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Posted: September 14th, 2022
PKG 825-FS22 Polymer Packaging Materials Homework I
PKG 825-FS22 Polymer Packaging Materials Homework I
Homework I: to finish HW I, you will want to learn chapters 1 to three, the lab, and the lecture materials. You will need to present a whole reply to every Question Assignment to obtain all of the factors. The HW I report have to be typed and submitted to the task folder. Complete factors: 100 pts.
Due date: Firday, 9/16/22 at 11:55 PM EDT.
Questions
1. The determine under reveals the glass transition and melting temperatures of the principle packaging polymers (i.e., PEs, PET, PS, Nylon, PVDC) and a few biodegradable polymers (i.e., PLA, PCL, PHB/V, PHA). Primarily based on the knowledge acquired within the class, clarify the principle purpose for this distinction based mostly on the polymer constitutional models. Be sure to debate the affect of every kind of chemical bond within the construction. 20 pts
Determine 1. Melting vs glass transition temperature for various polymers.
2. LLDPE is taken into account an everyday branched polymer, LDPE is taken into account a branched polymer, and HDPE is taken into account a linear polymer. Clarify how the linearity and branching of the totally different PEs are obtained and the principle results on their properties and remaining efficiency. Present concrete variations and the impact of those variations on the polymer remaining properties. 20 pts.
2. Focus on the properties (Tg, Tm, crystallinity, tensile power, barrier, water sensitivity) you’d anticipate from the polymer proven under, based mostly on issues of regularity, conformational flexibility, and intermolecular forces. Clarify your reasoning.
Comparability with better-known polymers is an effective technique to proceed. I do NOT need you to analysis this polymer (and it might properly not exist, anyway). I need, as an alternative, so that you can draw some logical conclusions based mostly on the ideas we have now mentioned in school. 20 pts
three. After studying the report Breaking the Plastic Wave, PEW Charitable Trusts, (https://www.systemiq.earth/wp-content/uploads/2020/07/BreakingThePlasticWave_MainReport.pdf), clarify what are the principle proposed waste administration methods to scale back the quantity of plastic leaking into the ocean? 20 pts .
5. Within the final decade, we acquired vital data in regards to the semicrystalline construction of polymers. What are the principle penalties of non-crystalline (i.e., cell (MAF) and the inflexible (RAF) amorphous fractions) and crystalline phases (Xc-crystalline fraction) on the properties of glassy polymers (ensure that to debate mechanical and barrier properties)? Moreover, what are the variations between a glassy and rubbery polymer? What are the implications for packaging purposes? 20 pts
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