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Synthesis and Structure-Property Relationships of Polypropylene-g-poly(ethylene-co-1-butene) Graft Copolymers with Well-Defined Long Chain Branched Molecular Structures
Wang, Lu1,2; Wan, Dong1,2; Zhang, Zhenjiang1,2; Liu, Feng1,2; Xing, Haiping1,2; Wang, Yanhui1; Tang, Tao1
2011-06-14
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume44Issue:11Pages:4167-4179
AbstractA series of polypropylene-g-poly(ethylene-co-1-butene) (PP-g-EBR) graft copolymers with well-defined long chain branched (LCB) molecular structures were synthesized via the combination of coordination polymerization and anionic polymerization. The structure property relationships of PP-g-EBR were systematically investigated. The structural information was clarified by characterization of (1)H NMR and SEC equipped with triple detectors. The DMA measurements demonstrated that the amorphous EBR branches were miscible with the PP backbones. The melt behavior of the PP-g-EBRs was studied with small-amplitude dynamic rheological measurements. Increasing branch length and branch density both led to increased zero-shear viscosity, more pronounced shear-thinning behavior, elevated value of storage modulus at low shear frequencies, more significant upshift deviation from linear behavior in the Han plot, and reduced loss angle. Comparatively, branch length contributed more to the improvement of rheological properties than branch density did. Interestingly, DSC results showed that the crystallization temperature of PP-g-EBR increased with the enhancement of branch length and branch density; however, when the LCB level exceeded a certain degree, further increasing the LCB level would reduce the crystallization temperature.
DOI10.1021/ma200604y
Indexed BySCI
Language英语
WOS IDWOS:000291288900020
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:34[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/72610
Collection中国科学院化学研究所
Corresponding AuthorTang, Tao
Affiliation1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Wang, Lu,Wan, Dong,Zhang, Zhenjiang,et al. Synthesis and Structure-Property Relationships of Polypropylene-g-poly(ethylene-co-1-butene) Graft Copolymers with Well-Defined Long Chain Branched Molecular Structures[J]. MACROMOLECULES,2011,44(11):4167-4179.
APA Wang, Lu.,Wan, Dong.,Zhang, Zhenjiang.,Liu, Feng.,Xing, Haiping.,...&Tang, Tao.(2011).Synthesis and Structure-Property Relationships of Polypropylene-g-poly(ethylene-co-1-butene) Graft Copolymers with Well-Defined Long Chain Branched Molecular Structures.MACROMOLECULES,44(11),4167-4179.
MLA Wang, Lu,et al."Synthesis and Structure-Property Relationships of Polypropylene-g-poly(ethylene-co-1-butene) Graft Copolymers with Well-Defined Long Chain Branched Molecular Structures".MACROMOLECULES 44.11(2011):4167-4179.
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