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Hurduc, Nicolae; Creanga, Adina; Pokol, Gy.; Novák, Cs.; Scutaru, Dan; Alazaroaie, Silvia

doi:10.1023/a:1022268606503

Cited by 26 publications

(8 citation statements)

References 9 publications

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“…Furthermore, it plays a crucial role in thermotropic materials due to the liquid crystal ordering that occurs in a certain temperature range. There are several publications on the thermal stability of the polymeric liquid crystals [69][70][71][72][73][74][75]. They allow better understanding of the degradation processes due to their simpler molecular structure, and their systematic study may contribute important information [76,77].…”

Section: Ferrocene-containing Liquid Crystalline Polymersmentioning

confidence: 99%

“…With a short spacer, polymers tend to be grainy, whereas with a longer spacer they are likely to be nematic because the lengthy spacer unit allows the mesogen to move freely giving the maximum possibility for alignment to form large monodomains. Although main-chain LC polymers with ferrocene in the backbone are common [71], these are limited to materials where the ferrocene units are sufficiently far apart precluding the exploitation of cooperative interactions between the iron atoms. Poly(ferrocenylsilane)s are an interesting class of polymers based on transition metals [85].…”

Section: Ferrocene Moieties In the Backbone Of Liquid Crystalline Polmentioning

confidence: 99%

“…26). Generally, most of the LC ferrocenes have complicated structures, i.e., they have three aromatic rings in the mesogen unit [71,99], and two flexible long chains [100,101]. Such complexity sometimes prevents orderly molecular packing [102][103][104].…”

Section: Ferrocene Moieties In Side-chain Liquid Crystalline Polymersmentioning

confidence: 99%

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Organometallic Ferrocene- and Phosphorus-Containing Polymers: Synthesis and Characterization

Hussein

Asiri

2012

Designed Monomers and Polymers

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The inclusion of organometallic units into polymeric structures has attracted much attention in different fields according to the nature and behaviour of the inserted metal. Moreover, the discovery of organometallic polymers and their structural characterization initiated an explosive rebirth of organometallic chemistry. Organometallic moieties are in or pendent to the polymer backbone and examine some of the uses of the emergent metallocene polymers, and new uses are still being found for these remarkable organometallic moieties. This review gives a simple introduction to variable organometallic molecules and their characteristics. This review will focus on the syntheses and characterization of organometallic polymers, including ferrocene-and phosphorus-containing polymers. A general overview on ferrocene polymers with a special attention to ferrocene-containing liquid crystalline polymers (including a ferrocene moiety in the main chain, side-chain or dendrimers) and fullerene-ferrocene liquid crystalline polymers is presented. In addition, more details for synthesis and properties of phosphorus-containing polymers are illustrated.

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Section: Ferrocene-containing Liquid Crystalline Polymersmentioning

confidence: 99%

Section: Ferrocene Moieties In the Backbone Of Liquid Crystalline Polmentioning

confidence: 99%

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Organometallic Ferrocene- and Phosphorus-Containing Polymers: Synthesis and Characterization

Hussein

Asiri

2012

Designed Monomers and Polymers

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“…In most cases the mesophase range was quite large, being about 50 2 C or more. As all the polymers containing DHAB segments began to decompose above 250 2 C, a very careful thermogravimetric study was necessary [17][18][19]. Figure 1 presents the DSC thermograms of samples 1, 2, 3, 5 and 13.…”

Section: Aromatic Polyethers Containing Different Spacers 153mentioning

confidence: 99%

“…Previous thermogravimetric analysis has shown that compounds with DHAB : DHD composition have the lowest thermal degradation limit, very close to their isotropization temperature, which made the DSC characterization quite difficult to perform [17,18]. However, all the samples containing DHAB and DHD units (16)(17)(18)(19)(20)(21) showed liquid crystalline properties, the transition temperatures decreasing with the increase of DHD content.…”

Section: Aromatic Polyethers Containing Different Spacers 153mentioning

confidence: 99%

Liquid Crystalline Polymers. 15. Synthesis and Thermal Behavior of Some Aromatic Polyethers Containing Different Spacers

Alazaroaie¹,

Catanescu²,

Pavel

et al. 2005

High Performance Polymers

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A series of aromatic homo-and copolyethers containing 6, 7 or 8 methylenic groups as spacers are presented. The polymers were synthesized by phase-transfer catalysis and they were characterized by using 1 H-NMR, polarized light microscopy, differential scanning calorimetry and thermogravimetric analyses. All copolymers have low molecular weight, situated within the oligomer domain. They have high transition temperatures except for the case when bent or semi-flexible bisphenols were used as comonomers. Only 4,4 1 -dihydroxyazobenzene-based polymers showed liquid crystalline properties with a mesophase range over 50 2 C, and with the clearing temperatures situated near their thermal decomposition limit. The insertion of kink or flexible bisphenols was not favorable to mesophase formation (it induced too high a disorder in the system), but it lowered the transition temperatures, as expected. Few exceptions occurred in the case of bisphenol A and 4,4 1 -dihydroxybenzophenone. The biphasic nature of these copolyethers is most probably due to both the polydispersity and the chemical heterogeneity of the samples. Some of the semi-crystalline copolymers may exhibit virtual mesophase that can be uncovered by increasing their molecular weight or by raising the free energy of the isotropic liquid state.

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Role of Mass Spectrometry in the Elucidation of Thermal Degradation Mechanisms in Polymeric Materials

Rizzarelli¹,

Carroccio²

2015

Reactions and Mechanisms in Thermal Analysis of Advanced Materials

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Cited by 26 publications

References 9 publications

Organometallic Ferrocene- and Phosphorus-Containing Polymers: Synthesis and Characterization

Organometallic Ferrocene- and Phosphorus-Containing Polymers: Synthesis and Characterization

Liquid Crystalline Polymers. 15. Synthesis and Thermal Behavior of Some Aromatic Polyethers Containing Different Spacers

Role of Mass Spectrometry in the Elucidation of Thermal Degradation Mechanisms in Polymeric Materials

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