非晶或结晶尼龙6共混改性热塑性聚氨酯的耐溶剂性能
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摘要
采用机械共混法分别制备了非晶尼龙6(Amorphous-PA6)/热塑性聚氨酯(TPU)与一般结晶的尼龙6(Crystalline-PA6)/TPU 2种塑料合金,分析了尼龙6的非晶与结晶结构及共混比对塑料合金的耐热、抗拉和耐溶剂性能的影响。随着A-PA6含量增大,A-PA6/TPU合金的耐热、抗拉和耐溶剂性能均逐渐提高,当A-PA6含量分别为10%和25%时,拉伸强度从纯TPU的35.0 MPa增至40.9 MPa和43.9 MPa,断裂伸长率基本不变,天那水浸泡6 h的溶胀率比纯TPU降低达到14%,拉伸强度从纯TPU的18.8 MPa提高到26.8 MPa和35.1 MPa,后者比纯TPU增高86.7%,而与纯TPU浸泡前相当。C-PA6/TPU合金的C-PA6最佳含量为10%,天那水浸泡6 h后拉伸强度从浸泡前的37.6 MPa降至23.0 MPa,其抗拉和耐溶剂性能均低于A-PA6/TPU。
The two kinds of plastic alloy of amorphous nylon 6(A-PA6)/thermoplastic polyurethane(TPU) and crystalline nylon 6(C-PA6)/TPU were prepared by mechanical blending, respectively, and effects of the amorphous and crystalline structures of nylon 6 and blending-ratios on the heat-resistant, tensile strength and solvent resistance were analyzed. With the increase of A-PA6 content, the heat resistance, tensile strength and solvent resistance of A-PA6/TPU are gradually improved. When the A-PA6 contents are 10% and 25%, the tensile strength is increased from 35.0 MPa of pure TPU to 40.9 MPa and 43.9 MPa, and the elongation at break is basically unchanged, and the swelling rate of immersion for 6 h in Tianna water is decreased by 14% than that of pure TPU, and its tensile strength is increased from 18.8 MPa of pure TPU to 26.8 MPa and 35.1 MPa, the latter is 86.7% higher than that of pure TPU and is comparable to that of the pure TPU before soaking. The optimum content of C-PA6 for C-PA6/TPU is 10%, and after soaking for 6 h in Tianna water, its tensile strength is reduced from 37.6 MPa to 23.0 MPa, but its tensile and solvent resistances are still lower than those of A-PA6/TPU.
The two kinds of plastic alloy of amorphous nylon 6(A-PA6)/thermoplastic polyurethane(TPU) and crystalline nylon 6(C-PA6)/TPU were prepared by mechanical blending, respectively, and effects of the amorphous and crystalline structures of nylon 6 and blending-ratios on the heat-resistant, tensile strength and solvent resistance were analyzed. With the increase of A-PA6 content, the heat resistance, tensile strength and solvent resistance of A-PA6/TPU are gradually improved. When the A-PA6 contents are 10% and 25%, the tensile strength is increased from 35.0 MPa of pure TPU to 40.9 MPa and 43.9 MPa, and the elongation at break is basically unchanged, and the swelling rate of immersion for 6 h in Tianna water is decreased by 14% than that of pure TPU, and its tensile strength is increased from 18.8 MPa of pure TPU to 26.8 MPa and 35.1 MPa, the latter is 86.7% higher than that of pure TPU and is comparable to that of the pure TPU before soaking. The optimum content of C-PA6 for C-PA6/TPU is 10%, and after soaking for 6 h in Tianna water, its tensile strength is reduced from 37.6 MPa to 23.0 MPa, but its tensile and solvent resistances are still lower than those of A-PA6/TPU.
引文
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[2] Seymour R W,Estes G M,Cooper S L.Infrared study of segmented polyurethane elastomers I.hydrogen bonding[J].Macromolecules,1970,3:1979.
[3] Dassin S,Dumon M,Mechin F,et al.Thermoplastic polyurethanes (TPUs) with grafted organosilane moieties:a new way of improving thermomechanical behavior[J].Polym.Eng.Sci.,2010,42:1724-1739.
[4] Seymour R W,Cooper S L.Thermal analysis of polyurethane block polymers[J].Macromolecules,1973,6:48-53.
[5] Coleman M M,Painter P C,Graf J F.Specific interactions and the miscibility of polymer blends[M].[S.l.]:Routledge,2017.
[6] Genovese A,Shanks R A.Simulation of the specific interactions between polyamide-6 and a thermoplastic polyurethane[J].Comput.Theor.Polym.Sci.,2001,11:57-62.
[7] Franke C,P?tschke P,R?tzsch M,et al.Wirkung von Diisocyanat als reaktiver Koppler in TPU/PA6-blends[J].Angew.Makromol.Chem.,1993,206:21-38.
[8] Zhang S L,Wang G B,Jiang Z H,et al.Impact properties,phase structure,compatibility,and fracture morphology of polyamide10/thermoplastic poly(ester urethane) elastomer blends[J].J.Polym.Sci.Part B:Polym.Phys.,2005,43:1177-1185.
[9] Br?uer M,Hupfer B,Nagel J,et al.Chemical modification of polyurethane for two-component injection molding[J].Polym.Eng.Sci.,2002,42:859-869.
[10] Haponiuk J T.Dynamic mechanical thermal analysis of polyamide
6/thermoplastic polyurethane blends[J].J.Therm.Anal.,1995,43:91-101.
[11] Zhang K Z,Wu B,Shao H J,et al.Thermal properties and crystallization kinetics of a new polypropylene-polyamide 6 composite[J].J.Thermoplast.Compos.Mater.,2016,29:143-158.
[12] Shao H J,Wu B,Yang J K,et al.Effect of LiCl on the miscibility and crystallization behavior of a hydrophilic PP/PP-g-MAH/PA6 blend[J].J.Polym.Res.,2015,22:1-7.
[13] Pesetskii S S,Fedorov V D,Jurkowski B,et al.Blends of thermoplastic polyurethanes and polyamide 12:structure,molecular interactions,relaxation,and mechanical properties[J].J.Appl.Polym.Sci.,2015,74:1054-1070.