Synthesis and characterization of star-shaped block copolymers with polyhedral oligomeric silsesquioxane (POSS)core via ATRP

Wang, Wenping; Fei, Ming; Jie, Xiaoxiao; Wang, Peng; Cao, Hengming; Yu, Jie

doi:10.1007/s00289-010-0249-2

Cited by 29 publications

(19 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…And then the star-shaped POSS-graft-LCP was successfully prepared by using POSS-[CH 2 CH 2 CH 2 Cl] 8 as the initiator for the ATRP technique since it has been used to initiate ATRP procedure for preparing star-shaped poly(methyl methacrylate) with the POSS as a core. [45] However, the yield of polymerisation is rather low in comparison to the literature reported ATRP method. [46,47] For comparison, LLCP was also prepared by free radical polymerisation with AIBN as the initiator.…”

Section: Synthesis and Characterisation Of Monomer Liquid Crystallinmentioning

confidence: 94%

Synthesis and characterisation of star-shaped liquid crystalline polymer with a POSS core

2015

View full text Add to dashboard Cite

The star-shaped POSS-graft-LCP with POSS as the core and liquid crystal polymer, poly{6-(4ʹ-octyloxyphenyl-4″-benzoyl)hexyl acrylate}, as arms was prepared by atom transfer radical polymerisation technique using octa(3-chloropropyl) polyhedral oligomeric silsesquioxane [POSS-(CH 2 CH 2 CH 2 Cl) 8 ] as initiator. For comparison, the linear liquid crystal polymer, poly{6-(4ʹ-octyloxyphenyl-4″-benzoyl)hexyl acrylate} (LLCP), was obtained by conventional radical polymerisation. Both liquid crystal polymers were characterised by FT-IR, 1 H NMR, 13 C NMR, gel permeation chromatography, thermogravimetric analysis, differential scanning calorimetry, polarised optical microscopy and X-ray diffraction analysis. The liquid crystal phase behaviour research demonstrated that both liquid crystal polymers were reversible thermotropic nematic liquid crystal materials. The number of polymerisation degree of every arm attached on POSS in POSS-graft-LCP impacted greatly on the liquid crystal properties and only a small one was necessary for it to exhibit a broad liquid crystal range. Results further demonstrated that the special star-shaped topology of POSS and the eight arms attached helped POSS-graft-LCP form and stabilise liquid crystal phase easily. This research may further expand the way to star-shaped LCPs by employing a variety of (meth)acrylate and other vinyl liquid crystalline monomers.

show abstract

Section: Synthesis and Characterisation Of Monomer Liquid Crystallinmentioning

confidence: 94%

Synthesis and characterisation of star-shaped liquid crystalline polymer with a POSS core

2015

View full text Add to dashboard Cite

show abstract

“…Schmalz and Reinicke designed to replace the terminal halogen of the ATRP-derived polymer with azide and the subsequent click reaction by alkynyl compounds, which confirmed effectively. 29 In this article, POSS-(Cl) 8 with the ability to initiate polymerizations [30][31][32] was firstly synthesized by hydrolysis and condensation of 3-chloropropyl trimethoxysilane as reported. 33 Using it as ATRP initiator, star-shaped chlorine-terminated POSS-methacrylate polymers (POSS-(PXMA-Cl) 8 ) were synthesized.…”

Section: 12mentioning

confidence: 99%

“…34 POSS-(PXMA-Cl) 8 (0.15 mmol), THF (15 mL), and NaN 3 (0.325 g) were added into a 100-mL round-bottomed flask, and the reaction mixture was allowed to stir at 30 C for 24 h. Then, the solution was concentrated and precipitated by pouring into a large amount of deionized water. The collected product was further dried at 40 C in a vacuum oven for 24 h.…”

Section: Synthesis Of Poss-(cl)mentioning

confidence: 99%

Star‐shaped POSS–methacrylate copolymers with phenyl–triazole as terminal groups, synthesis, and the pyrolysis analysis

Qiang

Chen

et al. 2014

J of Applied Polymer Sci

View full text Add to dashboard Cite

Star-shaped polyhedral oligomeric silsesquioxane (POSS)-methacrylate hybrid copolymers with phenyl-triazole as terminal groups had been designed and synthesized via sequential atom transfer radical polymerization (ATRP), azidation, and phenylacetylene-terminated procedures, and the hybrid copolymers here could be denoted as POSS-(PXMA-Pytl) 8 , where X can be M, B, L, and S, represented four different methacrylate monomers, such as methacrylate (MMA), butyl methacrylate (BMA), lauryl methacrylate (LMA), and stearyl methacrylate (SMA), respectively. Thermal gravimetric analysis (TGA) and in situ Fourier transform infrared spectroscopy (FTIR) were applied for studying the thermal stability and degradation mechanism, and it was found that all of the POSS-(PXMA-Cl) 8 and POSS-(PXMA-Pytl) 8 copolymers exhibited excellent thermal stabilities, which had great potential in heat-resistant material application. Different tendencies of decomposition temperatures at 5% and 10% weight loss (T 5 and T 10 ) dependent on the side-chain length and terminal group species were investigated respectively. The longer alkyl side chains of the monomers, the lower thermal stabilities, and enhanced T 5 and T 10 were also shown with the introduction of phenyl-triazole groups instead of chlorine groups.

show abstract

“…Indeed, PFS was used as the main chain to prepare side chain liquid polymers and their liquid crystalline properties were extensively studied [27][28][29][30]. Since the chloropropenylsilyl has been used as an ATRP initiator [31,32], PFS 2 with a chloropropenyl group on silicon was prepared via a ring-opening polymerization of the corresponding siliconbridged [1] ferrocenophanes following the literature method [17]. For a convenient comparative analysis, an acrylate functionalized phenyl benzoate mesogen 1, 4-butoxyphenyl-4 0 -(6-acryloyloxyhexyloxy) benzoate, was used as the monomer for ATRP procedure, since the corresponding side-chain LC polymer 4, has been reported in the literature [16,18].…”

Section: Synthesis and Characterization Of The Polymer Brushmentioning

confidence: 99%

Synthesis and Characterization of a Liquid Crystalline Polyferrocenylsilane Brush

Xiong

Wang

Qin

et al. 2014

J Inorg Organomet Polym

View full text Add to dashboard Cite

A grafted side chain liquid crystalline polymer brush with poly(ferrocenylsilane) as the main chain and poly{6-(4 0 -butyloxyphenyl 4 00 -benzoyl)hexyl acrylate} as side chain has been synthesized by atom transfer radical polymerization (ATRP) technique. For comparison, a linear liquid crystalline polymer, poly{6-(4 0 -butyloxyphenyl-4 0 -benzoyl)hexyl acrylate}, was prepared by conventional radical polymerization method. Both of them were characterized by NMR, FT-IR, GPC and TGA. Their liquid crystalline properties have been investigated by means of differential scanning calorimetry, polarizing mciroscope and X-ray scattering. The liquid crystal phase behavior research demonstrated that both of them were reversible thermotropic nematic phase in the high temperature region and smectic A phase in the low temperature region. In comparison with linear liquid crystalline polymer, liquid crystalline polyferrocenylsilane brush exhibited the lower glass transition temperature (T g ) and clearing point (T NI ). Results showed that the brush architecture made the alignment of the mesogens more difficult than those in its monomer and linear polymer.

show abstract

Synthesis and characterization of star-shaped block copolymers with polyhedral oligomeric silsesquioxane (POSS)core via ATRP

Cited by 29 publications

References 24 publications

Synthesis and characterisation of star-shaped liquid crystalline polymer with a POSS core

Synthesis and characterisation of star-shaped liquid crystalline polymer with a POSS core

Star‐shaped POSS–methacrylate copolymers with phenyl–triazole as terminal groups, synthesis, and the pyrolysis analysis

Synthesis and Characterization of a Liquid Crystalline Polyferrocenylsilane Brush

Contact Info

Product

Resources

About