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首页> 外文期刊>Journal of Applied Polymer Science >A Study of the Morphology of Polyurethane-Polystyrene Interpenetrating Polymer Networks by Means of Small Angle X-ray Scattering, Modulated-Temperature Differential Scanning Calorimetry, and Dynamic Mechanical Thermal Analysis Techniques
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A Study of the Morphology of Polyurethane-Polystyrene Interpenetrating Polymer Networks by Means of Small Angle X-ray Scattering, Modulated-Temperature Differential Scanning Calorimetry, and Dynamic Mechanical Thermal Analysis Techniques

机译：小角度X射线散射，调制温度差示扫描量热法和动态机械热分析技术研究聚氨酯-聚苯乙烯互穿聚合物网络的形貌

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摘要

The morphology of polyurethane-polystyrene (PU-PS) (60 : 40 by weight) interpenetrating polymer netWorks (IPNs), in which internetWork graftjng via 2-hydroxy- ethyl methacrylate resides (HEMA)(1, 2.5, and 10wt %, res~ively)in the polystyrene netWorks has been studied by means of small angle X-ray scattering (SAXS), modulated- temperature scanning calorimetry (M- TDSC), and dynamical mechanical thermal analysis (DMTA) techniques. With increasing internetWork grafting, the average size of domains became smaller (SAXS data) and the degree of component mOOng increased (M-TDSC and DMTA results). For the PU-PS (60 : 40 by weight) IPN with 100/0 HEMA, the DMTA tan 8-temperature plot showed a sjngle peak. This DMTA result implied that the morphology of this PU-PS IPN is homogeneous. However, the M-TDSC data showed that three PU-PS (60 : 40) IPNs samples (with 1, 2.5, and 10 wt 0/0 HEMA, respectively) were phase separated. For the three IPN samples, the correlation 1ength of the segregated phases, obtained from SAXS data based on the Debye-Bueche method, did not show distinct differences. With increasing internetWork grafting, the scattered intensity decreased. This study concluded that for these IPNs, SAXS is sensitive to the size of domains and compo- nent mixing, but no quantitative analysis was given for the component mixing. M- TDSC is suitable to be used to quantify the degree of component mixing or the weight fraction of interphases, and DMTA is sensitive to damping behavior and to phase continuity. However, DMTA cannot provide quantitative information about the degree of component mixing or the weight (or volume) fraction of the interphases.
机译：聚氨酯-聚苯乙烯（PU-PS）（60:40重量比）互穿聚合物网络（IPN）的形态，其中通过甲基丙烯酸2-羟基乙酯接枝的InternetWork接枝（HEMA）（分别为1,2.5和10wt％在聚苯乙烯网络中，已经通过小角度X射线散射（SAXS），调温扫描量热法（M-TDSC）和动态机械热分析（DMTA）技术进行了研究。随着InternetWork嫁接次数的增加，域的平均大小变小（SAXS数据），组件mOOng的程度增加（M-TDSC和DMTA结果）。对于具有100/0 HEMA的PU-PS（60:40重量比）IPN，DMTA tan八温度图显示了一个尖峰。该DMTA结果暗示该PU-PS IPN的形态是均匀的。但是，M-TDSC数据显示，将三个PU-PS（60:40）IPN样品（分别具有1、2.5和10 wt 0/0 HEMA）相分离。对于这三个IPN样本，基于Debye-Bueche方法从SAXS数据获得的分离相的相关1ength并未显示出明显的差异。随着互联网嫁接的增加，分散强度降低。这项研究得出的结论是，对于这些IPN，SAXS对域的大小和成分混合很敏感，但没有对成分混合进行定量分析。 M-TDSC适用于定量组分混合的程度或中间相的重量分数，而DMTA对阻尼行为和相连续性敏感。但是，DMTA无法提供有关组分混合程度或中间相重量（或体积）分数的定量信息。

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