Dynamic mechanical analysis of storage modulus development in light-activated polymer matrix composites.
Dynamic mechanical analysis of storage modulus development in light-activated polymer matrix composites.
复制标题
光激活聚合物基复合材料中储能模量发展的动态力学分析。
DOI：
10.1016/s0109-5641(01)00082-3
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Borgersen,SvennE
中科院分区：
文献类型：
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作者：
Sakaguchi,RonaldL;Shah,NilamC;Lim,BumSoon;Ferracane,JackL;Borgersen,SvennE
ObjectivesThe本研究的目的是评估使用动态力学分析的管状几何形状在一个三点弯曲夹具监测的储能模量发展的光活化聚合物matrix composite.MethodsComposite样品插入到PTFE管和测试中的三点弯曲夹具中的动态力学分析仪（DMA）在200 Hz，20μm的振幅。将样品光活化60 s（复合材料表面385 mW/cm 2），并连续测量所研究的七种光活化复合材料（一种微填充、四种杂化和两种未填充树脂）的储能模量（E′）。13.5分钟后从PTFE鞘管中取出复合材料芯，并在DMA中使用相同参数进行评价。创建测试配置的有限元模型，并用于估计DMA的操作参数。转换度（DC）使用微傅立叶变换红外（FTIR）光谱测量的微填充复合材料样品和一个混合13.5和60分钟后，光activation.ResultsThe E′为一个通用的混合和微填充复合材料分别为13，400 ±1100和5900± 200 MPa，当固化管内，然后删除，并在DMA测试。混合物的DC为54.6%，微填充物的DC为60.6%。皮和芯与单独芯的E '的线性回归（r2=0.986）表明，皮和芯的E'值的线性缩放使得能够校正复合芯的估计E '值。虽然这种方法是唯象的，因为E′的定量测量不是直接从DMA中进行的，但早期聚合动力学的估计似乎可以通过三种不同的方法来验证。
ObjectivesThe goal of this study was to evaluate the potential for using dynamic mechanical analysis of tubular geometry in a three-point flexure fixture for monitoring the storage modulus development of a light-activated polymer matrix composite.MethodsComposite samples were inserted into PTFE tubes and tested in a three-point bend fixture in a dynamic mechanical analyzer (DMA) at 200Hz with 20μm amplitude. Samples were light activated for 60s (385mW/cm2at the composite surface) and storage modulus (E′) was measured continuously for the seven light-activated composites studied (one microfill, four hybrids and two unfilled resins). Cores of composite were removed from the PTFE sheath after 13.5min and evaluated with the same parameters in the DMA. A finite element model of the test configuration was created and used to estimate operating parameters for the DMA. Degree of conversion (DC) was measured using micro-Fourier Transform Infrared (FTIR) spectroscopy for the microfilled composite samples and one hybrid 13.5 and 60min after light activation.ResultsThe E′ for a generic hybrid and microfilled composite was 13,400±1100 and 5900±200MPa, respectively, when cured within the tube and then removed and tested in the DMA. DC was 54.6% for the hybrid and 60.6% for the microfill. A linear regression of E′ for the sheath and core vs core alone (r2=0.986) indicated a linear scaling of the sheath and core values for E′ enabling a correction for estimated E′ values of the composite core.SignificanceThis method estimates the storage modulus growth during light-activated polymerization of highly filled dimethacrylates. Although the approach is phenomenological in that quantitative measurements of E′ are not made directly from the DMA, estimates of early polymerization kinetics appear to be validated by three different approaches.