Macromolecular Engineering and Additive Manufacturing of Poly(styrene-b-isobutylene-b-styrene),ACS Applied Polymer Materials

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Macromolecular Engineering and Additive Manufacturing of Poly(styrene-b-isobutylene-b-styrene)
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2021-08-10 , DOI: 10.1021/acsapm.1c00616
Naifu Shen ₁ , Shan Liu ₁ , Pratik Kasbe ₁ , Fardin Khabaz ₁ , Joseph P. Kennedy ₁ , Weinan Xu ₁

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Although polyisobutylene (PIB)-based thermoplastic elastomers (TPEs) possess a combination of unique properties (i.e., low permeability, high environmental and chemical stability, and excellent biocompatibility), they have not been explored for 3D printing. Poly(styrene-b-isobutylene-b-styrene) (SIBS) is one of the most important PIB-based TPEs used in biomedical applications. Herein, we report, for the first time, the development of an efficient and low-cost 3D printing strategy of SIBS by fine-tuning its microstructure and properties. We discovered that blending the polystyrene (PS) homopolymer with SIBS leads to significant changes in its microphase-separated structure. The amount and molecular weight of the added PS significantly affect the micromorphology and 3D printability of SIBS/PS blends. In particular, SIBS/PS blends with high molecular weight PS at relatively high weight fractions show a unique hierarchical salami micromorphology with appropriate properties (improved hardness, modulus, and thermal stability) for 3D printing by fused filament fabrication. SIBS/PS blends with PS molecular weight close to or higher than that of SIBS show better printability than blends with low molecular weight PS. Blending the PIB block copolymer with the homopolymer of its hard block is an efficient and cost-effective strategy for additive manufacturing of PIB-based elastomers with widely tunable properties.

中文翻译：

聚（苯乙烯-b-异丁烯-b-苯乙烯）的高分子工程与增材制造

尽管基于聚异丁烯 (PIB) 的热塑性弹性体 (TPE) 具有独特的性能（即低渗透性、高环境和化学稳定性以及出色的生物相容性），但尚未对其进行 3D 打印探索。聚（苯乙烯- b -isobutylene- b-苯乙烯) (SIBS) 是生物医学应用中最重要的基于 PIB 的 TPE 之一。在此，我们首次报告了通过微调 SIBS 的微观结构和性能，开发了一种高效且低成本的 SIBS 3D 打印策略。我们发现将聚苯乙烯 (PS) 均聚物与 SIBS 混合会导致其微相分离结构发生显着变化。添加 PS 的量和分子量显着影响 SIBS/PS 共混物的微观形态和 3D 可打印性。特别是，SIBS/PS 与高分子量 PS 以相对较高的重量分数混合显示出独特的分层意大利腊肠微观形态，具有适用于通过熔丝制造进行 3D 打印的适当特性（提高的硬度、模量和热稳定性）。PS 分子量接近或高于 SIBS 的 SIBS/PS 共混物显示出比低分子量 PS 共混物更好的印刷适性。将 PIB 嵌段共聚物与其硬嵌段的均聚物共混是一种高效且具有成本效益的策略，可用于增材制造具有广泛可调性能的 PIB 基弹性体。

更新日期：2021-09-10

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