Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 750, Issue -, Pages 197-205Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.03.301
Keywords
Calcium sulfate whisker; Coupling agent; Surface modification; Mechanical properties; Poly(vinyl chloride)
Categories
Funding
- National Natural Science Foundation of China [U 1507123]
- Foundation from Qinghai Science and Technology Department [2017-HZ-803]
- Thousand Talents Program of Qinghai Province
- Kunlun Scholar Award Program of Qinghai Province
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In this study, calcium sulfate whisker (CSW) was modified with a newly synthesized polyether titanate coupling agent (eTi(4000)) and four commercial coupling agents, including two silane coupling agents (KH560 and KH570) and two titanate coupling agents (KR38S and KR138S), respectively, and then the modified calcium whisker (mCSW) was incorporated into poly(vinyl chloride) (PVC) by melt blending to prepare mCSW/PVC composites. The morphologies, mechanical properties and thermal stability of these mCSW/PVC composites were compared. The results reveal that the four commercial coupling agents have slightly better reinforcing effect, while eTi(4000) shows much better toughening effect. Moreover, the mCSW/PVC composite modified by eTi(4000) shows higher storage modulus than those modified by commercial coupling agents in dynamic stress mode. The energy dissipation mechanism of these mCSW/PVC composites during the impact process was analyzed, and their interfacial interactions were evaluated quantitatively by the damping ratio. The mCSW/PVC composite modified by eTi(4000) exhibits better thermal stability than their counterparts modified by the commercial coupling agents. Generally, eTi(4000) is an effective coupling agent for CSW, and it can endow mCSW/PVC composites with better balanced properties. (C) 2018 Elsevier B.V. All rights reserved.
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