Brown Elizabeth, Abdelwahab Mohamed, Valerio Oscar, Misra Manjusri, Mohanty Amar K
Bioproducts Discovery and Development Centre, Department of Plant Agriculture, University of Guelph, Crop Science Building, 50 Stone Road East, Guelph, N1G 2W1, Ontario, Canada.
Department of Chemistry, University of Guelph, 50 Stone Road East, Guelph N1G 2W1, Ontario, Canada.
ACS Omega. 2018 Apr 5;3(4):3857-3867. doi: 10.1021/acsomega.8b00056. eCollection 2018 Apr 30.
Biobased, elastomeric polymer poly(glycerol succinate--maleate) (PGSMA) was produced using a "green" synthesis with added cellulose nanocrystals (CNCs) to create a novel PGSMA-CNC material. PGSMA-CNC was synthesized with the aim of developing a new strategy for successfully dispersing CNCs within a poly(lactic acid) (PLA) matrix for optimal reinforcement of tensile strength and modulus while having the added benefit of the proven toughness enhancements of PLA/PGSMA blends. Optical microscopy and fractionation in tetrahydrofuran showed that CNCs agglomerated during PGSMA-CNC synthesis and remained in agglomerates during PLA/PGSMA-CNC reactive blending. Fourier transform infrared, differential scanning calorimetry, and dynamic mechanical analyses also showed that PGSMA-CNC inhibited the formation of PGSMA crosslinks and PLA--PGSMA during reactive blending. These two effects resulted in loss of impact strength and only a 4% increase in tensile modulus over PLA/PGSMA at the highest CNC content. Further work in preventing CNC aggregation could help improve mechanical properties of the final blend.
采用“绿色”合成法制备了生物基弹性体聚合物聚（甘油琥珀酸酯-马来酸酯）（PGSMA），并添加了纤维素纳米晶体（CNC）以制备新型PGSMA-CNC材料。合成PGSMA-CNC的目的是开发一种新策略，以便成功地将CNC分散在聚乳酸（PLA）基体中，从而最佳地增强拉伸强度和模量，同时还能受益于已证实的PLA/PGSMA共混物韧性增强效果。光学显微镜观察和在四氢呋喃中的分级分离表明，CNC在PGSMA-CNC合成过程中发生团聚，并且在PLA/PGSMA-CNC反应性共混过程中仍保持团聚状态。傅里叶变换红外光谱、差示扫描量热法和动态力学分析还表明，PGSMA-CNC在反应性共混过程中抑制了PGSMA交联和PLA-PGSMA的形成。这两种效应导致冲击强度损失，并且在最高CNC含量下，拉伸模量仅比PLA/PGSMA提高了4%。在防止CNC团聚方面的进一步研究可能有助于改善最终共混物的机械性能。
