Phase morphology and impact toughness of impact polypropylene copolymer

Tan, Hongsheng; Li, Li; Chen, Zhineng; Song, Yihu; Zheng, Qiang

doi:10.1016/j.polymer.2005.02.088

Cited by 119 publications

(107 citation statements)

References 24 publications

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“…2,3,9,[13][14][15] It is generally believed that the dispersed phase in hiPP exhibits a core-shell structure with PE core and EPR shell. [16][17][18][19] This coreshell structure has proven to be efficient for the toughness-rigidity balance of the material. However, the understanding of the phase morphology of hiPP is far from perfect.…”

Section: Introductionmentioning

confidence: 99%

“…There is no report about the role of ethylene-propylene segmented copolymer with short length of ethylene and propylene sequences in the multiple phase morphology formation. Although one does not doubt that the ethylenepropylene block copolymer (or ethylene-propylene segmented copolymer with long sequence length of PE and PP segments, as mentioned in some literature) can be considered a compatibilizer enhancing the interface adhesion between the PP matrix and the EPR dispersed phase, 6,7,17 direct evidence of the distribution of the block copolymer in the interface is still lacking.…”

Section: Introductionmentioning

confidence: 99%

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The functions of crystallizable ethylene‐propylene copolymers in the formation of multiple phase morphology of high impact polypropylene

Tong¹,

Lan²,

Chen³

et al. 2011

J of Applied Polymer Sci

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ABSTRACT:The functions of crystallizable ethylenepropylene copolymers in the formation of multiple phase morphology of high impact polypropylene (hiPP) were studied by solvent extraction fractionation, transmission electron microscopy (TEM), selected area electron diffraction (SAED), nuclear magnetic resonance ( 13 C-NMR), and selected reblending of different fractions of hiPP. The results indicate that hiPP contains, in addition to polypropylene (PP) and amorphous ethylene-propylene random copolymer (EPR) as well as a small amount of polyethylene (PE), a series of crystallizable ethylene-propylene copolymers. The crystallizable ethylene-propylene copolymers can be further divided into ethylene-propylene segmented copolymer (PE-s-PP) with a short sequence length of PE and PP segments, and ethylene-propylene block copolymer (PE-b-PP) with a long sequence length of PE and PP blocks. PE-s-PP and PE-b-PP participate differently in the formation of multilayered core-shell structure of the dispersed phase in hiPP. PE-s-PP (like PE) constructs inner core, PE-b-PP forms outer shell, while intermediate layer is resulted from EPR. The main reason of the different functions of the crystallizable ethylene-propylene copolymers is due to their different compatibility with the PP matrix.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The functions of crystallizable ethylene‐propylene copolymers in the formation of multiple phase morphology of high impact polypropylene

Tong¹,

Lan²,

Chen³

et al. 2011

J of Applied Polymer Sci

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“…There have been a number of papers on morphology of physical blends of iPP with other polymers [20][21][22][23][24][25], as well as the macroscopic relationship between structure and property of the IPCs, and it is clear that the impact properties of these polymers are influenced by the size and distribution of the rubber particles in the polymer after processing [26][27][28][29][30][31][32][33][34]. The final morphology of the polymer can also be influenced by processing parameters [35][36][37][38]. In our view, there is still a lack of fundamental understanding of how the molecular composition of the polymer influences the macroscopic properties of the IPCs.…”

Section: Introductionmentioning

confidence: 99%

Molecular composition and properties of impact propylene copolymers

Aj¹,

Nc²

2012

Express Polym. Lett.

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Abstract. Impact polypropylene copolymers (IPCs) are important commercial materials, but their morphology and molecular architecture are not yet fully understood. In this study the focus was on selectively removing specific fractions from the original IPC, recombining the remaining fractions, and studying the properties and morphology of these recombined polymers. It was found that some properties of the samples changed remarkably, depending on the fraction of material that was removed before recombination. In a similar fashion, morphological changes could be observed. For example, the degree of phase separation and the crystalline morphology of the recombined materials varied noticeably. It was further established that specific copolymer fractions present in the original polymer affect not only the morphology of the final polymer, but also the hardness and impact resistance.

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“…The chain structures of EPR and in particular those of EPS have strong impact on the phase separation and final mechanical properties of IPC. 4,[7][8][9][10][11][12] However, it is difficult for a conventional TSPP to tune the molecular architecture of the EPR and EPS in an independent manner because of the inherent nature of Ziegler-Natta catalysts. Very often the size of the dispersed phase domains is too large and its distribution nonuniform.…”

mentioning

confidence: 99%

An atmosphere‐switching polymerization process: A novel strategy to advanced polyolefin materials

Tian

et al. 2013

AIChE Journal

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Significance: We report on a novel atmosphere-switching polymerization process (ASPP) that produces advanced polyolefin materials with high performance in a single polymerization reactor through unique monomer feeding policies. In the ASPP, each polymer particle is exposed to "atmosphere A" and "atmosphere B" in an alternating manner and time and again. As a result, "polymer A" and "polymer B" are formed within the polymer particle in an alternating manner and time and again too. Two types of polypropylene (PP) in-reactor alloys are prepared: impact polypropylene copolymers (IPCs) with an exceptional stiffness-toughness balance and soft polypropylene alloys (SPPs) with well-defined, high-rubber content sticking-free particles.

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Phase morphology and impact toughness of impact polypropylene copolymer

Cited by 119 publications

References 24 publications

The functions of crystallizable ethylene‐propylene copolymers in the formation of multiple phase morphology of high impact polypropylene

The functions of crystallizable ethylene‐propylene copolymers in the formation of multiple phase morphology of high impact polypropylene

Molecular composition and properties of impact propylene copolymers

An atmosphere‐switching polymerization process: A novel strategy to advanced polyolefin materials

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