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yexuqing木蟲之王 (文學泰斗)
太陽系系主任
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[交流]
Stereomicrostructure-regulated biodegradable adhesives 已有1人參與
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Stereomicrostructure-regulated biodegradable adhesives 立體微結構調(diào)節(jié)的可生物降解膠粘劑 ▲ 作者:ZHEN ZHANG, ETHAN C. QUINN, JACOB K. KENNY, ALEXANDRA GRIGOROPOULOS, JASON S. DESVEAUX, TIFFANY CHEN, LI ZHOU, TING XU, GREGG T. BECKHAM, AND EUGENE Y.-X. CHEN ▲鏈接: https://www.science.org/doi/10.1126/science.adr7175 ▲摘要: 從膠帶到膠水,粘合劑被廣泛應用于各種場合。大多數(shù)是典型的石油基熱固性網(wǎng)絡或不可生物降解的熱塑性熱熔膠。研究者使用一組釔基、鑭基和磷基催化劑合成了一系列具有不同分子量、微觀結構和戰(zhàn)術的聚合物——聚3-羥基丁酸酯(P3HBs)。 非晶聚合物往往更粘,但也更弱,而晶體聚合物在流動和填充表面不規(guī)則性方面很差,而這是形成強鍵的關鍵。研究者發(fā)現(xiàn),半結晶的富二代P3HB不僅提供了最好的附著力,而且還優(yōu)于許多商業(yè)替代品。由于P3HBs能夠由細菌產(chǎn)生,并且可以生物降解,因此有可能以可持續(xù)的方式生產(chǎn)這些粘合劑。 ▲ Abstract: From tapes to glues, adhesives are used in a wide range of applications and situations. Most are typically petroleum-based thermoset networks or nonbiodegradable thermoplastic hot melts. Zhang et al. used a set of yttrium-, lanthanum-, and phosphorus-based catalysts to synthesize a series of poly(3-hydroxybutyrate) polymers (P3HBs) with different molecular weights, microstructures, and tacticities. Amorphous polymers tend to be stickier but also weaker, whereas crystalline ones are poor at flowing and filling surface irregularities, which is key to forming a strong bond. The authors found that semicrystalline syndio-rich P3HB not only provides the best adhesion, but can also outperform many commercial alternatives. Because P3HBs are able to be produced by bacteria and can be biodegradable, it may be possible to produce these adhesives in a sustainable way. |

新蟲 (小有名氣)
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