Polymer blends based on the β-modification of polypropylene

Menyhárd, Alfréd; Varga, J.; Liber, A.; Belina, G.

doi:10.1016/j.eurpolymj.2004.10.036

Cited by 88 publications

(58 citation statements)

References 19 publications

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“…When the crystallization temperature of the second component with a nucleating effect is below the crystallization temperature of PP, it will not affect the formation of b-PP otherwise it will inhibit the formation of b-PP. For example, in blends of b-PP/poly(vinylidene difluoride) (PVDF) and b-PP/PA6, it is hard to form b-PP, though the high efficient b-nucleating agents are added, because PVDF and PA6 have very strong a nucleating effect and higher melting point than PP.Menyhá rd and Varga found that in blends of b-PP/PA6 with no compatibilizer modification, PP matrix containing a-PP is formed [13]. On the contrary, in the presence of maleic anhydride grafted PP (PP-g-MA) compatibilizer, mainly b-PP matrix forms [13].…”

Section: Introductionmentioning

confidence: 97%

“…For example, in blends of b-PP/poly(vinylidene difluoride) (PVDF) and b-PP/PA6, it is hard to form b-PP, though the high efficient b-nucleating agents are added, because PVDF and PA6 have very strong a nucleating effect and higher melting point than PP.Menyhá rd and Varga found that in blends of b-PP/PA6 with no compatibilizer modification, PP matrix containing a-PP is formed [13]. On the contrary, in the presence of maleic anhydride grafted PP (PP-g-MA) compatibilizer, mainly b-PP matrix forms [13]. The formation of a-PP with no compatibilizer is associated with the phenomenon that b-nucleating agent is wrapped by polar PA6 phase.…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Crystallization and melting behavior of polypropylene in β-PP/polyamide 6 blends containing PP-g-MA

Lin¹,

Guan²,

Xu³

et al. 2013

Journal of Industrial and Engineering Chemistry

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Crystallization and melting behavior of polypropylene in β-PP/polyamide 6 blends containing PP-g-MA

Lin¹,

Guan²,

Xu³

et al. 2013

Journal of Industrial and Engineering Chemistry

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“…Recently, more attention has been paid to iPP β crystal because of its excellent thermal and mechanical properties. It has been observed that β-PP blends can be prepared without any difficulty if the PP is compounded with an amorphous [16][17][18][19]. With the increase of LiCl, the PA6 phase in blends gradually transformed form semi-crystalline to an amorphous state.…”

Section: Resultsmentioning

confidence: 97%

Effect of LiCl on the miscibility and crystallization behavior of a hydrophilic PP/PP-g-MAH/PA6 blend

Shao

Yang

et al. 2015

J Polym Res

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In order to investigate the effect of LiCl on the miscibility and crystallization behavior of polypropylene/ maleic anhydride-grafted polypropylene/polyamide-6 (PP/ PP-g-MAH/PA6) blends, a series of PP/PP-g-MAH/PA6 blends with different LiCl contents were prepared by using a twin-screw extruder. The phase morphology of blends, crystallization behavior, crystal forms and compatibilizing mechanism were investigated by scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR), differential scanning calorimeter (DSC) and X-ray diffraction analysis(XRD). The results showed a small amount of LiCl could improve the miscibility of PP/PP-g-MAH/PA6 blends due to its catalysis for the reactions of anhydride of maleic anhydride-grafted polypropylene (PP-g-MAH) with the amino end groups of polyamide 6 (PA6). However, the situation was just the opposite in the presence of more than 0.75 wt% of LiCl. In addition, the hydrophilicity of polypropylene (PP) was largely improved due to the introduction of hygroscopic PA6 and LiCl. The water contact angle of PP-PA 2.25 decreased from 103°to 65°compared with pure PP. Thus this study might provide a promising route to generate polymer membranes in the wastewater treatment field.

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“…Because PA6 was a strong a-nucleating agent for iPP, [10][11][12] there was competition between the nucleating effect of PA6 and b-NA in the PA6/iPP system, and at a relatively low b-NA content (<0.1 wt %), the resulting crystal modification of iPP was mainly a modification. As clearly shown in Figure 3(a-c), the crystals in iPP were mainly a-iPP, and an epitaxial crystallization of iPP occurred around the PA6 particles.…”

Section: Fracture Morphology Of the Ipp Matrixmentioning

confidence: 98%

“…When b-nucleated iPP is blended with other semicrystalline polymers, especially those with a-nucleating effects, for example, poly(vinylidene fluoride) and polyamide, the formation of b-phase iPP (b-iPP) is generally suppressed. [9][10][11] It was found that the compounding method and the processing temperature determined the relative content of b-iPP in bnucleated PA6/PP alloys. [12][13][14] Yang et al 14 reported that the addition of a b-nucleating agent (b-NA) at a temperature below 190 C led to a high relative content of b crystals because PA6 remained in the solid state and b-NA was mainly dispersed in the iPP matrix.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and thermal characteristics and morphology of polyamide 6/isotactic polypropylene blends in the presence of a β‐nucleating agent

Wang

Yang

et al. 2011

J of Applied Polymer Sci

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The mechanical and thermal characteristics and morphology of polyamide 6 (PA6)/isotactic polypropylene (iPP) blends (10/90 w/w) prepared with different processing procedures and incorporated with an aryl amide nucleating agent, a kind of b-nucleating agent (b-NA) for iPP, were investigated. The yield strength and flexural modulus of the blends decreased as b-NA was introduced into the blends, whereas the impact strength and elongation at break improved. The crystalline structures of the blends closely depended on (1) the processing conditions and (2) competition between the b-nucleating effect of b-NA and the a-nucleating effect of PA6 for iPP. Scanning electron microscopy, differential scanning calorimetry, and X-ray diffraction were adopted to reveal the microstructures of the blends. At a low b-NA content (<0.1 wt %), the a-phase iPP dominated the blends, whereas the relative content of the b-phase iPP increased remarkably when the b-NA content was not less than 0.1 wt %. The processing conditions also showed profound influences on the supermolecular structures of iPP; this resulted in different mechanical properties of the blends. As for PA6, the crystallization behavior and crystalline structure did not exhibit obvious changes, but PA6 did play an important role in the epitaxial crystallization of iPP on PA6.

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Polymer blends based on the β-modification of polypropylene

Cited by 88 publications

References 19 publications

Crystallization and melting behavior of polypropylene in β-PP/polyamide 6 blends containing PP-g-MA

Crystallization and melting behavior of polypropylene in β-PP/polyamide 6 blends containing PP-g-MA

Effect of LiCl on the miscibility and crystallization behavior of a hydrophilic PP/PP-g-MAH/PA6 blend

Mechanical and thermal characteristics and morphology of polyamide 6/isotactic polypropylene blends in the presence of a β‐nucleating agent

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