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yexuqing木蟲(chóng)之王 (文學(xué)泰斗)
太陽(yáng)系系主任
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[交流]
Degradable thermosets via orthogonal polymerizations of a single monomer
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Degradable thermosets via orthogonal polymerizations of a single monomer 通過(guò)單一單體的正交聚合制備可降解熱固性塑料 ▲ 作者:Reagan J. Dreiling, Kathleen Huynh & Brett P. Fors ▲ 鏈接:https://www.nature.com/articles/s41586-024-08386-w ▲ 摘要:在此,我們提出了一種具有可降解熱固性的一次性合成模塊。它來(lái)自商業(yè)上可行的、生物來(lái)源的單體2,3-二氫呋喃(DHF)。在釕催化劑和光酸發(fā)生器的存在下,DHF進(jìn)行緩慢開(kāi)環(huán)復(fù)分解聚合,得到軟聚合物;然后,暴露在光線下后觸發(fā)強(qiáng)酸生成,促進(jìn)同一DHF單體的陽(yáng)離子聚合,從而產(chǎn)生空間交聯(lián),增加材料強(qiáng)度。通過(guò)操縱催化劑負(fù)載和光照,我們可以獲得具有跨越數(shù)量級(jí)的物理性質(zhì)的材料,并實(shí)現(xiàn)空間分辨率的材料域。 重要的是,基于DHF的熱固性材料經(jīng)過(guò)刺激可以逐漸降解,通過(guò)溫和加熱進(jìn)行回收。在單一官能團(tuán)上使用兩種不同的聚合機(jī)制,可以合成具有精確控制性能的可降解和可回收的熱固性材料。 ▲ Abstract:Here we present a modular, one-pot synthesis of degradable thermosets from the commercially available, biosourced monomer 2,3-dihydrofuran (DHF). In the presence of a ruthenium catalyst and photoacid generator, DHF undergoes slow ring-opening metathesis polymerization to give a soft polymer; then, exposure to light triggers strong acid generation and promotes the cationic polymerization of the same DHF monomer to spatially crosslink and strengthen the material. By manipulating catalyst loading and light exposure, we can access materials with physical properties spanning orders of magnitude and achieve spatially resolved material domains. Importantly, the DHF-based thermosets undergo stimuli-selective degradation and can be recycled to the monomer under mild heating. The use of two distinct polymerization mechanisms on a single functional group allows the synthesis of degradable and recyclable thermoset materials with precisely controlled properties. |

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