Fragmented plastic scheme

As small molecule fragments resulting from the initiator may plasticize the polymer and lower performance, approaches have been developed to avoid this. A dihydroxyamine can be used to form a polyester [52]. This accelerator gave a modest increase in the strength of unsaturated polyester resins. A polymerizable tertiary amine has been prepared by the reaction of A-methylaniline with glycidyl methacrylate [53] (Scheme 8). 

Let us construct now a molecule that is made from the minimal number of H2C fragments. As shown in Scheme 3.7b, since H2C is a double connector, the minimal molecule will be constructed from two such fragments. Click and we make a C=C bond in the molecule H2C=CH2. This molecule is called ethylene, and like methane, it is also a gaseous material. From ethylene, we make thepoZymer polyethylene (those plastic bags that are so convenient to have but that pollute the earth). Ethylene is also a member of a family of molecules that possess C=C bonds, which are called by the common name alkene. 

We have no simple means of predicting the spherical shape of the C q molecule. However, when one huilds a model of the molecule from plastic molecular models, one witnesses that when the C20 and C21 molecular motifs in Schemes 4.1 le and 4.Ilf are constructed, they begin to curve and assume the shape of a bowl. Once we add more carhon fragments, the curvature increases, and the structure closes eventually into a sphere. I highly recommend model building as part of this lecture or in a tutoring session. 

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