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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and stability research of reproducible aqueous polyurethane micelles with low de-blocking temperature
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Synthesis and stability research of reproducible aqueous polyurethane micelles with low de-blocking temperature

机译：脱胶温度低的可再生水性聚氨酯胶束的合成及稳定性研究

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摘要

Aqueous polyurethane micelles from 2,4,6-trichlorphenol blocking terminal-isocynate pre-polymer were prepared which could be de-blocked at low temperature. The prepared aqueous blocked polyurethane micelles (BPUMs) were uniform and spherical micro-particles. The particle size was decreased with increase of the DMPA content, while it was enlarged at first and then gradually decreased by increasing R-value. The stability of the micelles was affected by the R value, blocked efficiency and DMPA content. HDI-BPUMs were more stable than HDI-BPUMs at the same condition. The stability was further researched by the zeta potential combining with technique and viscosity tracking method, and the initial zeta potential be used as the stability criterion. In addition, a stabilization mechanism of the micelles was proposed. TCP-blocked TDI-BPUMs could be initially de-blocked at about 75 degrees C and TCP-blocked HDI-BPUMs was de-blocked at about 80 degrees C. The de-blocking temperature could be further reduced in the presence of catalyst, but it was scarcely affected by the change of R-value and DMPA content. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41908
机译：制备了由2,4,6-三氯苯酚封端的异氰酸酯预聚物制成的聚氨酯胶束，该胶束可以在低温下解封。制备的水性嵌段聚氨酯胶束（BPUMs）是均匀的球形微粒。颗粒尺寸随DMPA含量的增加而减小，先增大，然后随R值的增加而逐渐减小。胶束的稳定性受R值，封闭效率和DMPA含量的影响。在相同条件下，HDI-BPUM比HDI-BPUM更稳定。通过ζ电势结合技术和粘度跟踪方法对稳定性进行了进一步研究，并将初始ζ电势作为稳定性判据。另外，提出了胶束的稳定机制。 TCP阻隔的TDI-BPUM最初可以在约75摄氏度下解封，TCP阻隔的HDI-BPUM在约80摄氏度下解封。可以在存在催化剂的情况下进一步降低解封温度，但是它几乎不受R值和DMPA含量变化的影响。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41908

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