TY - JOUR
T1 - Polylactide Single-Polymer Composites with a Wide Melt-Processing Window Based on Core-Sheath PLA Fibers
AU - Liu, Qingsheng
AU - Zhao, Mingming
AU - Zhou, Yuqi
AU - Yang, Qibing
AU - Shen, Ying
AU - Gong, Rong
AU - Zhou, Fenglei
AU - Li, Yuhao
AU - Deng, Bingyao
PY - 2018/2/5
Y1 - 2018/2/5
N2 - Polylactide (PLA) single polymer composites (SPCs) were prepared using PLA nonwovens made of core-sheath PLA fibers as raw materials by hot-pressing. The core and sheath materials were poly(L-lactide) (PLLA) and PLA with D-lactide of about 10 mol% (PLA90), respectively. The melt processing window of PLA SPCs reached more than 40oC. The effects of hot-pressing temperature on the crystallinity, the size distribution of crystallites, the lamellar thickness and mechanical property of PLA SPCs were significant while those of hot-pressing pressure were small. The strong interfacial adhesion between matrix and reinforcement led to high mechanical properties of PLA SPCs. For pure PLA materials prepared at 180oC, the tensile strength (b), elongation at break (εb), the work of rupture (W) and impact strength (αcU) were only 19MPa, 1.8%, 0.15J, and 2.8kJ/m2, respectively while those of the SPCs prepared at 130~160oC were 47~65MPa, 15~32%, 9~22J, and 14.9~67.2kJ/m2, respectively. With the increase of hot-pressing temperature, the b, W and αcU decreased.
AB - Polylactide (PLA) single polymer composites (SPCs) were prepared using PLA nonwovens made of core-sheath PLA fibers as raw materials by hot-pressing. The core and sheath materials were poly(L-lactide) (PLLA) and PLA with D-lactide of about 10 mol% (PLA90), respectively. The melt processing window of PLA SPCs reached more than 40oC. The effects of hot-pressing temperature on the crystallinity, the size distribution of crystallites, the lamellar thickness and mechanical property of PLA SPCs were significant while those of hot-pressing pressure were small. The strong interfacial adhesion between matrix and reinforcement led to high mechanical properties of PLA SPCs. For pure PLA materials prepared at 180oC, the tensile strength (b), elongation at break (εb), the work of rupture (W) and impact strength (αcU) were only 19MPa, 1.8%, 0.15J, and 2.8kJ/m2, respectively while those of the SPCs prepared at 130~160oC were 47~65MPa, 15~32%, 9~22J, and 14.9~67.2kJ/m2, respectively. With the increase of hot-pressing temperature, the b, W and αcU decreased.
KW - polylactide; core-sheath fibers
KW - single polymer composites
KW - melt-processing window
U2 - 10.1016/j.matdes.2017.10.066
DO - 10.1016/j.matdes.2017.10.066
M3 - Article
SN - 0264-1275
VL - 139
SP - 36
EP - 44
JO - Materials & Design
JF - Materials & Design
ER -