Precision Long-Chain Branched Polyethylene via Acyclic Diene Metathesis Polymerization,ACS Macro Letters

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Precision Long-Chain Branched Polyethylene via Acyclic Diene Metathesis Polymerization
ACS Macro Letters ( IF 5.1 ) Pub Date : 2015-10-21 00:00:00 , DOI: 10.1021/acsmacrolett.5b00641
Hong Li ₁ , Giovanni Rojas _{1,

2} , Kenneth B Wagener ₁

Affiliation

A series of polyethylenes containing 21-carbon alkyl branches have been synthesized by acyclic diene metathesis (ADMET) polymerization. These 21-carbon alkyl branches are precisely placed on every 15th, 19th, 21st, 23rd, and 39th carbon along the polymer backbone. Precision of primary structures of all polymers is verified by ¹H and ¹³C NMR spectroscopy. All polymers present well-defined melting profiles, even at a high branch incorporation (13.3% mol). The melting temperature increases as the branch frequency decreases, similar to what we observed for short-chain branched polyethylenes. These observations together with a good linear relationship derived from Flory’s theory suggest the exclusion of 21-carbon side chains from polyethylene crystal units.

中文翻译：

无环二烯复分解聚合精密长链支化聚乙烯

已经通过无环二烯复分解（ADMET）聚合合成了一系列含有21个碳烷基支链的聚乙烯。这些 21 个碳的烷基支链精确地放置在聚合物主链上的每 15、19、21、23 和 39 个碳上。^通过1 H 和¹³ C NMR 光谱验证所有聚合物的主要结构的精度。即使在高支链掺入量（13.3% mol）下，所有聚合物都呈现出明确的熔融曲线。熔融温度随着支化频率的降低而升高，类似于我们观察到的短链支化聚乙烯。这些观察结果连同源自 Flory 理论的良好线性关系表明聚乙烯晶体单元中排除了 21 个碳侧链。

更新日期：2015-10-21

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