Polymer self-curing

R. L. Bowen and H. Argentar, A method for determining the optimum peroxide-to-amine ratio for self-curing resins, J. Appl. Polymer Sci. 17 (1973). 

PCL (M approximately 1300-6500) with terminal hydroxyl groups was functionalized to provide telechelic PCL with terminal carboxyl groups (XPCL) 31. This polymer was blended with epoxidised natural rubber, epoxidised to either 25% or 50% (ENR25 and ENR50, respectively). The two polymers were compounded on a two-roll mill at room temperature to provide a self-curing system. The blends were heated to 180 °C under a pressure of 1000 N cm , approximately, to cure them. For comparison, samples of the original PCL 32, with hydroxyl endgroups were blended with the epoxidised rubber [171]. 

Self-cure was the second method that was used in this study. This reaction gave us some new opportunities at experimental study of the problems mentioned above. Low cure reaction rate allowed us to measure precisely all phase transformations of the monomer. Large difference in the cure rate between the catalytic and noncatalyzed reactions and small difference in the structure of network polymer formed from the same monomer (see below) allowed us to obtain interesting information on the behavior of DGET in the magnetic field during cure. 

The goal of this study was to compare the properties of network polymer formed by DGET self-cure at a temperature of the isotropic state (ZSO C) in the liquid crystalline state (169" C) without a magnetic field, ch provides anisotropy on domain level and in the presence of the magnetic field, that provides anisotropy on the macroscopic level A typical view of thermomechanical curves of the polymers obtained by TMA is presented in Figure 7. A dashed line corre onds to the thermomechanical curve without any loading (dilatometric condition). 

In contrast to conventional acrylic bone cements, which are considered to be bioinert, bioactive systems should have a desirable influence on the host tissue they should initiate the formation of new bone. Moreover, a partial degradation of the matrix polymer should guarantee a good interlocking between bone and implant. As an example. Fig. 8.2 shows the bone-implant interface, where the implant consists of a self-curing, partially degradable matrix polymer that is flUed with bioactive hydroxyapatite (HA) particles. 

The fixation of the impiant parts in the bone may be achieved by self-curing polymer resins (bone cements) such as PMMA (see above) or via direct integration of micro- or macroporous implant surfaces into the host bone. The UHMWPE used for knee and hip joints is usually highly cross-linked [17]. 

Self-curing methyl methacrylate polymer-monomer mixtures are employed for denture repair and for relining dentures that have become ill fitting. Many attempts at soft relines have been made by plasticizing methyl methacrylate polymers and attaching to the denture base. None of these has been successful and a real need... 

A Comparison of Ultraviolet-Curing and Self-Curing Polymers in Preventive, Restorative and Orthodontic Dentistry", H. L. Lee,... 

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