Polyesters

Pilati, Francesco

doi:10.1016/b978-0-08-096701-1.00158-0

Cited by 35 publications

(22 citation statements)

References 270 publications

(74 reference statements)

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“…The 1 H NMR spectrum (figure 1) gave only very small indications of known side reactions like diethylene glycol ether (DEGE) repeating units or formation of COOH groups, as discussed in detail in Pilati [11]. A concentration of 1 to 2 mol.% DEGE units per repeating PET unit can be estimated from the 1 H NMR spectrum (using the intensities of the signal at 4.09 ppm for 4H of DEGE compared to that of 4H of repeating PET units at 4.77 ppm, see figure 1(a)).…”

Section: Polymer Synthesis Resultsmentioning

confidence: 98%

In situ Synthesis of Poly(ethylene terephthalate)/layered Silicate Nanocomposites by Polycondensation

Pospiech

Korwitz

Komber

et al. 2007

High Performance Polymers

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The goal of the work presented here was to develop nanocomposites consisting of layered silicates and poly(ethylene terephthalate) (PET). Two nanocomposite preparation methods were compared: first, the usual melt compounding technique, and second, in-situ synthesis of PET in presence of different types of layered silicates. Montmorillonite (MMT) without and with organophilic modification was employed as layered silicate. In most cases, PETs with acceptable properties (molecular weight and discoloration) were synthesized in presence of different MMTs although the molecular weights of the in-situ PETs were lower than the control sample. These materials were used as masterbatch for PET nanocomposites with 5 wt.% inorganic content. The exfoliation in both types of nanocomposites was not complete, but they showed a good distribution of clay within the polymer matrix.

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Section: Polymer Synthesis Resultsmentioning

confidence: 98%

In situ Synthesis of Poly(ethylene terephthalate)/layered Silicate Nanocomposites by Polycondensation

Pospiech

Korwitz

Komber

et al. 2007

High Performance Polymers

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“…The kinetics and mechanisms of diacid-diol polyesterifications and the conditions in which kinetic studies can be discussed in terms of reaction mechanisms have been reviewed. 2,217 REACTIONS WITHOUT ADDED CATALYST Flory 225 -227 showed that both mono-and polyesterifications are third-order processes similar to the processes found for solution esterifications and that the reactivity of hydroxyl and carboxyl endgroups does not depend on chain length. These early findings have been confirmed by many other studies, 228 -231 and order 2 in acid and order 1 in alcohol were confirmed in polymeric medium.…”

Section: Reaction Mechanisms and Catalysismentioning

confidence: 89%

Polyesters

Fradet

Tessier

2003

Synthetic Methods in Step‐Growth Polymers

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“…A maximum temperature of 200 8C was chosen to avoid the possibility of chain scissions. [27] When no further evaporation of diol was observed, reactions were terminated. Table 4 summarizes the results of the polycondensations.…”

Section: Transesterification Polycondensationmentioning

confidence: 99%