State conditions of polymer and monomer with liquid crystalline phases

Cser, F.; Nyitrai, K.; Hardy, G.

doi:10.1002/polc.5070610104

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…The transition heats and temperatures resulting from reaction are shown in Table IV. Representative DSC thermograms, as a function of reaction time, are illustrated in Figures [10][11][12] for the ~75 wt % composition for each initial molecular weight of BPE/I/N20. The reaction temperature of 220 °C is an effective annealing tempera- " Glass-transition temperature estimated by DSC (10 °C/min).…”

Section: Resultsmentioning

confidence: 99%

Novel approach for the processing of thermotropic liquid-crystal polymers. 1. Thermodynamics and solid-state transesterification

George¹,

Porter²

1986

Macromolecules

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Section: Resultsmentioning

confidence: 99%

Novel approach for the processing of thermotropic liquid-crystal polymers. 1. Thermodynamics and solid-state transesterification

George¹,

Porter²

1986

Macromolecules

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“…34 The structure of the synthesized polymers was confirmed by FT-IR and NMR spectroscopy. Investigation of the obtained polymer by means of FT-IR spectroscopy indicated that the substitution reaction of P1 with the heterocyclic amines (2 -4) could be achieved.…”

Section: Structural Characterizationmentioning

confidence: 97%

Chemical Modification of Poly(epichlorohydrin) Using Montmorillonite Clay

Bekkar

Belbachir

2009

Chin. J. Chem.

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Cationic ring opening polymerization of epichlorohydrin (1) and acetic anhydride in the presence of Maghnite-H (Mag-H ＋ ) as a catalyst afforded, ω-diacetylated poly(epichlorohydrin) (P1) in a moderate yield and molecular weight without formation of side products and degradation. P1 was chemically modified with morpholine (2), piperidine (3) and pyrrolidine (4) into the corresponding new functional poly(epichlorohydrin)s (P2-P4) in a moderate reaction conversion . The conversion of P1 into P2-P4 was confirmed by using FTIR and NMR spectroscopy and the yield was calculated from the elemental analysis data according to the mole fraction concept. The obtained functional polymers were further characterized by thermal analysis which showed a substantial increase of the glass transition temperature (T g ). Thus, the chemical modification of α,ω-acetylated PECH using Mag-H ＋ offers a simple method for obtaining functional polymers. Mag-H ＋ is a montmorillonite sheet silicate clay exchanged with proton.

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“…Different smectic states corresponding to folded chains as well as nematic and cholesteric structures of polymers prepared from mesogenic compounds connected with flexible chain segments were identified by miscibility investigations (24,37). The results of miscibility investigations were negative for polymers containing mesogenic groups in the side chains connected directly to the main chain (9)(10)(11)16). With mesogenic side chains connected to the main chain by flexible chains, called a "spacer" (6,14^1-23,44,46,47pi), smectic state polymers were observed.…”

Section: Introductionmentioning

confidence: 99%