Synthesis and Structure-Property Relationships of Polypropylene-g-poly(ethylene-co-1-butene) Graft Copolymers with Well-Defined Long Chain Branched Molecular Structures

doi:10.1021/ma200604y

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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, Lu 1,2; Wan, Dong 1,2; Zhang, Zhenjiang 1,2; Liu, Feng 1,2; Xing, Haiping 1,2; Wang, Yanhui 1; Tang, Tao 1
刊名	MACROMOLECULES
	2011-06-14
卷号	44 期号:11 页码:4167-4179
ISSN号	0024-9297
DOI	10.1021/ma200604y
英文摘要	A 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.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000291288900020
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/72609]
专题	中国科学院化学研究所
通讯作者	Tang, Tao
作者单位	1.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
推荐引用方式 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.