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首页> 外文期刊>Journal of Applied Polymer Science >Morphological investigation of thermosets toughened with novel thermoplastics. I. Bismaleimide modified with hyperbranched polyester
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Morphological investigation of thermosets toughened with novel thermoplastics. I. Bismaleimide modified with hyperbranched polyester

机译：用新型热塑性塑料增韧的热固性塑料的形态研究。 I.用高支化聚酯改性的双马来酰亚胺

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The morphology of a bismaleimide (BMI) toughened with a thermoplastic hyperbranched aliphatic polyester (HBP) was studied by scanning electron microscopy (SEM). The effect of thermoplastic architecture, molecular weight, and end group on the size and arrangement of the dispersed phase was investigated and compared with the thermoset fracture toughness. SEM micrographs showed that higher molecular weight HBP formed roughly spherical dispersed domains of up to approx. 60 µm, which contained BMI inclusions. Lower molecular weight HBP formed spherical dispersed thermoplastic domains, with diameters up to approx. 10 µm with no BMI inclusions. A low molecular weight linear polyester with a repeat unit structure, which was similar to that of the HBP, was prepared and used as a control. Within error, BMI toughened with the linear control yielded the same fracture toughness as the best values obtained with HBP-modified BMI, but the morphology differed. The linear polyester phase separated into particles with a larger average diameter and also possessed some phase-inverted regions. End group effects were studied by modifying the hydroxy-terminated HBP to unreactive nitrophenyl, phenyl, and acetyl end groups. The nitrophenyl-terminated HBP did not phase separate from the thermoset, whereas the nonpolar phenyl- and acetyl-terminated HBP phase separated to form small ( less than or equal 1 µm and approx. 2 µm, respectively) spherical domains. Some comparisons were made to other results with HBP thermoplastics in BMI and epoxy thermosets.
机译：通过扫描电子显微镜（SEM）研究了用热塑性超支化脂族聚酯（HBP）增韧的双马来酰亚胺（BMI）的形态。研究了热塑性结构，分子量和端基对分散相尺寸和排列的影响，并与热固性断裂韧性进行了比较。扫描电镜显微照片显示，较高分子量的HBP形成了大致球形的分散结构域，其分散度最高约为。 60 µm，其中包含BMI夹杂物。较低分子量的HBP形成了球形分散的热塑性区域，直径最高可达约。 10 µm，无BMI夹杂物。制备具有类似于HBP的重复单元结构的低分子量线性聚酯，并将其用作对照。在误差范围内，通过线性控制增韧的BMI产生的断裂韧度与HBP改性的BMI获得的最佳值相同，但形态有所不同。线性聚酯相分离成具有较大平均直径的颗粒，并且还具有一些相转化的区域。通过将羟基封端的HBP修饰为未反应的硝基苯基，苯基和乙酰基端基，研究了端基的影响。硝基苯基末端的HBP不会与热固性材料发生相分离，而非极性苯基末端和乙酰基的HBP相会分离形成小的（分别小于或等于1 µm和大约2 µm）球形区域。与BMI和环氧热固性材料中HBP热塑性塑料的其他结果进行了一些比较。

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