In recent years, the commercial availability of diacrylate reactive mesogens such as R6M RM82 has been a key driver in the Liquid crystalline elastomer (LCE) field, providing a gratifying alternative considering a library of benign diacrylate reactions.
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The basic information of R6M RM82
R6M RM82 CAS NO.125248-71-7
Product Name: 2-methyl-1,4-phenylene bis(4-((6-(acryloyloxy)hexyl)oxy)benzoate)
Molecular Formula: C39H44O10
Diacrylate reactive mesogenic monomer, R6M RM82, is a type of main-chain liquid crystal polymer with photosensitive properties. It also functions as an LCD monomer, RM material, and electronic chemical.
What are the applications of R6M RM82?
LCEs are anisotropic, soft materials that undergo significant shape changes when exposed to various stimuli. Mesogenic diacrylates (R6M RM82 and RM257 CAS NO.174063-87-7) can be combined with a dithiol chain-transfer agent to create LCE films. Liquid crystal cells are filled with a nematic LC mixture containing R6M RM82/RM257 in a 20/80 ratio. Furthermore, this mixture is required for the creation of cholesteric layers.
Moreover, LCEs have been identified as one of the most promising material concepts for artificial muscles. Actuation of LCEs, on the other hand, necessitates macroscopic alignment of the liquid-crystalline orientation in the rubbery network, which faces difficulties in materials chemistry and processing. During the previous three decades, a two-stage curing approach has been the most popular.
Despite its many achievements, the process is difficult to implement in practice and necessitates delicate hands-on experience dealing with the inherent fragility of intermediate gels after the first crosslinking stage. A robust monodomain LCE manufacturing approach based on the amine-acrylate aza-Michael addition was developed by researchers, involving two widely and commercially available components with no catalyst.
This method utilizes R6M RM82. The process is based on the substantial kinetic difference in hydrogen addition in primary amines to acrylates, which provides a sufficient gap between two stages of curing and enables versatile mechanical alignment procedures for monodomain LCE production in both liquid and gel states. Significantly, the mechanically strong network, which aids processability at the partial-crosslinking step, is facilitated throughout the process by chemically produced hydrogen bonding, as a by-product of hydrogen addition.
This straightforward two-component kit-like fabrication is beneficial to researchers looking for a practical and dependable soft actuator manufacturing approach from a variety of domains.
The self-limiting thiol-acrylate Michael addition between R6M RM82 and an isotropic dithiol (EDDT) result in LC oligomers.
Moreover, R6M RM82 copolymerizes with a photopolymer (NOA65) to create birefringence in polymer fibers.
A novel hydrogen-bridged cholesteric liquid crystal (CLC) polymer network with porosity was presented by researchers. This type of substance is used to identify methanol from ethanol. The reflected hues of the cholesteric polymer networks are varied upon ingestion of the alcohol solutions with different ratios of methanol/ethanol due to the variance of molecular affinities between ethanol and methanol with the hydrogen-bridged cholesteric polymer networks.
Furthermore, the monomer composition was changed to achieve distinct sensitivities to various alcohol concentrations and methanol/ethanol ratios. The capacity to differentiate between methanol and ethanol can be improved by reducing cross-link density and increasing the amount of alkyloxy benzoic acid in polymer networks.
R6M RM82 and RM105 (CAS NO.82200-53-1) were utilized for this study. Because both molecules are not alcohol-responsive reactive mesogens, they can preserve the polymer’s integrity. R6M RM82 also gives CLC films a higher cross-link density and stronger polymer integrity.
The characteristics of R6M RM82
The liquid crystal monomer is usually in the column phase, and it possesses below properties:
(1) The molecule has a stick structure with a 4:1 length ratio.
(2) The molecular ends contain polar or polarizable groups to keep the molecules in an orderly orientation.
(3) The molecule’s long axis is flexible but somewhat stiff.
How to form the R6M RM82
According to the classification standard of the China petroleum and chemical industry association, liquid crystal intermediates and liquid crystal monomers are produced by combining several basic chemical raw materials for a variety of chemical reaction conversions and belong to the fine chemical sector in the creation of various specialized chemical products.
The related chemicals-
4-(3-(acryloyloxy)propoxy)benzoic acid CAS NO.245349-46-6
4-((6-(acryloyloxy)hexyl)oxy)benzoic acid CAS NO.83883-26-5
6-(4-hydroxyphenoxy)hexyl acrylate CAS NO.161841-12-9
(4-hydroxyphenyl)boronic acid CAS NO.71597-85-8
3-(4-bromophenyl)propanal CAS NO.80793-25-5
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