Effect of preparation method on the properties of polylactide/cellulose nanocrystal nanocomposites,Polymer Composites

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Effect of preparation method on the properties of polylactide/cellulose nanocrystal nanocomposites
Polymer Composites ( IF 4.8 ) Pub Date : 2020-06-29 , DOI: 10.1002/pc.25701
Dogan Arslan ₁ , Emre Vatansever ₂ , Deniz Sema Sarul ₂ , Yusuf Kahraman ₁ , Gurbuz Gunes ₃ , Ali Durmus ₄ , Mohammadreza Nofar _{1,

2}

Affiliation

Polylactide (PLA)/cellulose nanocrystal (CNC) nanocomposites with 1, 3, and 5 wt% CNC contents were prepared through (a) solution casting and (b) dilution of solution‐casted PLA/CNC masterbatch though melt mixing in a twin‐screw extruder. The effect of preparation method on the CNC dispersion quality and hence the final properties of the nanocomposites were studied. A better CNC dispersion within PLA was obtained when using solution casting method, whereas the formation of CNC agglomerates was observed in the melt‐processed nanocomposites. The rheological results confirmed that a solid network was formed at the CNC content of around 3 wt% in the solution‐casted samples. The PLA crystallization could also be enhanced differently in the presence of CNC nanoparticles through various preparation routes. Moreover, the CNC incorporation noticeably enhanced the storage modulus of PLA beyond its glass transition temperature. The oxygen permeability of PLA was also remarkably reduced with CNC by employing both methods.

中文翻译：

制备方法对聚丙交酯/纤维素纳米晶体纳米复合材料性能的影响

通过（a）溶液浇铸和（b）通过在双螺杆中熔融混合将溶液浇铸的PLA / CNC母料稀释来制备具有1、3和5 wt％CNC含量的聚乳酸（PLA）/纤维素纳米晶体（CNC）纳米复合材料。螺杆挤出机。研究了制备方法对CNC分散体质量的影响，从而研究了纳米复合材料的最终性能。当采用溶液流延法时，在PLA中获得了更好的CNC分散性，而在熔融加工的纳米复合材料中观察到了CNC团聚体的形成。流变学结果证实，在溶液浇铸样品中，CNC含量约为3 wt％时形成了牢固的网络。在存在CNC纳米粒子的情况下，通过各种制备途径，PLA结晶也可以得到不同的增强。此外，CNC加入后，PLA的储能模量显着提高，超过了其玻璃化转变温度。通过使用这两种方法，CNC还可以显着降低PLA的透氧性。

更新日期：2020-06-29

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