Poly-n-propyl

Figure 2. The UV Spectra of Poly(n-propyl-methyl-co iso-propyl-methylsilane) Copolymers vith Similar Molecular Weights Having the Following Compositions (1) 75/25, (2) 50/50 and (3) 25/75.

Figure 5. 67 MHz Carbon-13 NMR Spectra for Poly(n-propyl-methylsilane). (a) Proton Decoupled (b) Proton Coupled.

Fig. 4. Temperature dependence of the shear loss modulus of poly(methyl methacrylate) (1), poly(n-propyl methacrylate) (2), poly(2-hydroxyethyl methacrylate) (3), poly(5-hydroxy-3-oxapen-tyl methacrylate) (4), and poly(8-hydroxy-3,6-dioxaoctyl methacrylate) (5)...

The selectivity of the Complex Formation is a very interesting subject, y - Cyclodextrin, (y - CD) has been found to form inclusion complexes with poly (methyl vinyl ether) (PMVE), poly(ethyl vinyl ether) (PEVE), and poly(n- propyl vinyl ether) (PnPVE) of various molecular weights to give stoichiometric compounds in crystalline states. However, a- cyclodextrin (a - CD) and (3 - Cyclodextrin ((3- CD) did not form complexes with poly (alkyl vinyl ether)s of any molecular weight, y -CD did not form complexes with the low molecular weight analogs, such as diethyl ether and trimethylene glycol dimethyl ether. 

PPA PpBrS PpCIS PPeMA PPFE poly(n-propyl acrylate) poly(p-bromostyrene) poly(p-chlorostyrene) poly(n-pentyl methacrylate) polylperfluoro ethers)... 

Table I, estimates of Vp/e relative to the corresponding value for poly(di-n-butylsilylene) were obtained poly(di-n-hexylsilylene), 0.91 poly(n-propyl-inethylsilylene), 0.61 poly(n-hexylmethylsilylene), 0.59 and poly(n-dodecylmethylsilylene), 0.44. Therefore, although the absolute magnitude of Vp/e cannot be calculated accurately, the theory is fully consistent with the observation of abrupt transitions (strong coupling) for the dialkyl-substituted polysilylenes and smeared or nonexistent transitions (intermediate or weak coupling) for the atactic polysilylenes.

Figure 3 shows a plot of the fluorescence maximum for poly(n-propyl methyl silylene) in hexane vs. sin ir/2(N + 1) using a defect energy of 1650 calories/mole. Although the ag eement here seems good, the uncertainty in location of the fluorescence maximum is large as the band broadens near room temperature and may disguise a real nonlinearity. Nevertheless, this result lends credibility to the rotational isomeric state model for thermochromism in these polysilylenes. 

Figure 2. Thermal activation of chain defects in poly(n-propyl methyl silylene).

Figure 8 is the phosphorescence spectrum taken from a glassy solution of poly(n-propyl methyl silylene) in methyl cyclopentane at 89°K. This emission is similar in width to the film emission, as are the solution spectra of the other polymers. Again delayed fluorescence is evident but the sharp vibrational fine structure is lost. The solution and film spectra are not expected to be comparable since they represent conformational equilibria (at room temperature for film and the Tg of 3-methylpentane for the solutions). 

Poly(n-propyl a-chloroacrylate) Poly(ethylene-l,5-naphthalenedicarboxylate) Poly (vinyl propional)... 

Fig. 36. TVA thermogram of poly(n-propyl acrylate) at various trap temperatures (—-----) Oand —45°C (--) —75 and —100°C [113],...

Fig. 37. Production of A carbon dioxide, propene and n-propanol during degradation of poly(n-propyl acrylate) [114].

The stracture-property correlation of different copolymers with n-butyl acrylate and isobomyl acrylate units have been studied. The primary goal was to compare thermomechanical properties of block, gradient and statistical copolymers of nBA and IBA with various acrylate homopolymers (Scheme 1). The choice of nBA and IBA was dictated by very different thermal properties of the resulting homopolymers, glass transition temperature (Tg) of PnBA is -54°C while the Tg of PIBA is 94°C. Thus, their copolymerization with carefully selected ratios should result in polymers with thermal properties, i.e., Tg similar to acrylate homopolymers poly(t-butyl acrylate) (PtBA), poly(methyl acrylate) (PMA), poly(ethyl acrylate) (PEA) and poly(n-propyl acrylate) (PPA). 

PS is miscible with several polymers, viz. polyphenyleneether (PPE), polyvinylmethylether (PVME), poly-2-chlorostyrene (PCS), polymethylstyrene (PMS), polycarbonate of tetramethyl bisphenol-A (TMPC), co-polycarbonate of bisphenol-A and tetramethyl bisphenol-A, polycyclohexyl acrylate (PCHA), polyethylmethacrylate (PEMA), poly-n-propyl methacrylate (PPMA), polycyclohexyl methacrylate (PCHMA), copolymers of cyclohexyl methacrylate and methyl methacrylate, bromobenzylated- or sulfonated-PPE, etc. Other miscible blends are listed in Appendix 2. 

Abbreviations for Table 2.19 PHMA - poly-n-hexyl methacrylate, STVPh - polystyrene-co-vinylphenol, PFSt - poly(o-fluorostyrene-co-p-fluorostyrene), P(S-co-BrS) - poly(styrene-co-4-bromostyrene), N-TPI - new thermoplastic polyimide , PPrA - poly-n-propyl acrylate, PPeA - poly-n-pentyl acrylate,... 

Figure 13.28 Shear modulus (a) and damping (b) at 1 Hz as a function of temperature for poly(n-alkyl methacrylate). (---) Polymethyl methacrylate (-) polyethyl methacrylate (----) poly(n-propyl meth-...

Table 3.3 Degradation products and poly(isopro] yields of poly(n-propyl acrylate) and pyl acrylate) ...

With poly-n-propyl acrylate a greater amount of monomer was produced than with the polyisopropyl ester and as expected from the mechanism proposed, the proportion of propane was much lower with the polymeric normal ester compared with amounts of polypropylene from the polymeric isoester. 

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