EP-PI 及BMI-PES 的反应诱导相分离
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中国科学院化学研究所

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TQ343

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Reaction ̄Induced Phase Separation of the Epoxy/ Polyimide andBismaleimide/ Polyethersulfone Blends
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    摘要:

    研究了EP / PI 和BMI/ PES 两种TS/ TP 共混体系的反应诱导相分离过程及形貌结构ꎮ 采用相差
    显微镜原位研究了反应诱导相分离的过程ꎬ发现分相初期形成了均匀的相结构ꎻ随着相分离的发展ꎬ一定浓度
    区域样品中的双连续结构经过演化发展ꎬ分相后期样品内部与边缘的形貌不一致ꎮ 通过对固化后样品断面的
    SEM 观察ꎬ发现在TP 浓度很低时形成海岛结构ꎬ当TP 浓度稍高ꎬ样品形成了核壳结构ꎬ在样品边缘和与基板
    接触的上下等外侧形成了TS 的富集区ꎬ只有极少量的TP 分散颗粒存在ꎻ在样品的中间ꎬTS 和TP 形成双连续
    结构ꎬ其中TP 富集相具有细丝状的网络特征ꎮ 分析认为ꎬEP 和BMI 为热固性树脂ꎬ初始样品为小分子ꎬ在反
    应开始时表现为流体ꎬ为快组分ꎻPI 和PES 为典型的热塑性聚合物ꎬ它们的黏弹性特征随着相分离的发展越来
    越显著ꎬ即Tg以下为玻璃态ꎬTg以上表现出弹性、黏弹性特征ꎬ为慢组分ꎮ 在反应分相过程中ꎬ由于TP 富集相
    缠结网络的松弛慢于相分离的速度ꎬ因此TP 富集相网络的整体收缩不可避免ꎬ在TP 与TS 动力学极不对称的
    作用之下ꎬ初始均匀的双连续结构最终发展为核壳结构ꎮ

    Abstract:

    Two types of thermoset ( TS) / thermoplastic ( TP) blends were studied in this workꎬ including the
    EP / PI and BMI/ PES systems. In ̄situ reaction ̄induced phase separation was studied by the phase contrast micro ̄
    scope. In the initially homogeneous sampleꎬ uniform phase separate morphology was formed in all the samples. At cer ̄
    tain concentrationsꎬ the initial bicontinuous structure gradually changed to be ununiform inside and outside the sam ̄
    ples. Scanning electron microscope was used to observe the fractured cross sectional surfaceꎬ after the samples were i ̄
    sothermally cured. At very low TP concentrationsꎬ sea ̄island structure is formedꎬ with the TP ̄rich particles dispersed
    in the TS ̄rich matrix. At relative higher TP concentrationsꎬ a macroscopic core ̄shell structure is formed in the whole
    sample. The outer areaꎬ including edge of the sample and upper and lower part close to the substratesꎬ mostly consis ̄
    ted of TS ̄rich domainsꎬ with only few of TP ̄rich particles randomly located. In the inner partꎬ bicontinuous structure
    formedꎬ where the TP ̄rich phase is thin and extending like a network. The current two systems have some points in
    common: TS monomer and oligomers are good fluid at the experimental temperaturesꎬ as are the fast componentꎻ the
    TP polymers are macromolecules and have high glass transition temperaturesꎬ as are slow component with viscoelastic
    featuresꎻ with the phase separation proceedingꎬ viscoelasticity of the TP gradually showedꎬ being glassy below Tg and
    elastic or viscoelastic under Tg. The entangled TP ̄rich network need much time to relaxꎬ which cannot follow the
    speed of phase separation. Thusꎬ the whole entangled TP ̄rich network would inevitably shrink to promote the phaseseparation. With the strong dynamic asymmetry in such systemsꎬ the initially formed bicontinuous developed to be the
    macroscopic core ̄shell structure in the whole sample.

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陈凤华1 郭 颖1 孙同臣2 周 恒1 赵 彤.EP-PI 及BMI-PES 的反应诱导相分离[J].宇航材料工艺,2016,46(3).

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  • 在线发布日期: 2016-11-28
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