writer：Xianhu Liu, Meng Lian, Yamin Pan, Xin Wang, Guoqiang Zheng,* Chuntai Liu,* Dirk W. Schubert,
keywords：injection molding
source：期刊
specific source：Macromol. Mater. Eng. 2018, 303, 1700465
Issue time：2018年
Shish-kebab, which is endowed with superior strength and modulus,
provides the potential to fabricate self-reinforced polymer products. However,
the injection-molded product usually exhibits a typical skin–core structure,
and the shish-kebab is only located in an extremely thin shear layer. Therefore,
the controlling and tailoring of crystal structures in complex flow field to
improve the mechanical properties of the injection-molded sample are still a
great challenge. Herein, for the first time, high-density polyethylene sample
with a novel macroscopic alternating skin–core structure is achieved using a
melt multi-injection molding technique. Results show that, with increasing
the amount of melt injection, the layers of skin–core structure increase in
the form of arithmetic progression, and therefore the tensile strength of the
samples progressively increases due to an increase of shish-kebab content.
This study demonstrates a new approach to achieve multilayer homogeneous
materials with excellent tensile strength via macroscopic structural design
during the practical molding process.