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Volume 38 - April 2013

Contents

Page 11 of 16

Ziegler-Natta catalysis: 50 years after the Nobel Prize

Research Article

  • Transition metal-catalyzed polymerization of polar allyl and diallyl monomers

  • Daisuke Takeuchi
  • Published online by Cambridge University Press:
    13 March 2013, pp. 252-259

  • Recent advances in polymerization of allyl and diallyl monomers catalyzed by homogeneous Ziegler-Natta catalysts are reviewed. Zirconocene catalysts are effective for copolymerization of ethylene or propylene with Al-masked allyl monomers, as well as homopolymerization of allylsilanes. Phosphine-sulfonate Pd complexes promote the copolymerization of ethylene with various polar allyl monomers, in the absence of a masking agent. Late transition metal catalysts promote stereoselective cyclopolymerization of diallyl monomers having various polar functional groups. The cyclopolymerization of alkyl-substituted diallyl monomers by Pd diimine complexes affords the polymer having alternating oligomethylene and trans-1,2-cyclopentene groups.

News & Analysis

Materials News

Other

  • LuMnO3 thin films reveal ferromagnetic and antiferromagnetic properties simultaneously

  • Published online by Cambridge University Press:
    12 September 2013, p. 672
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Research/Researchers

Other

  • Nano Focus: High-capacity fiber-optic communications at the speed of light uses air as the medium

  • Jean L. Njoroge
  • Published online by Cambridge University Press:
    07 June 2013, p. 441
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Society News

Other

  • 2013 Materials Research Society Spring Meeting continues the conversation in materials research: www.mrs.org/spring2013

  • Published online by Cambridge University Press:
    15 July 2013, pp. 574-577
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News & Analysis

Science Policy

Other

Features

Posterminaries

Other

  • Less is more: A holey grail of materials science

  • Steve Moss
  • Published online by Cambridge University Press:
    15 May 2013, pp. 431-432
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  • The Lesser-Mass Diet

  • Tim Palucka
  • Published online by Cambridge University Press:
    14 January 2013, p. 112
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Profiles & Perspectives

Other

  • Advancing carbon, energy materials: Mildred S. Dresselhaus talks about her work

  • Steve Yalisove
  • Published online by Cambridge University Press:
    13 November 2013, pp. 974-976
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News & Analysis

Materials News

Other

  • Energy Focus: Li-ion microbattery fabricated by 3D printing

  • Published online by Cambridge University Press:
    12 September 2013, p. 672
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Technical Feature

Research Article

  • Hydrogel scaffolds to study cell biology in four dimensions

  • Katherine J.R. Lewis, Kristi S. Anseth
  • Published online by Cambridge University Press:
    13 March 2013, pp. 260-268

  • Poly(ethylene glycol) (PEG) hydrogels represent a versatile material scaffold for culturing cells in two or three dimensions with the advantages of limited protein fouling and cytocompatible polymerization to enable cell encapsulation. By using light-based chemistries for gelation and for incorporating biomolecules into the network, dynamic niches can be created that facilitate the study of how cells respond to user-dictated or cell-dictated changes in environmental signals. Specifically, we demonstrate integration of a photo-cleavable molecule into network cross-links and into pendant functional groups to construct gels with biophysical and biochemical properties that are spatiotemporally tunable with light. Complementary to this approach, an enzymatically cleavable peptide sequence can be introduced within hydrogel networks, in this case through photoinitiated addition reactions between thiol-containing biomacromolecules and ene-containing synthetic polymers, to enable cellular remodeling of their surrounding hydrogel microenvironment. With such tunable material platforms, researchers can employ a systematic approach for 3D cell culture experiments, spatially and temporally modulating physical properties (e.g., stiffness) as well as biological signals (e.g., adhesive ligands) to study cell behavior in response to environmental stimuli. Collectively, these material systems suggest routes for new experimentation to study and manipulate cellular functions in four dimensions.

News & Analysis

Science Policy

Other

  • NRC to help Canadian transportation industry reduce vehicle weight: www.nrc-cnrc.gc.ca

  • Published online by Cambridge University Press:
    09 August 2013, p. 602
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Career Central

Other

  • CAREER CENTRAL

  • Published online by Cambridge University Press:
    12 April 2013, pp. 348-351
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Addendum

Addendum

  • Addendum

  • Published online by Cambridge University Press:
    17 December 2013, p. 1004
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Society News

Other

  • Preview: XXII International Materials Research Congress 2013

  • Published online by Cambridge University Press:
    15 July 2013, p. 579
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News & Analysis

Science Policy

Other

  • NRC releases report on energy efficiency in autos by 2050: www.nap.edu

  • Published online by Cambridge University Press:
    07 June 2013, pp. 422-423
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Features

Image Gallery

Other

  • LOOK AGAIN…

  • Published online by Cambridge University Press:
    06 February 2013, p. 192
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Society News

Other

  • Auciello leads MRS Board of Directors for 2013: www.mrs.org/board

  • Published online by Cambridge University Press:
    14 January 2013, pp. 81-84
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  • Congressional fellows apply science background to policy development

  • Jennifer A. Nekuda Malik
  • Published online by Cambridge University Press:
    15 May 2013, p. 422
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  • Preview: MRS sponsors joint symposia with JSAP

  • Published online by Cambridge University Press:
    15 July 2013, p. 579
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Features

Posterminaries

Other

  • 30 years of MRS Meetings

  • Steven C. Moss
  • Published online by Cambridge University Press:
    13 November 2013, pp. 991-992
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Page 11 of 16