Funding for this research was provided by:
Department of Education of Shandong Province (2018GSF117019)
ey Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics (KF201704)
Article History
Received: 29 January 2019
Accepted: 26 April 2019
First Online: 6 May 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.