Enhanced
Crystallization Rate of Poly(l‑lactic
acid) (PLLA) by Polyoxymethylene (POM) Fragment Crystals in the PLLA/POM
Blends with a Small Amount of POM
Jishan Qiu
Jipeng Guan
Hengti Wang
Shanshan Zhu
Xiaojun Cao
Quan-lin Ye
Yongjin Li
10.1021/jp412519g.s001
https://acs.figshare.com/articles/journal_contribution/Enhanced_Crystallization_Rate_of_Poly_l_lactic_acid_PLLA_by_Polyoxymethylene_POM_Fragment_Crystals_in_the_PLLA_POM_Blends_with_a_Small_Amount_of_POM/2279419
Phase diagrams and glass transition
behaviors of poly(l-lactic acid)/polyoxymethylene (PLLA/POM)
blends have been investigated
in our previous work (<i>Macromolecules</i> <b>2013</b>, <i>46</i>, 5806–5814). In this work, the crystallization
behaviors and physical properties of the PLLA/POM blends with the
PLLA as the major component have been systematically studied. POM
was crystallized into the fragment crystals that were finely dispersed
in the PLLA matrix when cooling down from the melt of the blends.
It was found that the POM fragment crystals accelerated the crystallization
process of PLLA matrix and increased the final crystallinity of PLLA
significantly in the blends. At the same time, the PLLA spherulites
nucleated by POM fragment crystals were much smaller than those obtained
from neat PLLA. It was further found that the crystallization rate
of PLLA was quite dependent upon the POM loadings and the highest
crystallization rate was observed at POM loadings of 7 wt %. It is
considered that the POM fragment crystals take the nuclei role to
initiate the crystallization of PLLA at low POM loadings, while a
high content of POM in the blends leads to the large POM spherulites
that cannot nucleate PLLA crystallization effectively. The obtained
PLLA/POM blends at low POM loadings with small PLLA spherulites exhibited
excellent optical transmittance and good mechanical performance.
2014-06-26 00:00:00
POM loadings
PLLA matrix
glass transition behaviors
nucleate PLLA crystallization
PLLA spherulites
crystallization rate
Enhanced Crystallization Rate
POM fragment crystals
blend