<i>In situ</i> polymer/polymer composites from poly(ethylene terephthalate), polyamide-6, and polyamide-66 blends

Schultz, J. M.; Петрович, Сазанов Вячеслав; Georgiev, G.; Fakirov, S.; Friedrich, K.

doi:10.1002/(sici)1097-4628(19980124)67:4<723::aid-app15>3.0.co;2-s

Cited by 30 publications

(8 citation statements)

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“…Blends of condensation polymers such as polyesters and polyamides and in general of polymers bearing reactive functional groups may yield reactions of chemical exchange when they are mixed in the molten state, leading to the formation of block, segmented, or random copolymers. − …”

Section: Introductionmentioning

confidence: 99%

“…Traditionally, instead, workers have addressed the issue of reactive blending considering mainly the inner functional groups of the homopolymers repeat units, often forgetting about the role of reactive end groups. − …”

Section: Introductionmentioning

confidence: 99%

“…Nylon-6 (Ny6) and poly(butylene terephthalate) (PBT) lead to incompatible blends in the melt, and several workers have investigated several aspects related to the processing, compatibilization, morphology, and mechanical properties of these blends. − However, little attention has been paid to the role of chain ends in this exchange reaction.…”

Section: Introductionmentioning

confidence: 99%

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Essential Role of Chain Ends in the Ny6/PBT Exchange. A Combined NMR and MALDI Approach

Samperi¹,

Montaudo²,

Puglisi³

et al. 2003

Macromolecules

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A combination of NMR and MALDI was found to be a suitable tool to study the exchange reactions that occur during the melt mixing of Nylon-6 and poly(butylene terephthalate) (Ny6/PBT) blends. The results reveal the essential role of carboxyl end groups in the exchange reaction, and allow drawing a detailed mechanism for this reaction. Using Ny6 and PBT samples bearing specific reactive end groups, it was demonstrated that only the carboxyl end groups of PBT and of Ny6 are able to react in the initially biphasic Ny6/PBT blends, so that an outer-inner exchange takes place (Scheme 3). The composition of the copoly(esteramide) obtained at 260 °C in the exchange of Ny6/PBT shows a higher amount of Ny6 units with respect to the initial blend composition and a high value of the Ny6 average sequence length. However, the composition of the copoly(esteramide) obtained at 280 °C was instead found to be equal to the feed composition (50/50), with a random distribution of average sequence lengths. The results obtained in the present work can be reconciled within the overall model of exchange reaction occurring through active chain ends.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Essential Role of Chain Ends in the Ny6/PBT Exchange. A Combined NMR and MALDI Approach

Samperi¹,

Montaudo²,

Puglisi³

et al. 2003

Macromolecules

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“…Furthermore, we could not detect any polyester−polyamide copolymer formation through an ester−amide interchange reaction, which is typically observed in the catalyzed melt processes of polyesters and polyamides 6d…”

Section: Resultsmentioning

confidence: 77%

“…The ultimate purpose of our research is to find new oligomeric LC compounds with flexible spacers attached to the polymer as a substituent which improves the interaction between aliphatic and aromatic polymers. In this paper, we have concentrated on studies of adhesion between various LC oligomers and aliphatic PA 11 and the ability of oligomeric LC compounds to enhance the flexural properties of the polyamide …”

Section: Introductionmentioning

confidence: 99%

Unexpected Strengthening of Polyamide 11 with Liquid Crystalline Oligomers of 2-Alkoxy-4-hydroxybenzoic Acids. 1

1998

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Novel liquid crystalline (LC) oligomers of 2-alkoxy-4-hydroxybenzoic acids (5a−d) containing flexible side chains were produced, and their compatibilities with polyamide 11 (PA 11) were investigated. DSC and FTIR studies revealed variable interfacial adhesion between blended compounds. They indicated that oligomers with short or medium long alkoxy substituents (5a−c) have adhesion to PA 11 while the interactions between oligomers of 4-hydroxybenzoic acid (5e) or 2-octadecanyloxy-4-hydroxybenzoic acid (5d) and PA 11 were poor. FTIR spectra proved that oligomeric structures could self-associate and affect on the final mechanical properties of the polyamide. Strength of PA 11 in a three point bending test was increased by addition of only 1% of LC oligomers 5a−e to the matrix.

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X‐Ray Scattering Studies on Multiphasic Polymer Systems

Denchev¹,

Viana²

2011

Handbook of Multiphase Polymer Systems

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At present, multiphase and multicomponent materials such as polymer alloys, blends, and composites consume over 80 wt% of all commercially-produced resins. The increase of this particular segment of the plastics industry is about three times faster than of the industry as a whole. The reason is that the modification by blending may improve significantly the resins' mechanical performance and processability, being at the same time cost effective. Those few resins that are used without adding of other components are most frequently semicrystalline, i.e. they already have a multiphase structure that makes other modification less urgent [1].Recently, a large window has opened for new structural applications of the multicomponent polymer systems with the advent of nanoscale filled polymer composites. Changing the type, size, shape, volume fraction, interface, and degree of dispersion or aggregation of the nanofillers enables a great amount of unique combinations of properties with high potential for successful commercial development [2].In technical literature the terms 'phase' and 'component' are often used interchangeably.In thermodynamics, however, a clear distinction is made. Thus, a phase is defined as a chemically and physically uniform quantity of matter that can be separated mechanically from a nonhomogeneous mixture. Hence, multiphasic polymer systems would comprise at least two different phases, e.g. semicrystalline single polymers featuring amorphous and crystalline phases or polymorphic polymers containing different concomitant crystalline phases. Many polymer systems with industrial importance such as blends, colloidal polymers, polymer composites/ filled polymers, etc. comprise two or more chemically distinct components, each one of them being able to contain various phases as well. These components may have different sizes, with microscopic to nanoscopic blocks being present.

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In situ polymer/polymer composites from poly(ethylene terephthalate), polyamide-6, and polyamide-66 blends

Cited by 30 publications

References 0 publications

Essential Role of Chain Ends in the Ny6/PBT Exchange. A Combined NMR and MALDI Approach

Essential Role of Chain Ends in the Ny6/PBT Exchange. A Combined NMR and MALDI Approach

Unexpected Strengthening of Polyamide 11 with Liquid Crystalline Oligomers of 2-Alkoxy-4-hydroxybenzoic Acids. 1

X‐Ray Scattering Studies on Multiphasic Polymer Systems

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