Synthesis and characterization of novel liquid crystalline polymers containing cholesteryl pendant groups

Liu, Jui-Hsiang; Hsieh, Feng Ming

doi:10.1016/j.matchemphys.2009.08.031

Cited by 18 publications

(8 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the strong peak at 9.14° in the GO pattern is not present in the TLCPg-GO pattern, indicating that TLCP cause the GO sheets to stack more loosely. At the same time, the curve for TLCP-g-GO shows a group of sharp diffraction peaks in the 2# region of 15~30°, but no sharp peaks in the small-angle region appeared, suggesting no smectic layers [33]. All these results indicate that the TLCP-g-GO displays nematic mesophase.…”

Section: Resultsmentioning

confidence: 68%

Enhanced thermal and mechanical properties of epoxy composites by mixing thermotropic liquid crystalline epoxy grafted graphene oxide

Qi¹,

Lu²,

Xiao³

et al. 2014

Express Polym. Lett.

111

View full text Add to dashboard Cite

Abstract. Graphene oxide (GO) sheets were chemically grafted with thermotropic liquid crystalline epoxy (TLCP). Then we fabricated composites using TLCP-g-GO as reinforcing filler. The mechanical properties and thermal properties of composites were systematically investigated. It is found that the thermal and mechanical properties of the composites are enhanced effectively by the addition of fillers. For instance, the composites containing 1.0 wt% of TLCP-g-GO present impact strength of 51.43 kJ/m 2 , the tensile strength of composites increase from 55.43 to 80.85 MPa, the flexural modulus of the composites increase by more than 48%. Furthermore, the incorporation of fillers is effective to improve the glass transition temperature and thermal stability of the composites. Therefore, the presence of the TLCP-g-GO in the epoxy matrix could make epoxy not only stronger but also tougher.

show abstract

Section: Resultsmentioning

confidence: 68%

Enhanced thermal and mechanical properties of epoxy composites by mixing thermotropic liquid crystalline epoxy grafted graphene oxide

Qi¹,

Lu²,

Xiao³

et al. 2014

Express Polym. Lett.

111

View full text Add to dashboard Cite

show abstract

“…In general, liquid crystals must contain suitable polarity and spacer length at the center and terminals. The monomer 1 with an electron donating (-OC 4 H 9 ) segment as the terminal group exhibited monotropic nematic phase, which was evidenced by the clear schlieren texture observed in POM images at the temperature range of 60-44°C during the cooling cycle [16]. Figure 5 showed the DSC curves of 3 and 4 at a heating or cooling rate of 10°C/min.…”

Section: Thermal Stability and Liquid Crystalline Propertiesmentioning

confidence: 92%

“…Cu(I)Cl was first washed with acetic acid to remove any soluble oxidized species, and then filtered, washed with ethanol and dried under vacuum. The monomer of 4-butoxyphenyl-4 0 -(6-acryloyloxyhexyloxy) benzoate 1 was prepared following the literature method [16]. The macroinitiator PFS 2 was prepared according to the literature procedure [17] and exhibited a number molecular weight (M n ) of 8,900 Dalton and a polydispersity (PDI) of 2.41.…”

Section: Materials and Measurementsmentioning

confidence: 99%

“…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]. Subsequently, ATRP procedure of monomer 1 initiated by PFS 2 provided LC polymer brushes 3.…”

Section: Synthesis and Characterization Of The Polymer Brushmentioning

confidence: 99%

See 1 more Smart Citation

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

“…Styryl has also been employed as the polymerizable moiety [194]. These monomers are mostly polymerized by free-radical polymerization [184][185][186][187][188][189][190][192][193][194] with or without comonomers. Laser-initiated polymerization [183] and photopolymerization (UV light, in cholesteric LC phase) [187] have also been reported.…”

Section: Polymerization Of Terpene-based Monomersmentioning

confidence: 99%

Synthesis of Terpene-Based Polymers

Zhao¹,

Schlaad²

2012

Advances in Polymer Science

View full text Add to dashboard Cite

Terpenes or terpenoids are a large class of diverse biological compounds derived from isoprene. Due to their abundance in nature and desirable properties, there has been great interest in producing polymers with terpenes as either functional entities or as the main constituent. Terpene-based polymers have found applications as biomedical or liquid crystalline materials and, more importantly, have greatly contributed to the concept of sustainable polymer chemistry. The design and preparation of terpene-based polymers have involved different chemical strategies and a wide variety of polymerization techniques, making use of the chemical functionalities in terpene molecules, e.g. (conjugated) double bonds, hydroxyl and carboxyl groups. This review describes the synthetic methodologies for terpene-based polymers, classified by the position of terpene entities in the polymer chains, i.e., main chain, terminal or central group, and pendant group.

show abstract

Synthesis and characterization of novel liquid crystalline polymers containing cholesteryl pendant groups

Cited by 18 publications

References 21 publications

Enhanced thermal and mechanical properties of epoxy composites by mixing thermotropic liquid crystalline epoxy grafted graphene oxide

Enhanced thermal and mechanical properties of epoxy composites by mixing thermotropic liquid crystalline epoxy grafted graphene oxide

Synthesis and Characterization of a Liquid Crystalline Polyferrocenylsilane Brush

Synthesis of Terpene-Based Polymers

Contact Info

Product

Resources

About