User:Alex Lutz/Notebook/Experimental Chemistry - 481/2018/10/31

Experimental Chemistry - 481

Main project page Previous entry

Objective To analyze particles using DSC (differential scanning calorimetry), hydration test, and image analysis to determine size of particles. Description PVA/clay composite beads were generated with same set up as previous time DSC samples were prepared by first weighting Tzero pans and then weighing out approximately 3-5 mg of sample that was to be analyzed. Hydration test was done by adding approximately 100 mg of PVA/clay beads and PVA beads to a large falcon tube and then filling them with 50 g of distilled water. The mass of the beads would then be measured after a week had passed to see how much water they had adsorbed. Data DSC Analysis PVA/clay beads RL: Tzero pan mass 40.76 mg, sample mass 3.42 mg JN: Tzero pan mass 40.79 mg, sample mass 4.52 mg AJRL Tzero pan mass 40.92 mg, sample mass 3.22 mg JB Tzero pan mass 40.62 mg, sample mass 3.44 mg RG Tzero pan mass 40.47 mg, sample mass 3.02 mg PVA (Sigma Aldrich), lot#MKBJ6397V, Mw 31,000-50,000, 98-99% hydrolyzed RL:pan mass 40.74 mg, sample mass 4.50 mg JN: pan mass 40.48 mg, sample mass 4.38 mg AJRL: pan mass 40.57 mg, sample mass 5.41 mg JB: pan mass 40.24 mg, sample mass 3.21 mg RG: pan mass 40.59 mg, sample mass 4.74 mg DSC Procedure equil 20 degrees C isothermal for 1 minute ramp 10 degrees C/minute to 250 degrees C isothermal for 1 minute ramp 10 degrees C/minute to 20 degrees C repeat segment 2 for 1 times Hydration Test PVA/clay beads sample 1: 0.12511 g beads, 52.2327 g water sample 2: 0.126141 g beads, 50.1840 g water PVA beads sample 1: 0.12639 g beads, 50.0187 g water sample 2: 0.12515 g beads, 50.0760 g water Taken from Rachel Gill's Notebook of same day Notes DSC is done to measure transitions, 1st melting crystalline to liquid, 2nd glass transition amorphous stuck in place to amorphous to wiggling.