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Tailoring the hard domain cohesiveness in polyurethanes by interplay between the functionality and the content of chain extender

机译：通过相互作用和链扩展器的内容之间的相互作用来定制聚氨酯中的硬域凝聚力

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摘要

Crosslinked polyurethane-ureas based on a mixture of 4,4'-dibenzyl diisocyanate, poly(ethylene adipate) glycol, diethylene glycol (DEG) and trimethylol propane (TMP) were synthesized with various ratios of DEG and TMP. The combination within the network structure of the chemical crosslinks generated by TMP and the cohesive strength of urethane and urea groups, which provide physical crosslinking points, plays a special role in the mechanical and thermal properties. Fourier transform infrared (FTIR) spectroscopy indicated the distribution of hydrogen bonds in these networks. The extent of crosslinking was monitored through dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC) and atomic force microscopy (AFM) and was found to be significantly influenced by the double function of TMP: plasticizer and crosslinker. The width and intensity of the glass transition region and the evolution of the storage modulus on the rubbery plateau region were analyzed in order to observe the trends in crosslinking and network homogeneity. The improved mechanical properties were generally accredited to the effect of crosslinking resulting from the high hydrogen bonding capability of the urea group in conjunction with the good rubber elasticity of the network.
机译：基于4,4'-二苄基二异氰酸酯，聚（乙烯己二酸酯）二醇，二甘醇（DEG）和三羟甲基丙烷（TMP）的交联聚氨酯脲由各种含量和TMP的比例合成。通过TMP产生的化学交联的网络结构内的组合和提供物理交联点的氨基甲酸酯和脲基团的内聚强度，在机械和热性质中起着特殊作用。傅里叶变换红外（FTIR）光谱表明这些网络中的氢键分布。通过动态力学分析（DMA），差示扫描量热法（DSC）和原子力显微镜（AFM）监测交联程度，发现受TMP的双重功能的显着影响：增塑剂和交联剂。分析了玻璃过渡区域的宽度和强度和橡胶高原区域上的储存模量的演化，以观察交联和网络均匀性的趋势。通常对尿素组的高氢键能力结合网络的良好橡胶弹性产生的交联产生的改善的机械性能。

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  • 来源
    《RSC Advances》 |2015年第94期|共10页
  • 作者

    Ionita Daniela; Gaina Constantin; Cristea Mariana; Banabic Dorel;

  • 作者单位

    Petru Poni Inst Macromol Chem Iasi 700487 Romania;

    Petru Poni Inst Macromol Chem Iasi 700487 Romania;

    Petru Poni Inst Macromol Chem Iasi 700487 Romania;

    Tech Univ Cluj Napoca Cluj Napoca 400114 Romania;

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  • 正文语种 eng
  • 中图分类 化学;
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