Morphology and Thermal Properties of MCPA6/ABS by in situ Polymerization of <i>ε</i>‐Caprolactam

Hou, Lianlong; Yang, Guisheng

doi:10.1002/macp.200500160

Cited by 13 publications

(12 citation statements)

References 51 publications

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“…34,35 The formation of this structure in the presence of 10% compatibilizer may be as a consequence of increased extent of reaction between PA6 and maleic anhydride; so the formation of thermally stable a-crystals is hindered because of this grafting reaction. 36,37 This phenomenon is also observed from the X c and T c , which are lower when compared to other blend systems. The chemical reaction leading to increase in the viscosity of the media can decrease the crystallization rate and crystal growth.…”

Section: Differential Scanning Calorimeter Analysissupporting

confidence: 57%

Effects of olefin‐based compatibilizers on the morphology, thermal and mechanical properties of ABS/polyamide‐6 blends

Özkoç

Bayram

Bayramlı

2007

J of Applied Polymer Sci

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In this study, commercially available epoxidized and maleated olefinic copolymers, EMA-GMA (ethylene-methyl acrylate-glycidyl methacrylate) and EnBACO-MAH (ethylene-n butyl acrylate-carbon monoxide-maleic anhydride), were used at 0, 5, and 10% by weight to compatibilize the blend composed of ABS (acrylonitrile-butadiene-styrene) terpolymer and PA6 (polyamide 6). Compatibilizing performance of these two olefinic polymers was investigated from blend morphologies, thermal and mechanical properties as a function of blend composition, and compatibilizer loading level. Scanning electron microscopy (SEM) studies showed that incorporation of compatibilizer resulted in a fine morphology with reduced dispersed particle diameter at the presence of 5% compatibilizer. The crystallization behavior of PA6 phase in the blends was explored for selected blend compositions by differential scanning calorimetry (DSC). At high compatibilizer level a decrease in the degree of crystallization was observed. In 10% compatibilizer containing blends, formation of g-crystals was observed contrary to other compatibilizer compositions. The behavior of the compatibilized blend system in tensile testing showed the negative effect of using excess compatibilizer. Different trends in yield strengths and strain at break values were observed depending on compatibilizer type, loading level, and blend composition. With 5% EnBACO-MAH, the blend toughness was observed to be the highest at room temperature. 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: [926][927][928][929][930][931][932][933][934][935] 2007

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Section: Differential Scanning Calorimeter Analysissupporting

confidence: 57%

Effects of olefin‐based compatibilizers on the morphology, thermal and mechanical properties of ABS/polyamide‐6 blends

Özkoç

Bayram

Bayramlı

2007

J of Applied Polymer Sci

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“…The anionic ring‐opening polymerization of ϵ‐caprolactam to synthesize PA6 is endowed with high yield and rapid reaction rate 14. Because in situ blending is an effective way to control the morphologies, some efforts to in situ blending PA615–21 have been made to modify certain properties and expand its application. In authors' laboratory, a new approach has been developed to improve the toughness of monomer casting nylon‐6 (MCPA6), in which PA66 was dissolved in molten ϵ‐caprolactam and anionic polymerization was conducted to generate molecular composites of MCPA6/PA66 15.…”

Section: Introductionmentioning

confidence: 99%

Influence of preparation methods on structure and properties of PA6/PA66 blends: A comparison of melt‐mixing and in situ blending

Wang

Zheng

Yang

2007

J Polym Sci B Polym Phys

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The blends composed of polyamide 6 (PA6) and polyamide 66 (PA66) were obtained using two different preparation methods, one of which was the melt-mixing through a twin-screw extruder and the subsequent injection molding; and the other, the in situ blending through anionic polymerization of e-caprolactam in the presence of PA66. For the former, there existed a remarkable improvement in toughness but a drastic drop in strength and modulus; however, for the latter, a reverse but less significant trend of mechanical properties change appeared. Various characterizations were conducted, including the analyses of crystalline morphology, crystallographic form, and crystallization and melting behaviors using polarized optical microscopy (POM), wide-angle X-ray diffraction (WAXD), and differential scanning calorimetry (DSC), respectively; observation of morphology of fractured surface with scanning electron microscope (SEM); measurement of glass transition through dynamic mechanical analysis (DMA); and the intermolecular interaction as well as the interchange reaction between the two components by Fourier transform infrared spectrometry (FT-IR) and 13 C solution NMR. The presence and absence of interchange reaction was verified for the in situ and melt-mixed blends, respectively. It is believed that the transreaction resulted in a drop in glass transition temperature (T g ) for the in situ blends, contrary to an increase of T g with increasing PA66 content for the melt-mixed ones. And the two kinds of fabrication methods led to significant differences in the crystallographic form, spherulite size and crystalline content and perfection as well. Accordingly, it is attempted to explain the reasons for the opposite trends of changes in the mechanical properties for these two blends.

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“…The anionic ring‐opening polymerization of ε ‐caprolactam to synthesize polyamide 6 (MCPA6) is endowed with high yield and high reaction rate 26 . In‐situ blending, as an effective way of controlling the morphologies, facilitates modifying certain properties and expanding its application 27–32. In author's laboratory, a new approach has been developed to improve the toughness of MCPA6, in which PA66 was dissolved in melted ε ‐caprolactam and the anionic polymerization was conducted to in‐situ fabricate PA6/PA66 blends 27.…”

Section: Introductionmentioning

confidence: 99%

Influence of preparation methods on the structures and properties for the blends between polyamide 6co6T and polyamide 6: Melt‐mixing and in‐situ blending

Wang

Zheng

et al. 2007

J Polym Sci B Polym Phys

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Two blends between polyamide 6 (PA6) and Polyamide 6co6T (PA6co6T, a random copolymer between polyamide 6 and polyamide 6T) were fabricated by meltmixing on a twin-screw extruder and the subsequent injection molding, or through the in-situ polymerization of e-caprolactam in the presence of PA6co6T. As far as the former method is concerned, there exist an obvious decline of toughness and a slight increase in strength and modulus; however, for the latter, there appear a remarkable improvement in toughness and a simultaneous moderate increase in strength and modulus. A series of characterizations were carried out including scanning electron microscopy, wide-angle X-ray diffraction, polarized optical microscopy, differential scanning calorimetry, dynamic mechanical analysis, and Fourier transform infrared spectrometry. It is found that both blends exhibit single glass transition on DMA tan d curves. However, contrary to that of the melt-mixed blends, the glass transition temperature (T g ) of the in-situ ones decreases with increasing PA6co6T content. It is suggested that different mixing levels are the main reasons. Moreover, the addition of PA6co6T containing linear rigid segments conducts remarkable refinement of spherulites for the blends. Significantly different changes in the crystallographic form, spherulite size, crystalline content and perfection due to the introduction of PA6co6T for the two blends are ascribed to their varied thermomechanical histories and the presence of interchange reaction only for the in-situ blends. On the basis of the characterizations of the microstructures, the different trends of changes in the mechanical properties with the addition of PA6co6T for the two fabrication methods are discussed.

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Morphology and Thermal Properties of MCPA6/ABS by in situ Polymerization of ε‐Caprolactam

Cited by 13 publications

References 51 publications

Effects of olefin‐based compatibilizers on the morphology, thermal and mechanical properties of ABS/polyamide‐6 blends

Effects of olefin‐based compatibilizers on the morphology, thermal and mechanical properties of ABS/polyamide‐6 blends

Influence of preparation methods on structure and properties of PA6/PA66 blends: A comparison of melt‐mixing and in situ blending

Influence of preparation methods on the structures and properties for the blends between polyamide 6co6T and polyamide 6: Melt‐mixing and in‐situ blending

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