CHEMBIO 3BM3 Lecture Notes - Lecture 17: Molar Mass Distribution, Gel Permeation Chromatography, Differential Scanning Calorimetry
21 Apr 2019
School
Department
Course
Professor
Document Summary
Polymer stereoregularity and monomer optical purity: if the monomer is optically active. Polydispersity index, number average molecular weight, weight average molecular weight need 2 out of 3: polydispersity: measure of the distribution of molecular mass. Whether polymer is linear, crosslinked or branched. Chemical structure: chemical chain configuration (branching, additives analysis, surface composition, residual monomer, residual catalysts and initiators, molecular weight distribution. Ftir (fourier-transform infrared spectroscopy: polymer identification, lubricants. Gpc (gel permeation chromatography: mw distribution, monomers, oligomers. Quantitative additive analysis: dissolution/precipitation, hplc and gpc, additives. Differential scanning calorimetry: crystallinity, tm and tg. Position of reinforcement within the matrix: location within the part, 3d orientation, fiber density, distance between reinforcement components or reinforcement:matrix volume and weight ratios, fiber contacts and cross-overs per mm. Reinforcement structure: particulate, cross-sectional shape, surface texture and treatment, dimensions, fiber twist, denier, weave. Voids: mean volume percent, interconnections, penetration depth and profile.
