Mass matrix classical mechanics

The toluene-soluble fraction consists of a major product that has been identified as a CgQ-TEA monocycloadduct 7V-ethyl-rra/w-2, 5 -dimethyl-pyrrol-idino[3, 4 l,2][60]fullerene (14) by use of matrix-assisted laser desorption ionization mass spectroscopy and NMR methods [71]. It is interesting that the photochemical reaction actually results in the formation of a cycloadduct. This is unique to the fuilerene system because there have been no reports of cycloadducts in reactions involving nonfullerene acceptors [119-122], such as rra/is-stilbene. In the context of the classical photoinduced electron transfer-proton transfer mechanism [124], a two-step process for the formation of the cycloadduct has been proposed [71]. 

Polypropylene (PP), for example, burns very easily and dripping is observed during its combustion. The use of virgin PP is thus limited when flammability properties are required. Several approaches have been developed to increase its fire-retardant properties. Hornsby [1] reviewed the approach of using classical fillers in PP to increase its fire-retardancy behaviour. With classical fillers, the main problem is the loading (typically between 40% and 60% of total mass), which directly affects the mechanical properties of the polymer. Another problem is that the filler must be treated to increase its interfacial adhesion with the matrix. 

Both Sn(Oct)2 and Al(Oi-Pr)3 have been extensively studied in terms of activity, polymerization control and mechanism [8, 9]. According to experimental and theoretical data, the polymerization proceeds via a three-step coordination-insertion mechanism (Scheme 10.2). With Sn(Oct)2, the key alkoxide complex is generated in situ upon reaction with the exogenous alcohol. The nature of the ester chain-end is intimately related to the initiating alkoxide, and it is classically determined experimentally by H NMR and/or mass spectrometry, using electrospray ionization (ESI) or matrix-assisted laser desorption ionization time-of-flight (MALDl-ToF) techniques. When all of the monomer has been consumed, the active metal-alkoxide bond is hydrolyzed and a hydroxyl end-group is Uberated. 

---