Solid State Orientation of Thermoplastic Vulcanizates
Solid State Orientation of Thermoplastic Vulcanizates
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热塑性硫化橡胶的固态取向
DOI：
10.1002/mame.202200279
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发表时间：
2022
影响因子：
3.9
通讯作者：
Innes J
中科院分区：
文献类型：
--
作者：
Innes J
模头拉伸通过聚合物链的取向来生产具有上级机械性能的聚合物产品。尽管已经针对各种热塑性塑料和复合材料研究了该方法，但是目前还没有出版物探索其增强热塑性硫化橡胶（TPV）的功效。TPV联合收割机结合了热固性材料的弹性和高断裂伸长率，同时保持了热塑性材料的可加工性。首次对热塑性弹性体进行了模拉伸，并研究了模拉伸对热塑性弹性体力学性能和热性能的影响。使用双螺杆挤出机通过动态硫化制备基于三元乙丙橡胶（EPDM）和聚丙烯（PP）以及轮胎橡胶粉（GTR）和PP的热塑性硫化弹性体。在所有情况下，模具拉伸导致材料的拉伸强度和模量沿拉伸方向沿着增加，通常以断裂伸长率为代价。在拉伸比为2时，EPDM/PP TPV超过纯聚丙烯的强度和模量，同时保持超过200%的断裂伸长率。对于EPDM/PP，拉伸强度使用4的拉伸比从1.21 MPa增加到超过90 MPa，而对于GTR/PP，这从1.15增加到1.57 MPa。
Die drawing has been used to produce polymeric products with superior mechanical properties by orientation of polymer chains. Although this process has been studied for a variety of thermoplastics and composites, there are no current publications exploring its efficacy to enhance thermoplastic vulcanizates (TPVs). TPVs combine the elasticity and high elongation at break of thermosets while maintaining the processability of a thermoplastic. For the first time, TPVs are die drawn and the effect upon their mechanical and thermal properties is investigated. TPVs based upon ethylene propylene diene monomer (EPDM) and polypropylene (PP) as well as ground tyre rubber (GTR) and PP are prepared by dynamic vulcanization using a twin‐screw extruder. In all cases, die drawing leads to an increase in tensile strength and modulus of the material along the drawing direction, often at the cost of elongation at break. At a draw ratio of 2, EPDM/PP TPVs exceed the strength and modulus of neat polypropylene whilst maintaining an elongation at break in excess of 200%. For EPDM/PP, tensile strength increases from ≈21 MPa to over 90 MPa using a draw ratio of 4, whilst for GTR/PP this increases from ≈15 to ≈57 MPa.