|
- 2018
发泡CaCO3/杜仲胶形状记忆复合材料的制备与表征
|
Abstract:
天然杜仲胶的反式有序性结构使其具有较强的结晶能力,交联程度较低时可用作形状记忆材料。本文以热膨胀物理微球Expancel 920DU40为发泡剂制备了发泡CaCO3/杜仲胶(EUG)形状记忆复合材料,采用SEM、FTIR、DSC、DMA和万能材料试验机等对Expancel 920DU40的组分及受热膨胀特性和不同交联程度的CaCO3/EUG形状记忆复合材料的结晶熔融行为、微观形貌、形状记忆行为及力学性能进行了表征。结果表明,Expancel 920DU40的外壳为丙烯腈均聚物或与其他单体的共聚物,内部为液态烷烃; CaCO3/EUG形状记忆复合材料的力学性能与其交联程度和发泡程度有关;随着交联程度的增加,EUG的结晶和熔融温度降低,形变率、形状固定率和形状回复率均降低,当S用量为0.8 g时形状记忆性能最佳;调控交联程度可以获得具备不同形状记忆能力的CaCO3/EUG形状记忆复合材料。 Natural eucommia ulmoides gum (EUG) is in crystallized state due to its ordered trans-molecular structure, and it can be used as shape memory materials with low crosslink density. The foamed CaCO3/EUG shape memory composites was prepared using Expancel 920DU40 as the foaming agent. The components and foaming properties of Expancel 920DU40 and the crystallization and melting behaviors, microstructure, shape memory properties and mechanical performance of foamed CaCO3/EUG shape memory composites were measured by SEM, FTIR, DSC, DMA and the universal material testing machine. The results show that the shell of Expancel 920DU40 is composed of acrylonitrile and its copolymer with other monomer, and its interior is filled with liquid alkanes. The mechanical performance of foamed CaCO3/EUG shape memory composites is related to their crosslink density and foaming extent. The melting temperature and crystalline degree of EUG and deformation rate, shape fixity ratio and shape recovery ratio of foamed CaCO3/EUG shape memory composites all decrease with the increase of crosslink density. When sulfur content is 0.8 g, the foamed CaCO3/EUG composite exhibites the best shape memory properties. The foamed CaCO3/EUG shape memory composites with various shape memory abilities can be prepared via controlling their crosslink density. 国家自然科学基金青年科学基金(51303092);国家自然科学基金(51273098/E0302)
[1] | BEHL M, LENDLEIN A. Shape-memory polymers[J]. Materials Today, 2007, 10(4):20-28. |
[2] | LENG J, LAN X, LIU Y. Shape-memory polymers and their composites:Stimulus methods and applications[J]. Progress in Materials Science, 2011, 56(7):1077-1135. |
[3] | HU J, ZHU Y, HUANG H. Recent advances in shape-memory polymers:Structure, mechanism, functionality, modeling and applications[J]. Progress in Polymer Science, 2012, 37(12):1720-1763. |
[4] | XIE T. Recent advances in shape memory polymers[J]. Polymer, 2011, 52(22):4985-5000. |
[5] | 严瑞芳. 一种古老而又年轻的天然高分子-杜仲胶[J]. 高分子通报, 1989(2):39-44. YAN Ruifang. An age-old and young natural polymer-gutta-percha[J]. China Polymer Bulletin, 1989(2):39-44(in Chinese). |
[6] | 张继川, 薛兆宏, 严瑞芳, 等. 天然高分子材料-杜仲胶的研究进展[J]. 高分子学报, 2011(10):1105-1117. ZHANG Jichuan, XUE Zhaohong, YAN Ruifang, et al. Natural polymer material-recent studies on Eucommia ulmoides gum[J]. Acta Polymerica Sinica, 2011(10):1105-1117(in Chinese). |
[7] | ZHANG X, CHENG C, ZHANG M, et al. Effect of alkali and enzymatic pretreatments of Eucommia ulmoides leaves and barks on the extraction of gutta percha[J]. Journal of Agricultural and Food Chemistry, 2008, 56(19):8936-8943. |
[8] | XIA L, WANG Y, LU N, et al. Facile fabrication of shape memory composites from natural Eucommia rubber and high density polyethylene[J]. Polymer International, 2017, 66(5):653-658. |
[9] | XIA L, XIAN J, GENG J, et al. Multiple shape memory effect of TPI/LDPE blends[J]. Polymer International, 2017, 66(10), doi:10.1002/pi. 5387. |
[10] | MA L, ZHAO J, WANG X, et al. Effects of carbon black nanoparticles on two-way reversible shape memory in crosslinked polyethylene[J]. Polymer, 2015, 56:490-497. |
[11] | HUANG W M, DING Z, WANG C C. Shape memory materials[J]. Materials Today, 2010, 13(7-8):54-61. |
[12] | LI J, XIE T. Significant impact of thermo-mechanical conditions on polymer triple-shape memory effect[J]. Macromolecules, 2011, 44(1):175-180. |
[13] | CONJUGATED T M, LANGER R. Light-induced shape-memory polymers[J]. Nature, 2005, 434:695-697. |
[14] | XIA L, WANG Y, MA Z, et al. The organic-aqueous extraction of natural Eucommia ulmoides rubber and its properties and application in car radial tires[J]. Advances in Polymer Technology, 2015, 36(3), doi:10.1002/adv. 21607. |
[15] | SARINA, ZHANG, ZHANG L. Dynamic mechanical properties of Eucommia ulmoides gum with different degree of cross-linking[J]. Polymer Bulletin, 2012, 68(7):2021-2032. |
[16] | TSUJIMOTO T, TOSHIMITSU K, UYAMA H. Maleated trans-1,4-polyisoprene from Eucommia ulmoides oliver with dynamic network structure and its shape memory property[J]. Polymer, 2014, 55(25):6488-6493. |
[17] | XIE T. Tunable polymer multi-shape memory effect[J]. Nature, 2010, 464(7286):267-270. |
[18] | 中华人民共和国国家质量监督检验检疫总局. 硫化橡胶或热塑性橡胶压入硬度试验方法第1部分——邵氏硬度计法(邵尔硬度):GB/T 531.1-2008[S]. 北京:中国标准出版社,2008. General Administration of Quality Supervision, Inspection, and Quarantine of the People's Republic of China. Vulcanized rubber or thermoplastic determination of pressed hardness-Part 1:Determination of shore hardness:GB/T 531.1-2008[S]. Beijing:China Standards Press, 2008(in Chinese). |
[19] | TSUKADA G, KATO R, TOKUDA M, et al. Intraoral temperature triggered shape-memory effect and sealing capability of a transpolyisoprene-based polymer[J]. Polymers, 2015, 7(11):2259-2275. |