Asymmetric Miktoarm Star Polymers as Polyester Thermoplastic Elastomers,Macromolecules

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Asymmetric Miktoarm Star Polymers as Polyester Thermoplastic Elastomers
Macromolecules ( IF 5.1 ) Pub Date : 2022-06-10 , DOI: 10.1021/acs.macromol.2c00214
Jacob R. Blankenship _{1,

2} , Adam E. Levi _{1,

2} , David J. Goldfeld _{1,

2} , Jeffrey L. Self ₁ , Nima Alizadeh ₃ , Duyu Chen ₂ , Glenn H. Fredrickson _{2,

3,

4} , Christopher M. Bates _{1,

2,

3,

4}

Affiliation

A library of polyester-based A(BA′)_n asymmetric miktoarm star polymers was synthesized with A, A′ = poly(l-lactide) (PLLA) as the semicrystalline hard blocks and B = poly(4-methylcaprolactone) (PMCL) as the soft segment using a grafting-through platform known as μSTAR. The synthetic versatility of μSTAR enabled a systematic investigation of architectural design parameters, in particular the number of BA′ arms (n), while holding the A, A′, and B block lengths constant. The value of n has a pronounced impact on the mechanical properties of these high-molecular-weight miktoarm materials. Tensile toughness increases with n, an effect likely related to bridging, as the modulus drops because the hard-block volume fraction decreases. These insights expand our understanding of architecture effects in sustainable thermoplastic elastomers.

中文翻译：

作为聚酯热塑性弹性体的不对称 Miktoarm Star 聚合物

合成了基于聚酯的 A(BA') _n不对称 miktoarm 星形聚合物库，其中 A, A' = 聚 ( l-丙交酯) (PLLA) 作为半结晶硬嵌段，B = 聚 (4-甲基己内酯) (PMCL)作为使用称为μSTAR的嫁接平台的软段。μSTAR 的综合多功能性能够对架构设计参数进行系统研究，特别是 BA' 臂 ( n ) 的数量，同时保持 A、A' 和 B 块长度不变。n的值对这些高分子量微型武器材料的机械性能有显着影响。拉伸韧性随n增加，一种可能与桥接有关的影响，因为硬块体积分数降低，模量下降。这些见解扩展了我们对可持续热塑性弹性体结构效应的理解。

更新日期：2022-06-10

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