Polyethylene with Laddered Long-Chain Branching

Contributor(s):

Dahui Zhao

Pai Wang

Froese RD. * Arriola DJ. den Dölder J. Hou J. Kashyap T. Lu K, Martinetti L. Stubbert BD. The Dow Chemical Company, Midland, USA
A Commercially Viable Solution Process to Control Long-Chain Branching in Polyethylene.

Science 2024;
383: 1223-1228
DOI: 10.1126/science.adn3067.

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Key words

low-density polyethylene - long-chain branching - ladder polymer - polyolefins

Significance

Low-density polyolefin (LDPE) with long-chain branching (LCB) is an important type of commodity product, in which the LCB is usually introduced by a radical process under high-pressure conditions. In this work, a more cost-effective synthetic method is developed for LDPE with ladder-type LCB, presenting similar rheological properties to conventional LDPE.

Comment

The imino-enamido Hf catalyst is selected for its advantageous dual active sites. Hence, two polymer chains can grow from a single catalytic center. With diene introduced as a co-monomer, laddered LCB can be achieved, and the unique polymer structure is confirmed by ¹³C NMR spectroscopy.

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Publication History

Article published online:
14 June 2024

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany

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