Thermal, morphological and rheological characterization of poly(acrylic acid-g-styrene) amphiphilic graft copolymers

Fuente, José Luis de la; Wilhelm, Manfred; Spiess, Hans Wolfgang; Madruga, Enrique López; Cerrada, María L.

doi:10.1016/j.polymer.2005.03.076

Cited by 38 publications

(41 citation statements)

References 44 publications

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“…Although an atactic polymer such as the PAAc-grafted backbones has to contain a low crystallinity, its contribution to the elastic modulus should not be discarded, because their carboxyl groups promote the formation of hydrogen bonds that cause the arrangement of a stable elastic network. [22] Figure 5 also shows that the film with G ¼ 19% yields the highest elastic modulus measured, which is attributed to the fact that a further irradiation time results in a lower E 0 value since the photochemical degradation becomes significant. Although this technique provides functionality to the polymer surface and involves the initiation of vinyl monomer polymerization from reactive sites generated on the film surface, [19,23] the degradation reactions occurring during grafting have to be avoided.…”

Section: Viscoelastic Properties Of the Pp Filmsmentioning

confidence: 82%

Formation of Poly(propylene)‐Based Biocomposite Films and Their Use in the Attachment of Methylene Blue

Cavallo

Gómez

Strumia

2010

Macro Chemistry & Physics

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Biocomposite PP‐g‐PAAc‐CS films based on PP were generated and utilized as support of methylene blue, a thiazidic dye. Using a photograft polymerization of acrylic acid, the PP film was functionalized with carboxyl groups (PP‐g‐PAAc), which attached chitosan by electrostatic bond. A longer poly(acrylic acid) chain or a higher CS immobilization temperature led to a higher chain interpenetration and crosslinking reaction. Immobilized MB confirmed to possess redox activity from its reaction with ascorbic acid, where the dye decomposition rate ($R'_{\rm d} $) increases together with the chain interpenetration, then decreasing with the increase in the crosslinking degree.magnified image

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Section: Viscoelastic Properties Of the Pp Filmsmentioning

confidence: 82%

Formation of Poly(propylene)‐Based Biocomposite Films and Their Use in the Attachment of Methylene Blue

Cavallo

Gómez

Strumia

2010

Macro Chemistry & Physics

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“…16,17 The crossover point of G′ and G″ at low frequencies cannot be detected in the master curves of these graft copolymers, resulting from the microphase-separated structure of the samples.…”

Section: Macromoleculesmentioning

confidence: 99%

Nanostructure and Linear Rheological Response of Comb-like Copolymer PSVS-g-PE Melts: Influences of Branching Densities and Branching Chain Length

et al. 2015

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Comb-like poly(styrene-co-4-(vinylphenyl)-1-butene)-g-polyethylene copolymers (PSVS-g-PE) with various branching parameters were synthesized to study the influence of branch chains on morphology (at melt state) and linear rheological response of the copolymers. The results showed that both the branching density and branch chain length of PSVS-g-PE copolymers strongly affected linear rheological behavior of the copolymers, resulting from the formation of different microphase separation structure in the melt state. PSVS-g-PE copolymers with low branching density (2.3−3.5 branch chains per 100 repeating units of the backbone) showed a microphase-separated structure at the melt state, and a typical rheological characteristic for network-like structure was observed. Furthermore, the type of microphase-separated structure at the melt state strongly influences the applicability of the time−temperature superposition (TTS) principle. As a result, the TTS failure was observed in the modulus curves for PSVS52.7-3.5-PE4.9 (poor-order lamellar structure) and PSVS54.4-2.7-PE10.7 (long tubular structure). In contrast, the PSVS-g-PE sample with high branching density (16.6−24.5 branch chains per 100 repeating units of the backbone) showed homogeneous phase structure and normal rheological behavior, similar to linear or comb-like homopolymers. The gel-like state appeared in a limited frequency regime (a plateau regime of tan δ versus ω) during decreasing the frequency from the high frequency regime in these comb-like copolymers.

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“…Firstly, for all plasma deposited homopolymers (PAA, PS) and the AA/S copolymer samples the values of T g are lower than those measured for conventional poly(acrylic acid) (379 K)33 and polystyrene (373 K) 34. It can be concluded that plasma polymerization technique results in products with a lower molecular weight and probably with a highly branched structure compared to the conventional polymerized materials 35, 36.…”

Section: Resultsmentioning

confidence: 80%

Structure of Plasma‐Deposited Copolymer Films Prepared from Acrylic Acid and Styrene: Part I Dependence on the Duty Cycle

Fahmy

Mix

Schönhals

et al. 2011

Plasma Processes & Polymers

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Copolymers of acrylic acid and styrene (AA/S) were prepared by pulsed plasma deposition and their structures were studied in dependence on the duty cycle (DC) for a fixed composition of 1:1. As a result, low values of DC doses preserve the structure of monomers in the plasma deposited polymers while high DC leads to a higher degree of fragmentation and a loss in regular structure. Regarding plasma copolymerisation as a feasible method to finish surfaces with a definite number of functional groups it is necessary to characterize both, the chemical nature and the physical properties of the deposited layer. Therefore, a combination of different methods was employed for the characterization of thin plasma copolymer films (FTIR, dielectric spectroscopy, differential scanning calorimetry, X‐ray photoelectron spectroscopy (XPS)). Special attention was paid on the unambiguous identification of COOH groups at the surface after derivatization with trifluoroethanol by XPS and in the volume by FTIR. The glass transition temperature of the copolymer system is lower than that for the both plasma deposited homopolymers and increases with the DC in difference to plasma deposited poly(acrylic acid). The dielectric measurements showed that the plasma deposited films were not thermally stable and underwent an undesired post‐plasma chemical reaction. The results obtained by dielectric spectroscopy are discussed in detail in comparison with the data from FTIR and XPS measurements.

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Thermal, morphological and rheological characterization of poly(acrylic acid-g-styrene) amphiphilic graft copolymers

Cited by 38 publications

References 44 publications

Formation of Poly(propylene)‐Based Biocomposite Films and Their Use in the Attachment of Methylene Blue

Formation of Poly(propylene)‐Based Biocomposite Films and Their Use in the Attachment of Methylene Blue

Nanostructure and Linear Rheological Response of Comb-like Copolymer PSVS-g-PE Melts: Influences of Branching Densities and Branching Chain Length

Structure of Plasma‐Deposited Copolymer Films Prepared from Acrylic Acid and Styrene: Part I Dependence on the Duty Cycle

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