Abstract
Poly (butyl methacrylate) (PBMA) was blended with a series of phenolic resins (PR) to study the effect of PR molecular weight on dynamic mechanical properties of PBMA/PR composites. Differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) found a similar variation of glass transition temperature (Tg). The maximum loss peak (tanδmax) improved in all PBMA/PR blends compared with the pure PBMA. However, tanδmax reduced as the molecular weight increased. This is because PR with higher molecular weight is more rigid in the glass transition zone of blends. The hydrogen bonding between PBMA and PR was characterized by Fourier transform infrared spectroscopy (FTIR). Lower molecular weight PR formed more hydrogen bonds with the matrix and it had weaker temperature dependence. Combined with the results from DMA, we studied how molecular weight affected hydrogen bonding and thus further affected tanδmax.
Highlights
In order to reduce the harm caused by vibration in people’s daily life and industrial production, the development of damping materials is becoming more and more important [1]
Tanδmax is influenced by molecular motions on different length scales and it is difficult to improve on the high temperature side
For the sake of discussion, phenolic resins (PR) is recorded as A01, A02, A03, A04, and A05 according to their molecular weights from small to large
Summary
In order to reduce the harm caused by vibration in people’s daily life and industrial production, the development of damping materials is becoming more and more important [1]. Tanδmax is influenced by molecular motions on different length scales and it is difficult to improve on the high temperature side. Wu [13] found that hydrogen bonding between polymer and small molecule substance can effectively improve tanδmax. This provides a new idea for the preparation of high performance damping materials. Some reports about the effect of hydrogen bonding on the damping properties of polymer/small molecule hybrids have been reported [14,15]. Some scholars [16,17] have prepared composites with high damping properties by blending polymer with inorganic materials grafted with hindered phenol. We put forward explanation to interpret the phenomenon observed in our case
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