Blends of polyamide 6, polycarbonate, and poly(propylene oxide). II. Reactive compatibilization–thermal degradation relationships

Costa, Dilma Alves; Oliveira, Clara Marize F.

doi:10.1002/app.1697

Cited by 13 publications

(12 citation statements)

References 13 publications

(19 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Degradation of Wet Samples: Chitosan and polycaprolactam (PA6) possess polar groups, so the water is adsorbed onto the polymers while hydrogen bond forming. [26][27][28][29][30][31] As the temperature from 30 reach to 120 o C, the TG curve indicated a degreed of 12 wt% weight loss of chitosan, implying the presence of water; the weight loss of PA6 was about 4 wt%, as indicated in In spite of the water loss, the TG curves indicate that both polymers underwent a single stage of degradation.…”

Section: Table I Samples Blend Ratiosmentioning

confidence: 99%

A kinetic study of thermal degradations of chitosan/polycaprolactam blends

2004

View full text Add to dashboard Cite

We have used FT-IR spectra to explain the effects of hydrogen bonding between chitosan and polycaprolactam (PA6). A dynamic mechanical analysis study suggested that the optimum chitosan and PA6 miscibility under the conditions of this experiment were obtained at a blending ratio of 40:60. We studied the thermal degradation of chitosan blended with PA6 (chitosan/PA6) by thermogravimetric analysis and kinetic analysis (by the Ozawa method). Dry chitosan and PA6 exhibited a single stage of thermal degradation and chitosan/PA6 blends having >20 wt% PA6 exhibited at least two stages of degradation. In chitosan/PA6 blends, chitosan underwent the first stage of thermal degradation; the second stage proceeded at a temperature lower than that of PA6, because the decomposition product of chitosan accelerated the degradation of PA6. The activation energies of the blends were between 130 and 165 kJ/mol, which are also lower than that of PA6.

show abstract

Section: Table I Samples Blend Ratiosmentioning

confidence: 99%

A kinetic study of thermal degradations of chitosan/polycaprolactam blends

2004

View full text Add to dashboard Cite

show abstract

“…The annealing temperature 180 C was chosen to avoid the thermal self-degradation of homopolymers and copolymers at higher temperatures [1,11,27] . It is known that the shift in T g provides a direct evidence of polymer miscibility [28] .…”

Section: Thermal Propertiesmentioning

confidence: 99%

“…For example, poly(propylene oxide) can increase the mobilities of PA6 and PC molecules due to the plasticizing effects and consequently increases the probability of the reaction between the -NH 2 and -O-CO-Ogroups of PA6 and PC, respectively [10,11] ; epoxy resin was considered as an effective compatibilizer in PC/PA6 blends for the high chemical reactivity between the epoxide groups and the phenolic hydroxyl end groups of PC or the amide groups of PA6 [5] .…”

Section: Introductionmentioning

confidence: 99%

Influences of hyperbranched polyethylenimine on the reactive compatibilization of polycarbonate/polyamide blends

2015

View full text Add to dashboard Cite

The influences of hyperbranched polyethylenimine (hPEI), which possesses many reactive amino end-groups, on the blending properties of bisphenol-A polycarbonate (PC) and amorphous polyamide (aPA) were systematically investigated. Scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) were used to observe the effect of hPEI on morphologies of PC and aPA phases in bulk blends. While the interfacial fracture toughness between planar PC and aPA layers with and without hPEI was studied by using augmented double cantilever beam (ADCB) method. Results show that the compatibility in PC/aPA blends can be significantly improved by adding a small amount of hPEI, mainly due to the interchange reactions between the polymers leading to the formation of block copolymers, cross-linked polymers and molecules with other constitutions. The augmented double cantilever beam experiments showed that the reactive process drastically reinforced the interfacial adhesion between planar layers of PC and aPA. However, degradation takes place during annealing at 180 C, which was responsible for the production of small molar mass species of PC.

show abstract

“…As misturas físicas de PA6/PC quando processadas a 240 °C durante 10, 30 e 60 minutos, apresentam aumento nos valores de torque durante o processo de mistura [2][3][4][5][6][7] . Nos 5 minutos iniciais, as misturas sofrem processo de fusão, que é caracterizado pela diminuição do torque.…”

Section: T T T T Tor or Or Or Orque Que Que Que Queunclassified

“…Esses copolímeros podem atuar como agente interfacial, melhorando a compatibilidade da mistura [1][2][3][4][5][6] . O Esquema 1 apresenta a reação de troca entre as cadeias de PA6 e de PC com a formação do copolímero em bloco [1][2][3] .…”

Section: Introductionunclassified

Mistura reativa de poliamida 6 e policarbonato: reatividade do copolímero formado "in situ"

et al. 2004

Self Cite

View full text Add to dashboard Cite

Resumo: As misturas físicas de poliamida 6 (PA6) e policarbonato (PC) processadas a 240 ºC, durante 10, 30 e 60 minutos formam um copolímero de PA6-PC. A alta temperatura e o longo tempo de processamento podem causar modificações nas propriedades dessas misturas e degradar o copolímero, originando grupos isocianato e subseqüentemente CO 2 e grupos NH 2 terminais. A quantidade de copolímero PA6-PC formado durante o processo de mistura é maior com o aumento da proporção de PC na mistura. As ligações uretânicas de polímeros termoplásticos exibem mais baixas estabilidades térmica e oxidativa, resultando no aumento da concentração de grupos terminais NH 2 . A reatividade dessas misturas foi investigada através do torque durante o processo de mistura, da titulação potenciométrica dos grupos NH 2 terminais e por microscopia eletrônica de varredura.Palavras-chave: Poliamida 6, policarbonato, mistura reativa. Polyamide 6 and Polycarbonate Reactive Blends: Reactivity of the Copolymer Formed "In Situ"Abstract: Polyamide 6 (PA6) and polycarbonate (PC) blends processed at 240 °C, during 10, 30 and 60 minutes produced a copolymer of PA6-PC. The high temperature and long processing time can cause modifications on the properties of these blends and degradation of the copolymer. It can also form isocyanate groups and subsequently CO 2 and NH 2 "end groups". The amount of PA6-PC copolymer formed during the blending process was found to increase when the PC content is increased. The thermoplastic urethanes normally exhibit smaller thermal and oxidative stability, resulting in an increase in the concentration of NH 2 terminal groups. The reactivity of the blends was investigated by monitoring the torque during the blending, potentiometer titration of NH 2 terminal groups and scanning electronic microscopy (SEM).

show abstract

Blends of polyamide 6, polycarbonate, and poly(propylene oxide). II. Reactive compatibilization–thermal degradation relationships

Cited by 13 publications

References 13 publications

A kinetic study of thermal degradations of chitosan/polycaprolactam blends

A kinetic study of thermal degradations of chitosan/polycaprolactam blends

Influences of hyperbranched polyethylenimine on the reactive compatibilization of polycarbonate/polyamide blends

Mistura reativa de poliamida 6 e policarbonato: reatividade do copolímero formado "in situ"

Contact Info

Product

Resources

About