Molecular weight of living polymers. Polybutadiene and polyisoprene

Brody, H.; Ladacki, M.; Milkovitch, R.; Szwarc, M.

doi:10.1002/pol.1957.1202510910

Cited by 45 publications

(1 citation statement)

References 3 publications

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“…Besides initiation and propagation, there is no chain transfer and termination in anionic polymerization. 65 Well-defined macromolecules with designed microstructures and topologies are synthesized via anionic polymerization. Szwarc and co-workers also contributed the first kinetics study of styrene anionic polymerization in tetrahydrofuran (THF) at 25 °C in a capillary flow apparatus.…”

Section: Pioneering Investigations On Continuous Flow Anionic Polymer...mentioning

confidence: 99%

Anionic polymerizations in a microreactor

Zhao

Wang

et al. 2022

React. Chem. Eng.

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Section: Pioneering Investigations On Continuous Flow Anionic Polymer...mentioning

confidence: 99%

Anionic polymerizations in a microreactor

Zhao

Wang

et al. 2022

React. Chem. Eng.

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Isoprene Polymers

Senyek

2008

Encyclopedia of Polymer Science and Technology

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Isoprene was first isolated from the pyrolysis products of natural rubber. The first preparation of polyisoprene was reported in 1879. In 1950, the goal of preparing synthetic cis 1,4‐polyisoprene as a counter part to natural rubber was achieved. Attention was then focused on commercial preparation of isoprene for polymerization use. Shortly after the discovery of stereospecific catalysts, the first commercial polyisoprene plant came on stream in 1959–1960 using a lithium catalyst. Isoprene is a reactive diene that undergoes cycloaddition, electrophilic, nucleophilic, free‐radical, and coordinated catalytic addition, and thermal dimerization. Information on the production of isoprene by naphtha cracking as well as the synthetic processes is detailed. Depending on the catalyst and conditions, isoprene may undergo 1,2,3,4, or 1,4 addition leading to several isomeric structures. Coordination catalysts, alkali metal catalysts, and Alfin catalysts are important for polymerization and are discussed. Chemical modification of polymers is a convenient way of altering physical and mechanical properties. Highly unsaturated polymers such as polyisoprene are easily modified because the olefinic bond is readily available. Their high reactivity with a variety of chemical substances offers advantages in chemical modification and vulcanization. However, reaction with oxygen and ozone causes degradation and loss of physical and mechanical properties. Synthetic polyisoprene is processed on conventional rubber machinery. Compounding technology is similar to that used for natural rubber. Typical formulations are given. A brief discussion of isoprene copolymers and 1,4‐ trans ‐polyisoprene is included. Isoprene is classified as a flammable liquid. It is a moderate irritant to the skin, eyes, and mucous membranes. The primary use for cis ‐1,4‐polyisoprene is in tires and tire products. It is also used, eg, in molded and mechanical goods, adhesives, belts, foam rubber, and elastic threads.. Automotive molded products and medical applications are typical. Trans ‐1,4‐Poyisoprene can be extracted, calendered, injection molded, and compression molded. It can be used in blends with other polymers. Its main use is in golf ball covers.

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Viscosity – Molecular Weight Relationships and Unperturbed Dimensions of Linear Chain Molecules

Kurata

Tsunashima

1999

The Wiley Database of Polymer Properties

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Molecular weight of living polymers. Polybutadiene and polyisoprene

Cited by 45 publications

References 3 publications

Anionic polymerizations in a microreactor

Anionic polymerizations in a microreactor

Isoprene Polymers

Viscosity – Molecular Weight Relationships and Unperturbed Dimensions of Linear Chain Molecules

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