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Evaluation of Polymethylmethacrylate Cohesion Behavior with a Gas‐Assisted Thermal Bonding Method
Author(s) -
Sun PeiKang,
Besser Ronald S.
Publication year - 2020
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.25269
Subject(s) - materials science , composite material , thermoplastic , glass transition , cohesion (chemistry) , differential scanning calorimetry , fabrication , bonding strength , thermal , polymer , thermodynamics , chemistry , physics , organic chemistry , medicine , alternative medicine , pathology
By applying heat and pressure to thermoplastic materials, the overlap of the two pieces can be bonded to form hermetic systems. Polymethylmethacrylate (PMMA) is a thermoplastic used in commercial microfluidic devices; its advantages include low cost, ready fabrication, and high transparency. In order to gain an understanding of PMMA's relevant characteristics (thermal behavior, material strength, and hermetic sealing strength), we study its bulk properties and mechanical behavior. Experimental results of the cohesion behavior of PMMA sheets were collected and are presented here. Samples were bonded by subjecting a sample to elevated pressure and temperature in the glass transition range (85°C–165°C), which was determined beforehand by differential scanning calorimetry and literature. Five different bonding temperatures (140°C, 150°C, 160°C, 170°C, and 180°C) and three bonding pressures (1.2, 1.4, and 1.6 MPa) were applied for making samples; mechanical strength tests were then carried out to understand separately the bulk mechanical strength and the interfacial properties (shear strength and bonding strength) of a cohesive laminate at the temperatures near the glass transition range. POLYM. ENG. SCI., 60:161–167, 2020. © 2019 Society of Plastics Engineers