Synthesis of hydroxypropyl cellulose derivatives modified with amphiphilic diblock copolymer side-chains for the slow release of volatile molecules

2011 ◽  
Vol 2 (9) ◽  
pp. 2093 ◽  
Author(s):  
Damien Loïc Berthier ◽  
Andreas Herrmann ◽  
Lahoussine Ouali
Keyword(s):  
Diblock Copolymer ◽  
Slow Release ◽  
Hydroxypropyl Cellulose ◽  
Side Chains ◽  
Cellulose Derivatives ◽  
Amphiphilic Diblock Copolymer

scholarly journals Side Chain Effect of Hydroxypropyl Cellulose Derivatives on Reflection Properties

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1696 ◽  
Author(s):  
Kenichiro Hayata ◽  
Seiichi Furumi
Keyword(s):  
Bragg Reflection ◽  
Cholesteric Liquid Crystal ◽  
Hydroxypropyl Cellulose ◽  
Side Chains ◽  
Cellulose Derivatives ◽  
Thermally Induced ◽  
Alkyl Groups ◽  
Modeling Calculation ◽  
Phase Temperature ◽  
Esterification Degree

Some cellulose derivatives are known to exhibit thermotropic and lyotropic cholesteric liquid crystal (CLC) phases with a visible reflection feature by changing the side chains and mixing with specific solvents, respectively. Although many studies have been reported so far, most of the derivatives have the side chains of linear alkyl groups, but not the bulky phenyl groups. In this report, we synthesized a series of hydroxypropyl cellulose (HPC) derivatives that possessed both linear propionyl esters and bulky (trifluoromethyl)phenyl carbamates in the side chains. The reflection peaks of HPC derivatives shifted to longer wavelengths upon heating due to an increase in the CLC helical pitch. Such thermally induced shifting behavior of the reflection peak was crucially dependent on not only the propionyl esterification degree, but also the substituents in the side chains of HPC derivatives. When the side chains of HPC were chemically modified with both propionyl esters and bulky substituents such as 3,5-bis(trifluoromethyl)phenyl carbamates, the reflection peaks emerged at longer wavelengths at the same temperature. This probably happened because of the steric hindrance of bulky side chains, as supported by the empirical molecular modeling calculation. Although the occupied volumes of (trifluoromethyl)phenyl groups were independent of the CLC phase temperature with visible Bragg reflection, the substituent position, i.e., substituent orientation of trifluoromethyl groups affected the CLC phase temperature. Moreover, we found that the hydrogen bonds between carbamate moieties in the HPC side chains play an important role in the thermally induced shift of reflection peaks.

Synthesis of poly(methyl methacrylate)-b-poly(acrylic acid) by DPE method

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Dong Chen ◽  
Ruixue Liu ◽  
Zhifeng Fu ◽  
Yan Shi
Keyword(s):  
Molecular Weight ◽  
Acrylic Acid ◽  
Methyl Methacrylate ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Gel Permeation Chromatography ◽  
Amphiphilic Diblock Copolymer ◽  
Poly Methyl Methacrylate ◽  
Copolymer Poly ◽  
Poly Acrylic Acid

AbstractAmphiphilic diblock copolymer poly(methyl methacrylate)-b-poly(acrylic acid) (PMMA-b-PAA) was prepared by 1,1-diphenylethene (DPE) method. Firstly, free radical polymerization of methyl methacrylate was carried out with AIBN as initiator in the presence of DPE, giving a DPE-containing PMMA precursor with controlled molecular weight. tert-Butyl acrylate (tBA) was then polymerized in the presence of the PMMA precursor, and PMMA-b-PtBA diblock copolymer with controlled molecular weight was prepared. Finally, amphiphilic diblock copolymer PMMA-b-PAA was obtained by hydrolysis of PMMA-b-PtBA. The formation of PMMA-b-PAA was confirmed by 1H NMR spectrum and gel permeation chromatography. Transmission electron microscopy and dynamic light scattering were used to detect the self-assembly behavior of the amphiphilic diblock polymers in methanol.

Well-defined skeletal macroporous polymer monoliths fabricated with a novel type of amphiphilic diblock copolymer as a phase separator

Polymer ◽  
2010 ◽  
Vol 51 (15) ◽  
pp. 3410-3415 ◽  
Author(s):  
Peiyong Xin ◽  
Li Qi ◽  
Rongyue Zhang ◽  
Chunhe Yao ◽  
Xiaoyi Wei ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Polymer Monoliths ◽  
Amphiphilic Diblock Copolymer ◽  
Phase Separator

Surface morphology and wetting properties of surfaces coated with an amphiphilic diblock copolymer

2005 ◽  
Vol 575 (1-2) ◽  
pp. 125-135 ◽  
Author(s):  
Maïté Callewaert ◽  
Jean-François Gohy ◽  
Christine C. Dupont-Gillain ◽  
Laurence Boulangé-Petermann ◽  
Paul G. Rouxhet
Keyword(s):  
Surface Morphology ◽  
Diblock Copolymer ◽  
Amphiphilic Diblock Copolymer ◽  
Wetting Properties

Self-Assemble Behavior of Amphiphilic Diblock Copolymer of Methoxy Poly (Ethylene Glycol)/Polyester

2011 ◽  
Vol 295-297 ◽  
pp. 11-15
Author(s):  
Hao Zhou ◽  
Qing Hong Liang ◽  
Xiang Ke Shi ◽  
Li Hua Lu ◽  
Li Qun Zhang ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Light Scattering ◽  
Diblock Copolymer ◽  
Diblock Copolymers ◽  
Average Diameter ◽  
Core Shell ◽  
Amphiphilic Diblock Copolymer ◽  
Amphiphilic Diblock Copolymers ◽  
Methoxy Polyethylene Glycol ◽  
Solution Polycondensation

Amphiphilic diblock copolymers based on methoxy polyethylene glycol (MePEG), 1, 6-hexanediol and maleic anhydride with different molar composition were synthesized by solution polycondensation. Self-assemble behavior of amphiphilic diblock copolymer in different solvents by dialyzing technique was discussed. The micelle morphologhy was observed by TEM. It was found that well core-shell MePEG1900/Polyester 2162 copolymer nanoparticles can be formed by self-assemble in acetone solution. In addition, the size of nanospheres measured using dynamic light scattering exhibited a narrow monodisphere size distribution and an average diameter in the ranger of less than 200nm.

Synthesis and optoelectronics properties of diblock copolymer of P3HT containing thiol-side chains and its hybrid nanocomposite

RSC Advances ◽  
2016 ◽  
Vol 6 (112) ◽  
pp. 110686-110694 ◽  
Author(s):  
Yisha Qiao ◽  
Yixuan Du ◽  
Yinfeng Liu ◽  
Yunbo Li
Keyword(s):  
Absorption Spectra ◽  
Diblock Copolymer ◽  
Side Chains ◽  
Hybrid Nanocomposite ◽  
Broad Absorption ◽  
Elliptical Shape ◽  
Weight Content ◽  
Hybrid Nanoparticle ◽  
Nanoparticle Film

DP-P3HT-SH in global, leaf-like and elliptical shape states exhibiting broad absorption spectra between 300 nm and 650 nm, and the conductivity values of a DP-P3HT-S-AuNPs hybrid nanoparticle film as a function of the weight content of AuNPs.

scholarly journals Synthesis and self-assembly of a novel amphiphilic diblock copolymer consisting of isotactic polystyrene and 1,4-trans-polybutadiene-graft-poly(ethylene oxide)

RSC Advances ◽  
2018 ◽  
Vol 8 (23) ◽  
pp. 12752-12759
Author(s):  
HuaQing Liang ◽  
QiHua Zhou ◽  
YongJiang Long ◽  
WanChu Wei ◽  
Shuo Feng ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Amphiphilic Diblock Copolymer ◽  
Isotactic Polystyrene ◽  
Poly Ethylene Oxide ◽  
Assembly Behavior ◽  
Poly Ethylene

Herein, a novel amphiphilic diblock copolymer consisting of isotactic polystyrene and 1,4-trans-polybutadiene-graft-poly(ethylene oxide) was synthesized and its self-assembly behavior was investigated.

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