Reactive blending of poly(ethylene terephthalate) with a liquid crystalline copolyester and polyhydroxyether

Bruggeman, Albert; Tinnemans, A. H. A.

doi:10.1002/(sici)1097-4628(19990214)71:7<1107::aid-app9>3.3.co;2-e

Cited by 3 publications

(12 citation statements)

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“…PET without anhydride was used. The blend was prepared from solution 1. The DSC thermograms of the first and second heating runs are shown in Figure 1.…”

Section: Resultsmentioning

confidence: 99%

“…The blend components were tumble‐mixed and dried for at least 16 h in a vacuum at 120°C. In the previous article, two methods were used to produce blend fibers1; in this article, the first of these methods (method A ) was used: The different blend compositions were fed into a Collin single‐screw extruder, equipped with a four‐way Ross static mixer, containing a sequence of 10 mixing elements. The subsequent extruder zones were set at 160, 290, and 310°C.…”

Section: Methodsmentioning

confidence: 99%

“…The draw ratio was determined by the ratio of square diameters of the die and the drawn fiber: DR = d die 2 / d fiber 2 . The compatibility, morphology, tensile moduli, and tensile strengths were determined using the procedures and methods as described previously 1…”

Section: Methodsmentioning

confidence: 99%

“…Previously, it was shown that the mechanical properties of blends of poly(ethylene terephthalate) (PET), modified with a dianhydride, and a thermotropic liquid crystalline polymer (TLCP) could be improved by a factor 4 –5 by adding a small amount of a polyhydroxyether 1. The improvement was achieved due to reactions taking place between the anhydride and secondary hydroxyl groups, which changes the rheological conditions (and possibly improves the adhesion between the phases).…”

Section: Introductionmentioning

confidence: 99%

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Influence of the type of polyhydroxyether on mechanical properties of PET/TLCP/polyhydroxyether blends

Bruggeman

Tinnemans

1999

J. Appl. Polym. Sci.

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In a more elaborate article, it was described that blends of poly(ethylene terephthalate) (PET), a liquid crystalline copolyester, and small amounts of a liquid crystalline polyhydroxyether showed an increase in tensile modulus and strength compared to the blends without polyhydroxyether. The results were obtained using a polyhydroxyether composed of 75 mol % biphenyl and 25 mol % phenyl units. In this article, the use of two other types of polyhydroxyether is described, one based on the ␣-methylstilbene unit and the other based on bisphenol A. Addition of either of these polyhydroxyethers to the PET/thermotropic liquid crystalline polymer (TLCP) blends increased the tensile modulus and strength of extruded fibers in a similar way as upon addition of the liquid crystalline polyhydroxyether. Improvement of the viscosity ratio and thereby improvement of the fibril formation, by reactions of the functional hydroxyl side groups in the polyhydroxyethers, appears to be the most important factor for the improvement of the mechanical properties.

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“…PET without anhydride was used. The blend was prepared from solution 1. The DSC thermograms of the first and second heating runs are shown in Figure 1.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of the type of polyhydroxyether on mechanical properties of PET/TLCP/polyhydroxyether blends

Bruggeman

Tinnemans

1999

J. Appl. Polym. Sci.

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“…In the case of poor compatibility between the components, compatibilizers are also used to obtain polymer blends that reduce the interfacial energy, resulting in finer dispersion of blend components and enhanced mechanical properties to the blends. References are available where compatibilization of polymer blends was achieved using graft polymers,6, 7 in situ compatibilization,8–14 copolymerization reaction,15 interchange reaction,16 and similar techniques.…”

Section: Introductionmentioning

confidence: 99%

Disulfide Bond Creates a Small Connecting Loop in Aminoxy Peptide Backbone

Yang

Liu

Jiao

et al. 2008

Chemistry A European J

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Reactive blending of polyamide 6,6 and vectra A, 2

Castellano

Nebbia

Turturro

et al. 2002

Macromol. Chem. Phys.

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In a previous paper Nylon 6,6/Vectra A blends have been prepared and investigated; in particular, our attention has been focused on Nylon 6,6 modifications due to interchange reactions that occur in the melt, as a function of mixing conditions and blend compositions, and improve the compatibility of the blend. The results indicated that only a small amount of copolymeric species form because of the low reaction kinetics and unfavorable physical and rheological aspects. In order to overcome these limits, a further research on Nylon 6,6/Vectra A blends has been carried out to test the role of modified processing conditions in the presence of a reactive additive able to improve the extent of reactions between blend components and the melt viscosity of the polyamide matrix. The potential of a Nylon 6,6 sample with predominant NH2 end‐groups on its reactive blending with Vectra with or without the reactive third component has been investigated. Nylon and Vectra, combined in weight ratios between 90/10 and 50/50, were subjected to reactive blending with different methods (a laboratory Pyrex reactor, a single‐screw extruder, and a Brabender mixer). Neat Nylon samples have been also investigated as reference materials. Thermal and morphological analyses were carried out on the blends. The soluble Nylon 6,6‐rich fraction of each blend was separated from the insoluble Vectra‐rich one, and both were used for spectroscopic characterizations; mixed Nylon‐Vectra copolymers have been recognized in both the soluble and insoluble fractions of the blends.

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Reactive blending of poly(ethylene terephthalate) with a liquid crystalline copolyester and polyhydroxyether

Cited by 3 publications

References 0 publications

Influence of the type of polyhydroxyether on mechanical properties of PET/TLCP/polyhydroxyether blends

Influence of the type of polyhydroxyether on mechanical properties of PET/TLCP/polyhydroxyether blends

Disulfide Bond Creates a Small Connecting Loop in Aminoxy Peptide Backbone

Reactive blending of polyamide 6,6 and vectra A, 2

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