Morphological stability in injection-moulded high-density polyethylene/polyamide-6 blends

Fellahi, S.; Favis, Basil D.; Fisa, B.

doi:10.1016/0032-3861(96)87620-8

Cited by 91 publications

(81 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Previous studies [27][28][29] showed that blends molded by CIM generally present skin-core structure. Recently, Fellahi and coworkers 30 studied the morphology of the high-density polyethylene/polyamide-6 blend molded by CIM, and SEM results showed that the dispersed phase PA6 oriented greatly in the subskin and exhibited spherical particles in the core region. Son and coworkers 31 reported that across the part thickness, poly (phenylene oxide)/polyamide-6 blends molded by CIM comprised distinct skin, subskin, and core region.…”

Section: Introductionmentioning

confidence: 98%

Morphology of gas‐assisted and conventional injection molded polycarbonate/polyethylene blend

Zheng

Yang

Yin

et al. 2006

J of Applied Polymer Sci

View full text Add to dashboard Cite

The skin-core structure of the gas-assisted and conventional injection molded polycarbonate (PC)/polyethylene (PE) blend was investigated. The results indicated that both the size and the shape of the dispersed PC phase depended not only on the nature of PC/PE blend and molding parameters, but also on its location in the parts. Although the gas-assisted injection molding (GAIM) parts and conventional injection molding (CIM) part have the similar skin-core structure, the morphology evolution of PC phase in the GAIM moldings and the CIM moldings showed completely different characteristics. In the section perpendicular to the melt flow direction, the morphology of the GAIM moldings included five layers, skin intermediate layer, subskin, core layer, core intermediate layer as well as gas channel intermediate layer, according to the degree of deformation. PC phase changed severely in the core layer of GAIM moldings, as well as in the subskin of CIM moldings. In GAIM parts, PC phase in the core layer of the nongate end changed far more intensely and aligned much orderly than that in the gate end. The morphology of PC phase in the GAIM part molded with higher gas pressure changed more severe than that in the GAIM part molded with lower gas pressure. In a word, PC phase showed more obvious fibrillation in the GAIM moldings than that in the CIM moldings.

show abstract

Section: Introductionmentioning

confidence: 98%

Morphology of gas‐assisted and conventional injection molded polycarbonate/polyethylene blend

Zheng

Yang

Yin

et al. 2006

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Dependendo da sua estrutura, o compatibilizante poderá interagir fisicamente ou quimicamente com os componentes da blenda. Caso ocorra a interação química, haverá a formação de um copolímero in situ, preferencialmente na interface [1][2][3][4] . Desde o início da década de 90, os nanocompósitos poliméricos, compósitos onde o reforço exibe uma dimensão em escala nanométrica (10 -9 m), têm despertado também grande interesse tanto da indústria quanto do meio acadêmico.…”

Section: Introductionunclassified

Desenvolvimento de nanocompósitos a partir de blendas com matriz de PA6

Agrawal¹,

Araújo²,

Mélo³

2011

Polímeros

View full text Add to dashboard Cite

Resumo: Neste trabalho foram desenvolvidos nanocompósitos de polímero/argila a partir de blendas com matriz de PA6. Inicialmente foi avaliado por reometria de torque a reatividade dos copolímeros funcionais PEgAA, PEgMA e EG com a PA6 e a influência destes no sistema PA6/argila. Os ensaios de reometria de torque mostraram que o copolímero PEgAA foi o que apresentou maior reatividade com a PA6. Já nos sistemas de PA6/Argila, o copolímero EG foi o que apresentou a maior interação com o sistema PA6/argila corroborado pelo aumento do torque em função do tempo. Os nanocompósitos foram caracterizados por Difração de Raios-X (DRX), Calorimetria Exploratória Diferencial (DSC), propriedades mecânicas e Microscopia Eletrônica de Varredura (MEV). Os resultados de DRX indicaram que o sistema PA6/CL20A apresentou estrutura intercalada enquanto que os sistemas PA6/EG/CL20A apresentaram estrutura parcialmente esfoliada. Os ensaios de DRX e DSC indicaram que no sistema PA6/EG/CL20A onde a argila foi pré-intercalada na PA6, a mesma ficou localizada na fase de PA6 enquanto que no sistema onde a argila foi pré-intercalada no copolímero EG a mesma ficou localizada na fase de EG. O sistema PA6/EG/CL20A onde a argila foi pré-intercalada na PA6 apresentou propriedades de módulo e resistência ao impacto balanceadas quando comparadas às da PA6. Os ensaios de MEV indicaram que a argila está bem dispersa nos sistemas PA6/CL20A e PA6/EG/CL20A. Palavras-chave: Poliamida 6, blendas poliméricas, nanocompósitos. Development of Nanocomposites from Blends with PA6 MatrixAbstract: In this work polymer/clay nanocomposites from blends with PA6 matrix were developed. Torque rheometry was used to evaluate the reactivity of different copolymers with PA6 and their influence on the PA6/clay system. The nanocomposites were characterized by X-ray Diffraction (XRD), Differential Scanning Calorimetry (DSC), mechanical properties and Scanning Electron Microscopy (SEM). Torque rheometry analysis showed that the PEgAA copolymer exhibited the highest reactivity with PA6 while the EG copolymer showed better interaction with the PA6/Clay system. XRD results indicated that PA6/CL20A system presented intercalated structure, while PA6/ EG/CL20A systems presented a partially exfoliated structure. XRD and DSC analyses indicated that PA6/EG/CL20A system where the clay was pre-intercalated in PA6, the clay was located in the PA6 phase while in the system where the clay was pre-intercalated in the EG copolymer, the clay was located in the EG phase. The PA6/EG/CL20A system where the clay was pre-intercalated into PA6 presented balanced modulus and impact strength properties when compared to PA6. SEM tests showed that the clay is well dispersed in the PA6/ CL20A and PA6/EG/CL20A systems. Keywords: Polyamide 6, polymer blends, nanocomposites. IntroduçãoCom a crescente demanda por novos materiais, as blendas poliméricas, misturas de dois ou mais polímeros ou copolímeros, surgiram como alternativa a síntese de novos polímeros. Entretanto, como a maioria das blendas é imiscíve...

show abstract

“…When both the flow fronts impinge at the weld line, the organoclay and polymer chains may orient perpendicular to the overall flow direction, making it a potential source of weakness. The poor weld line strength of micron-sized fiber-filled polymers have been reported to be due to perpendicular alignment of the filler at weld line plane and to their non-uniform distribution [21]. In the weld line region, the nanoparticles may also hinder molecular diffusion across the weld line interphase and /or promote planar molecular orientation parallel to weld line plane and hence lead to incomplete molecular entanglement [16].…”

Section: Resultsmentioning

confidence: 99%

Weld line behaviour of exfoliated and toughened polypropylene layered silica nanocomposites

et al. 2011

View full text Add to dashboard Cite

Exfoliated and toughened polypropylene nanocomposites prepared by an introduction of a rubber in the form of compatibilizer toughener: ethylene propylene diene based rubber grafted with maleic anhydride (EPDM-g-MAH) were studied in terms of weld line properties and morphology. Effects of addition of rubber and nanolayer on weld line strength under tensile loading condition of polypropylene matrix were investigated. Data showed that in the absence of either EPDM or nanolayers, a sharp decrease in weld line strength cannot be avoided whereas in the presence of each in optimum ratio, the drastic increase in both toughness and weld line strength values can be easily reached. The beneficial effect is believed to come from the selective placing of nanolayers around the rubber droplets and making them smaller in size which contributes to diffused weld line regions with high mechanical strength.

show abstract

Morphological stability in injection-moulded high-density polyethylene/polyamide-6 blends

Cited by 91 publications

References 26 publications

Morphology of gas‐assisted and conventional injection molded polycarbonate/polyethylene blend

Morphology of gas‐assisted and conventional injection molded polycarbonate/polyethylene blend

Desenvolvimento de nanocompósitos a partir de blendas com matriz de PA6

Weld line behaviour of exfoliated and toughened polypropylene layered silica nanocomposites

Contact Info

Product

Resources

About