羧基型配位复合弹性体制备及性能

Preparation and Properties of Carboxyl Type Coordination Composite Elastomer

以Mg^(2+)配位交联聚丙烯酸(PAA)为配位交联组分,以丙烯酸羟乙酯(HEA)、甲基丙烯酸羟乙酯(HEMA)、甲基丙烯酸(MAA)共聚物为共价交联组分,尿素为催化剂,配位交联组分与共价交联组分原位复合制备了含羧基的配位交联复合弹性体。随着Mg^(2+)与PAA中羧基的物质的量之比由0.2∶1增加到0.4∶1,复合弹性体的拉伸强度增大。复合弹性体经过拉伸、机械疲劳、自恢复性等机械性能测试,Mg^(2+)与PAA中羧基最优物质的量之比为0.4∶1时,复合弹性体在拉伸应变为558%,拉伸强度达3.07 MPa;压缩应变为78%,压缩强度达6.9 MPa;其应变能为1.35 MJ/m^(3),100%模量为2.21 MPa;此复合弹性体连续弯曲800次后,破裂强度为1.9 MPa;此复合弹性体在拉伸应变为20%时,单次拉伸和500次拉伸循环后,自恢复性最优;在压缩应变为38%时,单次压缩和连续压缩150次后,自恢复性最优。此复合弹性体在压缩应变为38%时,单次压缩和连续压缩150次后,自恢复性最优。展现了高强度、高韧性、优异的耐疲劳性和自恢复性,在增韧弹性体、抗疲劳弹性体等方面具有应用潜力。

Metal ion coordination elastomers have developed toughened elastomers and fatigue-resistant elastomers due to their excellent mechanical properties including tensile stress,compression stress,and fatigue resistance.Mg^(2+)coordination cross-linked polyacrylic acid(PAA)is used as the coordination cross-linking component,and hydroxyethyl acrylate(HEA),hydroxyethyl methacrylate(HEMA),and methacrylic acid(MAA)copolymers are used as the covalent cross-linking component,urea is served as the catalyst,the coordination component and the covalent cross-linking component are in situ complexed to prepare a carboxyl-containing coordination cross-linked composite elastomer.With the increase of the molar ratio of Mg^(2+)to carboxyl groups in PAA increases from 0.2∶1 to 0.4∶1,the tensile strength of the composite elastomer increases.After tensile,mechanical fatigue,self-healing and other tests,when the optimal molar ratio of carboxyl Mg^(2+)to carboxyl groups in PAA is 0.4∶1,this elastic has a tensile strength of 3.07 MPa at tensile strain of 558%,and the compressive strength is 6.9 MPa at compressive strain of 78%,the strain energy is 1.35 MJ/m^(3),100%modulus is 2.21 MPa;after 800 consecutive bendings,the breaking strength is 1.9 MPa.The elas-tomer exhibit excellent self-recovery at the tensile strain of 20%after a single tensile and 500 tensile cycles.The elastomer display excellent self-recovery after a single compression and 150 consecutive compressions at the compression strain of 38%.The elastomer demonstrates high strength,high toughness,excellent fatigue resistance and self-healing properties,and is potentially used in tough-ened elastomers,fatigue-resistant elastomers,etc.