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Polymer Chemistry 2018

Polymer Sciences

ISSN: 2471-9935

Page 48

March 26-28, 2018

Vienna, Austria

3

rd

Edition of International Conference and Exhibition on

Polymer Chemistry

A

mong polymeric materials, polyolefins are clear leaders with

respect to both world production scale and sustainability.

Produced in solvent-free and environmentally friendly processes,

they combine high resource-, eco-, energy- and cost-efficiency

with low weight and outstanding versatility in terms of properties,

processing, applications, and recycling. However, to compete with

metals they require reinforcement by alien materials which impair

recycling and processing. Special processing technologies such

as lamination of stretched tapes and fiber technology are required

to produce “all polyolefin composites” in which both matrix and

reinforcingphasesconsistofpolyolefin.Atthebeginningofthe21

st

century, remarkable progress inmultisite polymerization catalysis

enables to produce reactor blends with tailored molar mass

distribution which formextended-chain polyolefin during injection

molding and extrusion, typical for commodity polyolefins. Robust

chromium sites produce nanophase-separated ultrahigh molar

mass polyethylene (UHMWPE) unaffected by other sites during

ethylene polymerization on supported multisite catalysts. The

site blend ratio governs ultrabroad PE molar mass distributions

and nanostructures with unprecedented precision. Owing to

significantly reduced UHMWPE entanglement, reactor blends

with high UHMWPE content (>20 wt.-%) are melt processable by

classical injection molding. HDPE wax serves as a processing

aid which cocristallizes and does not cause emission and odor

problems. This

in situ

formation of nanophase-separated fiber-

like extended chain UHMWPE, with an average diameter of 80 nm,

effectivelyreinforcestheHDPEmatrixasexpressedbysignificantly

improved strength/stiffness/toughness balance. In addition

to tailoring two- and three-site catalysts systems and reactor

blends, nanophase-separated UHMWPE embedded in HDPE wax

represents a versatile new additive enabling fabrication of all-

polyethylene composites by melt compounding without affecting

ethylene polymerization of commodity polyethylenes. Hence, this

versatile route to sustainable all-polyethylene composites holds

great promise for converting commodity polyolefin materials into

high performance engineering materials without impairing melt

processing, sustainability and facile recycling. Unlike common

polyolefin nanocomposites, neither handling of problematic

nanofillers nor special composite processing is required.

Recent Publications

1. M. Stürzel; S. Mihan; R. Mülhaupt (2016) From Multisite

Polymerization Catalysis to Sustainable Materials and

All-Polyolefin Composites, Chem. Rev. 116, 1398.

2. F. Zhong; J. Schwabe; D. Hofmann; J. Meier; R. Thomann,

M. Enders, R. Mülhaupt (2018) All-polyethylene

composites reinforced via extended-chain UHMWPE

nanostructure formation during melt processing,

Polymer 140, 107.

3. M. Stürzel; T. Hees; M. Enders; Y. Thomann; H. Blattmann;

R. Mülhaupt (2016), Nanostructured Polyethylene

Reactor Blends with Tailored Trimodal Molar Mass

Distributions

as

Melt-Processable

All-Polymer

Composites, Macromolecules 49, 8048.

4. M. Stuerzel; A. Kurek; T. Hees; Y. Thomann; H. Blattmann;

R. Mülhaupt (2016) Multisite catalyst mediated

polymer nanostructure formation and self-reinforced

polyethylene reactor blends with improved toughness/

stiffness balance, Polymer 102, 112. 

Biography

Prof. Dr. Rolf Mülhaupt studied chemistry at University of Freiburg, Germany

(1973-1978) and got his PhD (1981) at ETH Zürich, Switzerland. After indus-

trial research at DuPont Central Research (1981-1985) in Wilmington, DE,

USA, and at Ciba-Geigy AG (1985-1989) in Marly, Switzerland, since 1989

he is full professor for macromolecular chemistry and director of the Insti-

tute of Macromolecular Chemistry at the University of Freiburg, Germany.

Since 1992 he is the managing director of the Freiburg Materials Research

Center, FMF, at the University of Freiburg, Germany. His research focuses on

polymer chemistry and engineering, sustainable materials, polymerization

catalysis & polyolefins, functional polymer and tailoring polymer systems,

reactive processing and 3D-printing. He has published 456 papers in refer-

eed journals and is listed as coinventor of 106 patent applications. He was

awarded the Silver Medal of ETH-Zürich (1981), Piero Pino GoldMedal of the

Italian Chemical Society (2004), Hermann Staudinger Price of the German

Chemical Society (2009) and the Hermann F. Mark Medal (2013).

[email protected]

All polyolefin composites via nanostructure formation during

melt processing

Rolf Mülhaupt Alexander Kurek, Markus Stürzel, Fan Zhong

and

Timo Hees

Freiburg Materials Research Center, FMF, Albert-Ludwigs University of Freiburg, Germany

Rolf Mülhaupt Alexander Kurek et al., Polym Sci, Volume 4

DOI: 10.4172/2471-9935-C1-008