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The precise control of monomer sequence and stereochemistry in copolymerization is of much interest and importance for the synthesis of functional polymers, but studies toward this goal have met with only limited success to date. We report herein the co‐syndiospecific alternating copolymerization of methoxyphenyl‐ and N , N ‐dimethylaminophenyl‐functionalized propylenes with styrene by half‐sandwich rare‐earth catalysts. This reaction efficiently afforded the corresponding functionalized propylene− alt −styrene copolymers with a perfect alternating sequence and excellent co‐syndiotacticity ( rrrr > 99%), thus constituting the first example of co‐stereospecific alternating copolymerization of polar and non‐polar olefins. 02/19/2020 05:49
Huawei's P40 flagship line isn't expected to arrive until the end of March but both the P40 and P40 Pro are already listed on Chinese certification agency TENAA. The Huawei P40 was spotted with two model numbers (ANA-AN00 and ANA-TN00) as was the P40 Pro (ELS-AN00 and ELS-TN00). These are likely the global and China variant model numbers. The only usable bit of information is that all four devices support dual-mode 5G, dual SIM card slots and unsurprisingly run on Android. Huawei P40 and P40 Pro TENAA listings. We're also expecting a top-end P40 Premium Edition which will...

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