Thermal Characterization of Polymer-Dispersed Liquid Crystals by Differential Scanning Calorimetry

Liquid crystals are compounds that display order in the liquid state above the melting temperature and below the mesogenic isotropic temperature. Polymer-dispersed liquid crystals (PDLCs) are composite materials in which liquid crystalline material is dispersed within a polymer matrix to form micron-sized droplets. The aim was to prepare several cholesteryl esters or alkoxybenzoic acid PDLCs and characterise thermal and optical properties. Differential scanning calorimetry and polarized optical microscopy were employed. The matrix polymer was a one-component UV-curable epoxy-acrylate resin. PDLCs were formed through entropy controlled phase separation resulting from UV-initiated crosslinking. The liquid crystals, both as mesogenic moieties and as dispersed droplets, exhibited various textures according to their molecular order and orientation. These textures formed in constrained regions separated by phase boundaries that occurred at temperatures characteristic of each liquid crystal used. The PDLC phase transitions occurred at temperatures lower than those exhibited by the mesogenic components in the neat state.

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Electro-Optical Characterization of E48:PVP Polymer Dispersed Liquid Crystals

Molecular Crystals and Liquid Crystals Science and Technology Section A Molecular Crystals and Liquid Crystals ◽

10.1080/10587250108025308 ◽

2001 ◽

Vol 365 (1) ◽

pp. 305-311

Author(s):

Cheryll Lei E. Mahinay ◽

Claire M. Macale ◽

Fairland F. Amos ◽

Zenaida B. Domingo ◽

Leonorina G. Cada

Keyword(s):

Liquid Crystals ◽

Optical Characterization ◽

Polymer Dispersed Liquid Crystals ◽

Polymer Dispersed

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Thermal characterization of wood of nine European tree species: thermogravimetry and differential scanning calorimetry in an air atmosphere

European Journal of Wood and Wood Products ◽

10.1007/s00107-021-01763-6 ◽

2021 ◽

Author(s):

Olga Shapchenkova ◽

Sergei Loskutov ◽

Antonina Aniskina ◽

Zoltán Börcsök ◽

Zoltán Pásztory

Keyword(s):

Differential Scanning Calorimetry ◽

Tree Species ◽

Thermal Characterization ◽

Scanning Calorimetry ◽

Air Atmosphere

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THERMAL CHARACTERIZATION OF THE FAVELONE DERIVATIVES (CNIDOSCOLUS QUERCIFOLIUS) BY THERMOGRAVIMETRY AND DIFFERENTIAL SCANNING CALORIMETRY

Periódico Tchê Química ◽

10.52571/ptq.v3.n05.2006.janeiro/1_pgs_8_20.pdf ◽

2006 ◽

Vol 05 (3) ◽

pp. 8-20

Author(s):

José Carlos Oliveira SANTOS ◽

Lionete Dantas NUNES ◽

Sylvia Berenice NÓBREGA ◽

Dantas José Pires PUZINSKI ◽

Antonio Gouveia SOUZA

Keyword(s):

Differential Scanning Calorimetry ◽

Arid Region ◽

Agricultural Practices ◽

Thermal Characterization ◽

Northeastern Brazil ◽

Scanning Calorimetry ◽

Semi Arid Region ◽

Derivatives Of ◽

Semi Arid

A thermal analysis has been applied to characterization of food and food products. Taking into account the problems of desertification and agricultural practices able to provide income to the population at the semi-arid region of Northeastern Brazil, this work presents the results of the chemical, thermal and kinetic characterization by thermogravimetry and differential scanning calorimetry of the seed derivatives of favelone (cnidoscolus quercifolius), aiming at the application of these materials as an alternative of food source for animals and for the human population at this brazilian region.

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