Effects of polyvinylpyrrolidone on the crystallization of amorphous griseofulvin: fracture and molecular mobility

IF 5.2 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Yanan Wang, Chai-Yee Chin, Naveen Kumar Hawala Shivashekaregowda, Qin Shi
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Abstract

This study aims to investigate the fracture, molecular mobility and crystallization behaviors of amorphous griseofulvin (GSF) in the presence of polyvinylpyrrolidone (PVP). In the presence of 10%(w/w) PVP K90, the fracture resistance of griseofulvin was greatly improved. Compared with the pure GSF system, the average fracture temperature of the griseofulvin–PVP K90 system was decreased to approximately −6.1°C. More importantly, a statistical study revealed that the direct connection between fracture and nucleation of griseofulvin was weakened in the presence of PVP K90. This study also explored the effects of PVP K90 on the molecular dynamics and crystallization behaviors of amorphous GSF. In the presence of PVP K90, the crystal growth kinetics and molecular dynamics were both slowed down. Interestingly, needle-like crystal growth was observed, exhibiting approximately the same rates as the bubble-induced process. These findings are important for understanding the complex mechanisms of physical stability of polymer-based amorphous solid dispersions.

Abstract Image

聚乙烯吡咯烷酮对无定形格列齐芬结晶的影响:断裂和分子流动性
本研究旨在探讨聚乙烯吡咯烷酮(PVP)存在下无定形格列卫(GSF)的断裂、分子迁移和结晶行为。在 10%(w/w) PVP K90 的存在下,格列齐芬的抗断裂性大大提高。与纯 GSF 体系相比,草铵膦-PVP K90 体系的平均断裂温度降至约 -6.1°C。更重要的是,一项统计研究显示,在 PVP K90 的存在下,格列卫断裂与成核之间的直接联系被削弱。本研究还探讨了 PVP K90 对无定形 GSF 分子动力学和结晶行为的影响。在 PVP K90 的存在下,晶体生长动力学和分子动力学均有所减慢。有趣的是,观察到针状晶体生长,其速率与气泡诱导过程大致相同。这些发现对于理解聚合物基无定形固体分散体物理稳定性的复杂机制非常重要。
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来源期刊
Journal of Applied Crystallography
Journal of Applied Crystallography CHEMISTRY, MULTIDISCIPLINARYCRYSTALLOGRAPH-CRYSTALLOGRAPHY
CiteScore
7.80
自引率
3.30%
发文量
178
期刊介绍: Many research topics in condensed matter research, materials science and the life sciences make use of crystallographic methods to study crystalline and non-crystalline matter with neutrons, X-rays and electrons. Articles published in the Journal of Applied Crystallography focus on these methods and their use in identifying structural and diffusion-controlled phase transformations, structure-property relationships, structural changes of defects, interfaces and surfaces, etc. Developments of instrumentation and crystallographic apparatus, theory and interpretation, numerical analysis and other related subjects are also covered. The journal is the primary place where crystallographic computer program information is published.
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