Effect of reactive compatibilization on the properties of poly(butylene terephthalate)/acrylonitrile–ethylene–propylene–diene–styrene blends

Abstract

Blends of poly(butylene terephthalate) (PBT) with 30 wt % acrylonitrile–ethylene–propylene–diene–styrene (AES) were prepared with methyl methacrylate (MMA)/glycidyl methacrylate (GMA)/ethyl acrylate (EA) terpolymers (MGEs) as compatibilizing agents. These acrylic terpolymers were miscible with the styrene–acrylonitrile (SAN) phase of AES, whereas the epoxide groups of GMA could react with the PBT end groups; this could lead to the formation of grafted copolymers (PBT‐g‐MGE) at the PBT/AES interface during the melt processing of the blends if at least a fraction of this interface was formed between the PBT and SAN phases. This study found evidence of the aforementioned interfacial structure through the effectiveness of the MGE terpolymers in promoting the compatibilization, as evaluated by dynamical mechanical analysis, through the increase in the viscosity of the blends, and through the reduction of the AES particle size dispersed in the PBT matrix. These effects became more intense with an increase in the overall concentration of GMA in the blends and with a reduction of the molecular weight of MGE. Another effect promoted by the compatibilization was a remarkable reduction of the brittle–ductile transition temperatures of the blends, which was correlated with the reduction of the AES particle size. However, this correlation between the brittle–ductile transition temperatures and particle size did not hold for the blend with the lowest AES particle size, which showed a high ductile–brittle transition temperature. These mechanical behaviors were examined on the basis of the current theory of the toughening of thermoplastics, which takes into account the importance of the rubber interparticle distance and the cavitation process of these particles. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 1244–1259, 2005

Effects of addition of acrylic compatibilizer on the morphology and mechanical behavior of amorphous polyamide/SAN blends

“…6 The polymerization reaction was carried out in a reactor under intensive mixing and nitrogen atmosphere at 80 C for 8 h. The copolymers were synthesized with 1, 5, and 10 wt % of MA, using toluene as solvent. To control the molecular weight of the copolymers, the initiator benzoil peroxide was used at different concentrations as follows: for high-molecular-weight (HMW) 1% of peroxide; for medium-molecular-weight (MMW) 2% of peroxide; and for low-molecular-weight (LMW) 5% of peroxide.…”

“…Thus, it is necessary to understand the effects of molecular parameters of these copolymers on their ability for compatibilizing the polymer system under study. Larocca et al 6 have observed the compatibilization effects of methyl methacrylate-glycidyl methacrylate (MGE) copolymer on the PBT/AES/MGE blends, where low-molecular-weight MGE grades are more efficient.…”

Effects of the molecular structure of impact modifier and compatibilizer on the toughening of PBT/SBS/PS‐GMA blends

“…The characteristics of ABS and AES make the ultimate viscosity of PBT/ABS and PBT/ AES blends very high, which causes difficulties in the injection molding step of these systems. Compatibilized PBT/ABS 19,[21][22][23][24][25] and PBT/AES blends, 26 i.e., blends with improved impact properties and more stable phase morphology within a large processing range were obtained using poly (methyl-methacrylateran-glycidyl methacrylate) (MMA-GMA) reactive copolymers as in situ compatibilizers. For PBT/SBS blends, however, compatibilization has still not been established.…”

Influência das condições de processamento na obtenção de blendas PBT/ABS

“…Utilizando reometria de torque, Mantovani [5] verificou que ocorreu aumento acentuado do torque quando o MGE foi adicionado à blenda PBT/ABS, e ilustrou a reação de compatibilização da blenda PBT/ABS/MGE. A partir de então foram realizadas diversas pesquisas [6][7][8][9][10][11] com a blenda PBT/ABS compatibilizada com o terpolímero MGE, porém as variáveis de processamento investigadas se restringiram à comparação entre extrusoras com rosca simples e dupla, e perfil térmico na extrusão e na moldagem por injeção. Mais recentemente foram realizadas pesquisas para verificar a influência das condições de processamento em extrusora com rosca dupla corotacional e interpenetrante (ERDCI), sobre as características da blenda PBT/ABS [12] , cujos resultados serão em parte apresentados neste estudo.…”