Molecular weight and thermal properties

Table 5.2. Molecular Weights and Thermal Properties of Fluorinated Hybrid Homopolymers... 

C2F4—VDF—HFP. Table 5.2 gives the molecular weights and thermal properties of the fluorosilicones we obtained. The influence of the key group in terms of these properties is as follows ... 

Table 1. Synthetic, molecular weight and thermal properties of LLA/43K and LLA/80K PCL copolyesters. 

Grosshardt et al. prepared a series of furan based polyesters, by reacting FDCA dimethyl ester with 1,3-propanediol, 1,6-hexanediol, 1,12-dodecanediol and 1,18-octadecanediol, using calcium acetate and antimony(III) oxide as catalysts [47]. Molecular weights and thermal properties were determined for all polyesters and are summarized in Table 9.6. 

Table 15.1 GPC molecular weights and thermal properties of the cured alternating (7A3.J, 7Aj.

Table I lists molecular weights and thermal properties for PpMS Table II gives hot stage microscope data for the other PS derivatives. Molecular weights for the PSs depicted in Figs. 2,3, and 4 are found in Table I of ref. 3.

Some representative backbone stmctures of PQs and PPQs and their T data are given in Table 1. As in other amorphous polymers, the Ts of PQs and PPQs are controlled essentially by the chemical stmcture, molecular weight, and thermal history. Several synthetic routes have been investigated to increase the T and also to improve the processibiUty of PPQ (71). Some properties of PPQ based on 2,3-di(3,4-diaminophenyl)quinoxaline and those of l,l-dichloro-2,2-bis(3,4-diaminophenyl)ethylene are summarized in Table 2. 

To understand the properties that make polyanhy-drides suitable drug carriers, their chemical, physical, and thermal behavior need to be characterized. This section discusses the methods to determine the chemical structure and composition, the molecular weight, the thermal properties, the phase behavior, the stability, and the erosion mechanism of polyanhydrides. 

Other properties such as calorific value, carbon residue, specific heat, softening point, flash point, molecular weight, and thermal conductivity are also used to determine the suitability of the bitumen for conversion options. 

In this study siloxane-urethane copolymers were prepared by the reaction of a,(o-hydroxyhexyl terminated PDMS oligomers, 4,4 -isocyanatocyclohexylmethane and 1,4-butanediol, which was used as the chain extender. Influence of the reaction solvent, PDMS molecular weight and hard segment content on the overall molecular weight and thermal and mechanical properties of the products were investigated. Performance of PDMS based polyurethanes were compared with those of PTMO based systems, with similar structures and compositions. 

DSC, TG, and DTA can be used in correlation with the oxidative induction time (OIT) changes in molecular weight and tensile properties to establish both thermal stability and stabilizer efficiency— Figure 2. 

Richardson MJ, SaviU NG (1977) Volumetric properties of polystyrene influence of temperature, molecular weight and thermal treatment. Polymer 18 3-9... 

Jordens K, Wilkes GL, Janzen J, Rohlfing DC, Welch MB The influence of molecular weight and thermal history on the thermal, rheological, and mechanical properties of metallocene-catalyzed linear polyethylenes. Polymer 41(19) 7175-7192, 2000. 

In Table 1 some of the properties of raw synthetic hj -l,4-polyisoprene (Goodyear s Natsyn) and natural mbber (Hevea) are presented along with references that contain additional thermal, optical, electrical, and mechanical property data. Some properties of synthetic /n j -l,4-polyisoprene (Kuraray TP-301) are also given. Molecular weights and mol wt distribution are determined by gel-permeation chromatography (gpc) (11). 

Table 10.2 Effect of molecular weight and density (branching) on some mechanical and thermal properties of polyethylene...

---