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Green and High-Expansion PLLA/PDLA Foams with Excellent Thermal Insulation and Enhanced Compressive Properties
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-10-19 , DOI: 10.1021/acs.iecr.0c02492 Zhihui Yan 1 , Xia Liao 1, 2 , Guangjian He 2 , Shaojie Li 1 , Fumin Guo 1 , Fangfang Zou 1 , Guangxian Li 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-10-19 , DOI: 10.1021/acs.iecr.0c02492 Zhihui Yan 1 , Xia Liao 1, 2 , Guangjian He 2 , Shaojie Li 1 , Fumin Guo 1 , Fangfang Zou 1 , Guangxian Li 1
Affiliation
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Thermal insulation polylactide (PLA) foams with high compressive strength were successfully fabricated by combining a modified cooling batch foaming method and introduction of stereocomplex (SC) crystallites. It was found that the highest expansion ratio and the lowest thermal conductivity of pure poly(l-lactide) (PLLA) foams were 48 and 31.2 mW/(m·K), respectively. Besides a high expansion ratio, high compressive strength was important as well for thermal insulation foams but still challenging with pure PLLA foams. Therefore, SC crystallites were introduced to the matrix by mixing asymmetrical poly(d-lactide) (PDLA) and PLLA. According to scanning electron microscopy (SEM) results, SC crystallites could improve the cellular morphology and increase the expansion ratio at high foaming temperatures. The compressive performance and thermal conductivity of PLLA/PDLA foams were also investigated. PLLA/PDLA foams showed similar thermal insulation properties and largely enhanced mechanical properties compared to pure PLLA foams. In addition, the annealing process increased the crystallinity of PLA foams, which further improved their compressive properties. For foams with the same content of SC crystallites, the compressive modulus increased by 72% after annealing.
中文翻译：
绿色和高膨胀PLLA / PDLA泡沫，具有出色的隔热性和增强的压缩性能
通过结合改进的冷却分批发泡方法和引入立体复合物（SC）晶体，成功制造了具有高抗压强度的隔热聚乳酸（PLA）泡沫。发现纯聚（l-丙交酯）（PLLA）泡沫的最高膨胀率和最低导热率分别为48和31.2 mW /（m·K）。除了高膨胀率外，高压缩强度对隔热泡沫也很重要，但对于纯PLLA泡沫仍然具有挑战性。因此，通过混合不对称聚（d-丙交酯）（PDLA）和PLLA将SC微晶引入基质。根据扫描电子显微镜（SEM）结果，SC晶体可以改善泡沫形态，并在高发泡温度下增加膨胀率。还研究了PLLA / PDLA泡沫的压缩性能和热导率。与纯PLLA泡沫相比，PLLA / PDLA泡沫具有相似的隔热性能，并且机械性能大大提高。此外，退火过程提高了PLA泡沫的结晶度，从而进一步提高了其压缩性能。对于具有相同SC晶体含量的泡沫，退火后压缩模量增加了72％。
更新日期：2020-10-29
中文翻译：
绿色和高膨胀PLLA / PDLA泡沫，具有出色的隔热性和增强的压缩性能
通过结合改进的冷却分批发泡方法和引入立体复合物（SC）晶体，成功制造了具有高抗压强度的隔热聚乳酸（PLA）泡沫。发现纯聚（l-丙交酯）（PLLA）泡沫的最高膨胀率和最低导热率分别为48和31.2 mW /（m·K）。除了高膨胀率外，高压缩强度对隔热泡沫也很重要，但对于纯PLLA泡沫仍然具有挑战性。因此，通过混合不对称聚（d-丙交酯）（PDLA）和PLLA将SC微晶引入基质。根据扫描电子显微镜（SEM）结果，SC晶体可以改善泡沫形态，并在高发泡温度下增加膨胀率。还研究了PLLA / PDLA泡沫的压缩性能和热导率。与纯PLLA泡沫相比，PLLA / PDLA泡沫具有相似的隔热性能，并且机械性能大大提高。此外，退火过程提高了PLA泡沫的结晶度，从而进一步提高了其压缩性能。对于具有相同SC晶体含量的泡沫，退火后压缩模量增加了72％。
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