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Crystallization and properties of nucleated poly(l-lactic acid): Effect of cyclopentanecarboxylic acid derivative as a new nucleating agent
Journal of Thermoplastic Composite Materials ( IF 3.3 ) Pub Date : 2021-03-15 , DOI: 10.1177/08927057211001921
Lisha Zhao 1 , Xuhua Liu 1 , Yanhua Cai 1 , Wei Chen 1
Affiliation  

In this study, the potential effects of N, N’-dodecanedioic bis(cyclopentanecarboxylic acid) dihydrazide (BCADD) as a new additive in poly(L-lactic acid) (PLLA) was estimated. The comparative study on the melt-crystallization showed that the BCADD as heterogeneous nuclei facilitated crystallization of PLLA in cooling, which indicated by the obvious crystallization exotherms and sharp melt-crystallization peak. Unfortunately, with increasing of BCADD from 0.5 wt% to 3 wt%, it is unexpected that the melt-crystallization peak of the BCADD-nucleated PLLA shifted toward the lower temperature and became flatter, evidencing the importance of BCADD loading for PLLA’s crystallization. Additionally, the cooling rate and the final melting temperature were also proved to be important influence factors during PLLA’s melt-crystallization process, but in contrast with the effect of the final melting temperature on the melt-crystallization, a higher cooling rate could more seriously weaken crystallization ability of the BCADD-nucleated PLLA. The chemical nucleation mechanism was proposed to explain the promoting effect of BCADD on the crystallization of PLLA via the analysis of frontier orbital energy. The melting behaviors after crystallization further confirmed the crystallization accelerating role of BCADD, and the melting behaviors were affected by the heating rate, crystallization temperature and BCADD loading. Although the onset thermal decomposition of the BCADD-nucleated PLLA occurred at lower temperature comparing with the pure PLLA, the intermolecular interaction of PLLA with BCADD attempted to prevent the decrease of thermal stability. Overall, the addition of BCADD resulted in the complicated effect on the tensile modulus and tensile strength of PLLA, but the elongation at break continuously decreased when increasing BCADD loading.



中文翻译:

结晶和有核聚性能(-乳酸):环戊烷羧酸衍生物的效果作为一种新的成核剂

在这项研究中,N,N'的潜在影响估计了十二烷二酸双(环戊烷羧酸)二酰肼(BCADD)作为聚(L-乳酸)(PLLA)中的新添加剂。熔体结晶的比较研究表明,BCADD为异质核,在冷却过程中促进了PLLA的结晶,这表现为明显的结晶放热和尖锐的熔体结晶峰。不幸的是,随着BCADD从0.5重量%增加到3重量%,出乎意料的是BCADD成核的PLLA的熔体结晶峰移向了较低的温度并变得更平坦,这证明了BCADD负载对于PLLA结晶的重要性。此外,冷却速度和最终熔化温度也被证明是PLLA熔融结晶过程中的重要影响因素,但与最终熔化温度对熔体结晶的影响相反,较高的冷却速度会更严重地削弱BCADD成核的PLLA的结晶能力。提出了化学成核机理来解释BCADD对PLLA结晶的促进作用。通过对前沿轨道能量的分析。结晶后的熔融行为进一步证实了BCADD的结晶促进作用,并且熔融行为受加热速率,结晶温度和BCADD载荷的影响。尽管与纯PLLA相比,BCADD成核的PLLA的起始热分解发生在较低的温度下,但PLLA与BCADD的分子间相互作用试图阻止热稳定性的降低。总体而言,添加BCADD会对PLLA的拉伸模量和拉伸强度产生复杂的影响,但是当增加BCADD载荷时,断裂伸长率会持续降低。

更新日期:2021-03-16
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