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具有聚（L-乳酸）和过渡金属二硫属化物纳米片2D-TMDCs WS的纳米复合材料

Nanocomposite Materials with Poly(l-lactic Acid) and Transition-Metal Dichalcogenide Nanosheets 2D-TMDCs WS.

作者信息

Naffakh Mohammed, Fernández Miriam, Shuttleworth Peter S, García Ana M, Moreno Diego A

机构信息

Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid (ETSII-UPM), José Gutiérrez Abascal 2, 28006 Madrid, Spain.

Instituto de Ciencia y Tecnología de Polímeros (ICTP-CSIC), Juan de la Cierva 3, 28006 Madrid, Spain.

出版信息

Polymers (Basel). 2020 Nov 16;12(11):2699. doi: 10.3390/polym12112699.

DOI:10.3390/polym12112699
PMID:33207692
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7698076/
Abstract

Layered transition-metal dichalcogenides (TMDCs) based on tungsten disulfide nanosheets (2D-WS) were introduced via melt processing into poly(l-lactic acid) (PLLA) to generate PLLA/2D-WS nanocomposite materials. The effects of the 2D-WS on the morphology, crystallization, and biodegradation behavior of PLLA were investigated. In particular, the non-isothermal melt-crystallization of neat PLLA and PLLA/2D-WS nanocomposites were analyzed in detail by varying both the cooling rate and 2D-WS loading. The kinetic parameters of PLLA chain crystallization are successfully described using the Liu model. It was found that the PLLA crystallization rate was reduced with 2D-WS incorporation, while the crystallization mechanism and crystal structure of PLLA remained unchanged in spite of nanoparticle loading. This was due to the PLLA chains not being able to easily adsorb on the WS nanosheets, hindering crystal growth. In addition, from surface morphology analysis, it was observed that the addition of 2D-WS facilitated the enzymatic degradation of poorly biodegradable PLLA using a promising strain of actinobacteria, . The identification of more suitable enzymes to break down PLLA nanocomposites will open up new avenues of investigation and development, and it will also lead to more environmentally friendly, safer, and economic routes for bioplastic waste management.

摘要

通过熔融加工将基于二硫化钨纳米片（2D-WS）的层状过渡金属二硫属化物引入聚（L-乳酸）（PLLA）中，以制备PLLA/2D-WS纳米复合材料。研究了2D-WS对PLLA的形态、结晶和生物降解行为的影响。特别是，通过改变冷却速率和2D-WS负载量，详细分析了纯PLLA和PLLA/2D-WS纳米复合材料的非等温熔融结晶过程。利用Liu模型成功描述了PLLA链结晶的动力学参数。结果发现，加入2D-WS后PLLA的结晶速率降低，尽管有纳米颗粒负载，但PLLA的结晶机理和晶体结构保持不变。这是由于PLLA链不易吸附在WS纳米片上，阻碍了晶体生长。此外，通过表面形态分析观察到，使用一种有前景的放线菌菌株，2D-WS的添加促进了难生物降解的PLLA的酶促降解。鉴定更合适的酶来分解PLLA纳米复合材料将开辟新的研究和开发途径，也将为生物塑料废物管理带来更环保、更安全和更经济的途径。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/b73903b7a77f/polymers-12-02699-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/fb78a7e9bdc5/polymers-12-02699-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/a9df2069ea59/polymers-12-02699-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/18f7370c0ff8/polymers-12-02699-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/bb59780fc3d9/polymers-12-02699-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/b567dd334c83/polymers-12-02699-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/40569b0cf5b1/polymers-12-02699-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/d7d5a02d8a75/polymers-12-02699-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/434903305490/polymers-12-02699-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/b73903b7a77f/polymers-12-02699-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/fb78a7e9bdc5/polymers-12-02699-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/a9df2069ea59/polymers-12-02699-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/18f7370c0ff8/polymers-12-02699-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/bb59780fc3d9/polymers-12-02699-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/b567dd334c83/polymers-12-02699-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/40569b0cf5b1/polymers-12-02699-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/d7d5a02d8a75/polymers-12-02699-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/434903305490/polymers-12-02699-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7c6e/7698076/b73903b7a77f/polymers-12-02699-g009.jpg

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