Poly , high molecular weight, differential

Figure 6. High molecular weight polyisobutylene in cis-poly butadiene. Differential swelling in styrene at —25°C. Blends cured 30 minutes at 300° F.

Figure 9 Effect of high molecular weight poly(MA-CDA)s (Mw 20,000) on the superoxide release in the DMSO-differentiated HL-60 cells the data are the mean of three experimental results closed bar, control open bar, unmodified MA-CDA-20K hatched bar, MA-CDA-20K-A shaded bar, MA-CDA-20K-H.

The high melt viscosity of Larc-TPI at 350°C (10 Pas) prohibits its use as an adhesive for bonding metallic or laminate skins on core honeycombs to make high strength sandwich structures. The work of Chow et al. discussed in Section 4.3.2.2 demonstrates that the melt viscosity of the poly(isoimide) form 21 of Fare TPI is of the order of 10 Pas at 240-250°C, compared to 2 x 10 Pas for polyimide 22 [25]. A semi-crystalline form of Larc-TPI has been obtained by chemical imidisation of the polyamic acid with acetic anhydride and triethylamine [63]. The differential scanning calorimetric curve exhibits an endotherm at 274°C due to melting of the crystalline sites. The value of the initial inherent viscosity (0.22 dl g ) indicates, however, that the lower melt viscosity also results from lower molecular weight polymer. 

Poly(NIPAM-co-vinyl laurate) (poly(NIPAM-co-VL)) co-polymers were prepared at various feed ratios via conventional radical random co-polymerisation. The formation, composition ratios and molecular weight of co-polymers were examined. The thermoresponsive behaviour of poly(NIPAM) and poly(NIPAM-co-VL) solutions at low and high concentrations were intensively investigated by turbidity measurement, micro-differential scanning calorimetry (Micro-DSC), temperature-variable state fluorescence, IH NMR and DLS [62]. 

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