Polypropylene Case Study

1211 Words5 Pages

Table 4. This is the main polymer family most widely used as the raw material (cont.)

Polyamide

Held by amide links (repeating units of amide) - wears resistance
- good fatigue strength
- good sliding properties Nylon
- clothing
- carpets
Kevlar
- bulletproof vest
- boat construction

Polyethylene
Resin made from the polymerization of ethylene - antioxidant
- good toughness
- high density - packaging
- piping
- containers
- bags

Mayer (1993) suggested a design solutions to minimize mass or cost of fiber uses. In his design, he stated that for every complex loading to be made, the designer need to work closely to the fabricator and material supplier. He used the terms of “Mass versus Cost” since he considered the engineer or the designer always have particular matter to do with the budget or …show more content…

Polymerization of propylene through the catalyst. The common and usual catalyst used is Ziegler-Natta catalyst which it is a transition metal catalyst in the polypropylene and titanium industry (Malpass & Band, 2012).

Figure 2: The reaction of propylene in assist of catalyst (Malpass and Band, 2012) Again, according to Malpass and Band (2012), the polypropylene is preparedly in such uncertain range composition because different in the microstructure, monomers and have a series of molecular weight. It is determined by the selective catalyst, the adequate conditions in polymerization and optional process. Further view by van der Ven (1990) of how polymerization of propylene through Ziegler-Natta catalyzed. The reaction is consist of three steps:
i. Active centre formation –
Usually, a chloride which is in the surface of titanium is alkylated by the co-catalyst which then triggered a titanium carbon (active center). There is a few aluminum species which is in complex series involve in the process in the present of electron donor. Figure 3: Reaction by active center formation (Malpass and Band,

Open Document