Stereoregular Polymerization of (<i>R</i>,<i>S</i>)-Propylene Oxide by an Alumoxane−Propylene Oxide Complex

Wu, Bin; Harlan, C. Jeff; Lenz, Robert W.; Barron, Andrew R.

doi:10.1021/ma9601934

Cited by 38 publications

(29 citation statements)

References 18 publications

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“…[120][121][122][123] Stereopure PPG is a crystalline, yet rubbery, polyester that has been synthesised with many different catalysts. [124][125][126][127][128][129][130][131] Surprisingly, the T g and T m seem to be independent of stereochemistry 126,130-132 since both isotactic 131,133,134 and atactic 132 isomers are crystalline. Moreover, the stereochemistry of the PPG unit in triblock architectures of PPG-b-PEG-b-PPG copolymers has little effect on material properties.…”

Section: Degradable Polymersmentioning

confidence: 97%

Stereochemical enhancement of polymer properties

et al. 2019

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The importance of stereochemistry to the function of molecules is generally well understood. However, to date, control over stereochemistry and its potential to influence properties of the resulting polymers are, as yet, not fully realised. This review focuses on the state-of-the-art with respect to how stereochemistry in polymers has been used to influence and control their physical and mechanical properties as well as begin to control their function. A brief overview of the synthetic methodology by which to access these materials is included, with the main focus directed towards stereochemical control over properties such as mechanical, biodegradation and conductivity. Additionally, the advances being made towards enantioseparation, enantioselective catalyst supports and stereo-directed transitions are discussed. Finally, we also consider the opportunities that the rich stereochemistry of sustainably-sourced monomers could offer in this field. Where possible, parallels and general design principles are drawn together to identify opportunities and limitations that these approaches may present in their effects on materials properties, performance and function.

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Section: Degradable Polymersmentioning

confidence: 97%

Stereochemical enhancement of polymer properties

et al. 2019

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“…Due to irregularities during the polymerization process the material can have some defects where the units show the opposite configuration leading to an optically inactive material. The thermal properties of isotactic PPG comprise a T g of ‐75 °C and a T m of 78 °C …”

Section: Poly(epoxide)smentioning

confidence: 99%

Aliphatic Polyethers: Classical Polymers for the 21st Century

Klein

Wurm

2015

Macromol. Rapid Commun.

104

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Polyethers-polymers with the structural element (R'-O-R)n in their backbone--are an old class of polymers which were already used at the time of the ancient Egyptians. However, still today these materials are highly important with applications in all areas of our life, reaching from the automotive and paper industry to cosmetics and biomedical applications. In this Review, different aliphatic polyethers like poly(epoxide)s, poly(oxetane)s, and poly(tetrahydrofuran) are discussed. Special emphasis is placed on the history, the polymerization techniques (industrially and in academia), the properties, the applications as well as recent developments of these materials.

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“…Alkyl-substituted aluminoxanes were extensively studied in the 1960s as active catalysts in the polymerization of epoxides [1][2][3][4][5][6][7][8][9][10]. According to the mechanism proposed by Vandenberg [1,5,8], the chain growth proceeds via alkoxide active centers and is catalyzed by two aluminum atoms linked with an oxygen bridge (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%