Enhanced Crystallization Rate of Poly(l -lactide) Mediated by a Hydrazide Compound: Nucleating Mechanism Study

• DOI: 10.1002/macp.201500002
• Publication Date: 2015-04-02T21:09:57Z
• Authors: Qian Xing; Rongbo Li; Xia Dong; Faliang Luo; Xiao Kuang; Dujin Wang; Liaoyun Zhang
• Keywords: Lactide; Helix (gastropod)

A low molecular weight hydrazide compound, tetramethylenedicarboxylic di (2-hydroxybenzohydrazide) (TMBH), greatly improves the crystallization rate and crystallinity of poly(l-lactide) (PLLA). The nucleating efficiency TMBH on PLLA exhibits obvious concentration dependence, which increases first then decreases slightly with increase loading, reaching a maximum at 0.3 wt%. Time-resolved Fourier transform infrared spectroscopy spectra indicate that formation skeletal conformational ordering structure has been accelerated in presence TMBH, can act as efficient precursors speeding up both nucleation surface intrachain 103 helix structure. possible hydrogen bonding interaction between OH or NH groups CO backbones is supposed to be an important factor, promotes migration chains crystallites emergence interchain interactions well ordering.