nguyen ◽  
Thien Vuong Nguyen ◽  
Hien Nguyen ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Conjugated Polymers ◽  
Bond Length ◽  
Density Functional ◽  
Structural Characteristics ◽  
Side Chain ◽  
Electronic Density ◽  
Energy Field ◽  
Energy Bandgap

Conjugated polymers are promising materials for various cutting-edge technologies, especially for organic conducting materials and in the energy field. In this work, we have synthesized a new conjugated polymer and investigated the effect of distance between bond layers, side-chain functional groups (H, Br, OH, OCH3 and OC2H5) on structural characteristics, phase transition temperature (T), and electrical structure of C13H8OS using Density Functional Theory (DFT). The structural characteristics were determined by the shape, network constant (a, b and c), bond length (C–C, C–H, C–O, C–S, C–Br and O–H), phase transition temperatures, and the total energy (Etot) on a base cell. Our finding shows that the increase of layer thickness (h) of C13H8OS–H has a negligible effect on the transition temperature, while the energy bandgap (Eg) increases from 1.646 eV to 1.675 eV. The calculation of bond length with different side chain groups was carried out for which C13H8OS–H has C–H = 1.09 Å; C13H8OS–Br has C–Br = 1.93 Å; C13H8OS–OH has C–O = 1.36 Å, O–H = 0.78 Å; C13H8OS–OCH3 has C–O = 1.44 Å, O–H =1.10 Å; C13H8OS–OC2H5 has C–O = 1.45 Å, C–C = 1.51Å, C–H = 1.10 Å. The transition temperature (T) for C13H8OS–H was 500 K < T < 562 K; C13H8OS–Br was 442 K < T < 512 K; C13H8OS–OH was 487 K < T < 543 K; C13H8OS–OCH3 was 492 K < T < 558 K; and C13H8OS–OC2H5 was 492 K < T < 572 K. The energy bandgap (Eg) of Br is of Eg = 1.621 eV, the doping of side chain groups H, OH, OCH3, and OC2H5, leads to an increase of Eg from 1.621 eV to 1.646, 1.697, 1.920, and 2.04 eV, respectively.

An irreversible phase transition in 1-n-butylindeno[2,1-c]pyran-3,9-dione

2012 ◽  
Vol 68 (10) ◽  
pp. o413-o416 ◽  
Author(s):  
Andrei S. Batsanov ◽  
Judith A. K. Howard ◽  
Na Wu ◽  
Zhen Yang ◽  
Todd B. Marder
Keyword(s):  
Phase Transition ◽  
Ambient Temperature ◽  
Single Crystal ◽  
Title Compound ◽  
Room Temperature ◽  
Side Chain ◽  
Compound C ◽  
Planar Conformation ◽  
Triclinic Phase ◽  
Out Of Plane

At ambient temperature, the title compound, C16H14O3, is triclinic, with then-butyl side chain disordered in an out-of-plane orientation. On cooling below 240 K, it converts into a different triclinic phase with an ordered planar conformation and denser packing, which is retained on warming to room temperature. The transition (occasionally) proceeds from single crystal to single crystal.

Effect of co-monomers' relative concentration on self-assembling behaviour of side-chain liquid crystalline elastomers

RSC Advances ◽  
2014 ◽  
Vol 4 (83) ◽  
pp. 44056-44064 ◽  
Author(s):  
Valentina Domenici ◽  
Jerneja Milavec ◽  
Alexej Bubnov ◽  
Damian Pociecha ◽  
Blaž Zupančič ◽  
...  
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Liquid Crystalline ◽  
Relative Concentration ◽  
Side Chain ◽  
Self Assembling

A new series of liquid single crystal elastomers having a nematic–SmA and a direct isotropic–SmA phase transition.

Side chain pendant non-linear optically active polymers synthesised by grafting reactions on maleic anhydride copolymers

1996 ◽  
Vol 197 (2) ◽  
pp. 687-699 ◽  
Author(s):  
Iain McCulloch ◽  
Ronald Demartino ◽  
Richard Keosian ◽  
Thomas Leslie ◽  
Hong-Tai Man
Keyword(s):  
Maleic Anhydride ◽  
Optically Active ◽  
Side Chain ◽  
Optically Active Polymers ◽  
Non Linear ◽  
Grafting Reactions ◽  
Maleic Anhydride Copolymers

Study on the Melting Mechanism of Maleic Anhydride

2020 ◽  
Vol 10 (1) ◽  
pp. 65-78
Author(s):  
Bratati Das ◽  
Ashis Bhattacharjee
Keyword(s):  
Phase Transition ◽  
Activation Energy ◽  
Maleic Anhydride ◽  
Temperature Dependence ◽  
Growth Models ◽  
Melting Process ◽  
Nucleation And Growth ◽  
Crystalline Solid ◽  
Scanning Calorimetry ◽  
Melting Mechanism

Background: Melting of a pure crystalline material is generally treated thermodynamically which disregards the dynamic aspects of the melting process. According to the kinetic phenomenon, any process should be characterized by activation energy and preexponential factor where these kinetic parameters are derivable from the temperature dependence of the process rate. Study on such dependence in case of melting of a pure crystalline solid gives rise to a challenge as such melting occurs at a particular temperature only. The temperature region of melting of pure crystalline solid cannot be extended beyond this temperature making it difficult to explore the temperature dependence of the melting rate and consequently the derivation of the related kinetic parameters. Objective: The present study aims to explore the mechanism of the melting process of maleic anhydride in the framework of phase transition models. Taking this process as just another first-order phase transition, occurring through the formation of nuclei of new phase and their growth, particular focus is on the nucleation and growth models. Methods: Non-isothermal thermogravimetry, as well as differential scanning calorimetry studies, has been performed. Using isoconversional kinetic analysis, temperature dependence of the activation energy of melting has been obtained. Nucleation and growth models have been utilized to obtain the theoretical temperature dependencies for the activation energy of melting and these dependencies are then compared with the experimentally estimated ones. Conclusion: The thermogravimetry study indicates that melting is followed by concomitant evaporation, whereas the differential scanning calorimetry study shows that the two processes appear in two different temperature regions, and these differences observed may be due to the applied experimental conditions. From the statistical analysis, the growth model seems more suitable than the nucleation model for the interpretation of the melting mechanism of the maleic anhydride crystals.

scholarly journals Percolation Phase Transition from Ionic Liquids to Ionic Liquid Crystals

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Shen Li ◽  
Yanting Wang
Keyword(s):  
Phase Transition ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Chain Length ◽  
Complex Fluids ◽  
Dynamics Simulation ◽  
Coarse Grained ◽  
Side Chain ◽  
Side Chains ◽  
Side Chain Length

Abstract Due to their complex molecular structures and interactions, phase behaviors of complex fluids are quite often difficult to be identified by common phase transition analysis methods. Percolation phase transition, on the other hand, only monitors the degree of connection among particles without strict geometric requirements such as translational or orientational order, and thus suitable for pinpointing phase transitions of complex fluids. As typical complex fluids, ionic liquids (ILs) exhibit phases beyond the description of simple liquid theories. In particular, with an intermediate cationic side-chain length, ILs can form the nanoscale segregated liquid (NSL) state, which will eventually transform into the ionic liquid crystal (ILC) structure when the side chains are adequately long. However, the microscopic mechanism of this transformation is still unclear. In this work, by means of coarse-grained molecular dynamics simulation, we show that, with increasing cationic side-chain length, some local pieces of non-polar domains are gradually formed by side chains aligned in parallel inside the NSL phase, before an abrupt percolation phase transition happens when the system transforms into the ILC phase. This work not only identifies that the NSL to ILC phase transition is a critical phenomenon, but also demonstrates the importance of percolation theory to complex fluids.

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