Novel liquid crystalline resins based on MQ siloxanes

Ganicz, Tomasz; Pakuła, Tadeusz; Stańczyk, Włodzimierz A.

doi:10.1016/j.jorganchem.2006.07.043

Cited by 14 publications

(8 citation statements)

References 13 publications

(14 reference statements)

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“…The presence of diffraction peaks in the low‐angle region without a previous thermal treatment is indicative of a remanent smectic mesophase. It is known that in certain cases such peaks can be observed at room temperature because of the thermal history of the sample 21–25. As can be seen in Figure 7, besides the crystalline nature of the sample CH2, a peak corresponding to a d ‐spacing of about 19 Å was registered in the low‐angle region, suggesting a layered ordering of a smectic mesophase.…”

Section: Resultsmentioning

confidence: 91%

Siloxane‐containing liquid‐crystalline supramolecular polymers: Preparation and study of thermotropic behavior

Racleş¹,

Cazacu²

2008

J of Applied Polymer Sci

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New hydrogen-bonding supramolecular polymers were obtained from 4,4 0 -bipyridine and different silicon-containing diacids. The formation and thermal stability of these complexes were verified with Fourier transform infrared spectroscopy following the specific absorption bands at 1950 and 2450 cm À1 . Their thermotropic behavior was investigated with polarizing optical microscopy and differential scanning calorimetry. All the obtained supramolecular compounds were liquid crystals within mesophase ranges that depended on the structure of the starting siloxane/silane diacid.

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Section: Resultsmentioning

confidence: 91%

Siloxane‐containing liquid‐crystalline supramolecular polymers: Preparation and study of thermotropic behavior

Racleş¹,

Cazacu²

2008

J of Applied Polymer Sci

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“…Currently, the most widely used method of obtaining MQ copolymers is co-condensation of Si(OC 2 H 5 ) 4 or a product of its partial hydrolysis and hexaorganodisiloxane in the presence of HCl and alcohol at temperatures from 0 °C to 90 °C [25,28,32,33,34,35] (Scheme 1). …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Properties of MQ Copolymers: Current State of Knowledge

2017

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In this review, we discuss currently available studies on the synthesis and properties of MQ copolymers. The data on methods of producing hydrolytic and heterofunctional polycondensation of functional organosilanes as well as the obtaining MQ copolymers based on silicic acids and nature silicates are considered. The ratio of M and Q monomers and the production method determine the structure of MQ copolymers and, accordingly, their physicochemical characteristics. It is shown that the most successful synthetic approach is a polycondensation of organoalkoxysilanes in the medium of anhydrous acetic acid, which reduces the differences in reactivity of M and Q monomers and leads to obtaining a product with uniform composition in all fractions, with full absence of residual alkoxy-groups. The current concept of MQ copolymers is that of organo-inorganic hybrid systems with nanosized crosslinked inorganic regions limited by triorganosilyl groups and containing residual hydroxyl groups. The systems can be considered as a peculiar molecular composites consisting of separate parts that play the role of a polymer matrix, a plasticizer, and a nanosized filler.

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“…The importance of the length of the flexible spacer is clearly demonstrated (entry V, Table 1 ). The hydrosilylation reaction was also used extensively in the synthesis of highly branched star, comb-like dendritic systems [ 29 , 30 ], and polymers with increased density of side chain mesogens [ 31 ].…”

Section: Synthetic Methodsmentioning

confidence: 99%

Side-chain Liquid Crystal Polymers (SCLCP): Methods and Materials. An Overview

Ganicz

Stańczyk

2009

Materials

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This review focuses on recent developments in the chemistry of side chain liquid crystal polymers. It concentrates on current trends in synthetic methods and novel, well defined structures, supramolecular arrangements, properties, and applications. The review covers literature published in this century, apart from some areas, such as dendritic and elastomeric systems, which have been recently reviewed.

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Novel liquid crystalline resins based on MQ siloxanes

Cited by 14 publications

References 13 publications

Siloxane‐containing liquid‐crystalline supramolecular polymers: Preparation and study of thermotropic behavior

Siloxane‐containing liquid‐crystalline supramolecular polymers: Preparation and study of thermotropic behavior

Synthesis and Properties of MQ Copolymers: Current State of Knowledge

Side-chain Liquid Crystal Polymers (SCLCP): Methods and Materials. An Overview

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