Local and Collective Motions in Precise Polyolefins with Alkyl Branches: A Combination of 2H and 13C Solid-State NMR Spectroscopy

被引：39

作者：

Wei, Yuying ^{[1
]}

Graf, Robert ^{[2
]}

Sworen, John C. ^{[1
]}

Cheng, Chi-Yuan ^{[1
]}

Bowers, Clifford R. ^{[1
]}

Wagener, Kenneth B. ^{[1
]}

Spiess, Hans Wolfgang ^{[2
]}

机构：

[1] Univ Florida, Dept Chem, Gainesville, FL 32611 USA

[2] Max Planck Inst Polymer Res, D-55128 Mainz, Germany

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2009年 / 48卷 / 25期

基金：

美国国家科学基金会;

关键词：

defects; molecular dynamics; NMR spectroscopy; polymer branching; polyolefins; MAGNETIC-RESONANCE; MOLECULAR-DYNAMICS; AMORPHOUS REGIONS; CHAIN DIFFUSION; ROTATOR PHASE; POLYETHYLENE; COPOLYMERS; POLYMERS; CRYSTALLINE; PACKING;

D O I：

10.1002/anie.200900377

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Branching out: The mobility of linear polymers changes upon branching, which has a pronounced effect on processability and drawability. Regularly branched model polyolefins were studied by advanced solid-state NMR spectroscopy, and twist defects around the branches in the crystalline regions are identified. For lower branch content, the twisting motions are decoupled; for higher content, collective motion is found (see picture). © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.

引用

收藏

页码：4617 / 4620

页数：4

相关论文

共 30 条

[1] Crystallization rates of matched fractions of MgCl2-supported Ziegler-Natta and metallocene isotactic poly(propylene)s.: 1.: The role of chain microstructure [J].

Alamo, RG ;

Blanco, JA ;

Agarwal, PK ;

Randall, JC .

MACROMOLECULES, 2003, 36 (05) :1559-1571

[2] Morphological partitioning of ethylene defects in random propylene-ethylene copolymers [J].

Alamo, RG ;

VanderHart, DL ;

Nyden, MR ;

Mandelkern, L .

MACROMOLECULES, 2000, 33 (16) :6094-6105

[3] CONFORMATIONAL EFFECTS AND CONFIGURATIONAL SPLITTING IN C-13 NMR-SPECTRA OF SYNTHETIC-POLYMERS AS INVESTIGATED BY AB-INITIO INDIVIDUAL GAUGES FOR LOCALIZED MOLECULAR-ORBITALS (IGLO) CALCULATIONS [J].

BORN, R ;

SPIESS, HW .

MACROMOLECULES, 1995, 28 (23) :7785-7795

[4] Well-defined precision ethylene/vinyl fluoride polymers: Synthesis and crystalline properties [J].

Boz, Emine ;

Nemeth, Alexander J. ;

Wagener, Kenneth B. ;

Jeon, Keesu ;

Smith, Robert ;

Nozirov, Farhod ;

Bockstaller, Michael R. ;

Alamo, Rufina G. .

MACROMOLECULES, 2008, 41 (05) :1647-1653

[5] DEUTERIUM QUADRUPOLE-ECHO NMR-SPECTROSCOPY .3. PRACTICAL ASPECTS OF LINESHAPE CALCULATIONS FOR MULTIAXIS ROTATIONAL PROCESSES [J].

GREENFIELD, MS ;

RONEMUS, AD ;

VOLD, RL ;

VOLD, RR ;

ELLIS, PD ;

RAIDY, TE .

JOURNAL OF MAGNETIC RESONANCE, 1987, 72 (01) :89-107

[6] NMR experiments and molecular dynamics simulations of the segmental dynamics of polystyrene [J].

He, YY ;

Lutz, TR ;

Ediger, MD ;

Ayyagari, C ;

Bedrov, D ;

Smith, GD .

MACROMOLECULES, 2004, 37 (13) :5032-5039

[7] THE KINETICS OF CONFORMATIONAL TRANSITIONS - EFFECT OF VARIATION OF BOND ANGLE BENDING AND BOND STRETCHING FORCE-CONSTANTS [J].

HELFAND, E ;

WASSERMAN, ZR ;

WEBER, TA ;

SKOLNICK, J ;

RUNNELS, JH .

JOURNAL OF CHEMICAL PHYSICS, 1981, 75 (09) :4441-4445

[8] CHAIN MOTION IN THE AMORPHOUS REGIONS OF POLYETHYLENE AS REVEALED BY DEUTERON MAGNETIC-RESONANCE [J].

HENTSCHEL, D ;

SILLESCU, H ;

SPIESS, HW .

MACROMOLECULES, 1981, 14 (05) :1605-1607

[9] Influence of molecular structure on the rheology and thermorheology of metallocene polyethylenes [J].

Hussein, Ibnelwaleed A. ;

Hameed, Tayyab ;

Williams, Michael C. .

JOURNAL OF APPLIED POLYMER SCIENCE, 2006, 102 (02) :1717-1728

[10] Influence of branch content, comonomer type, and crosshead speed on the mechanical properties of metallocene linear low-density polyethylenes [J].

Islam, A ;

Hussein, IA .

JOURNAL OF APPLIED POLYMER SCIENCE, 2006, 100 (06) :5019-5033