Bulk Hyperbranch Incorporation

Two typical HB products were used. These products (IB-100 and AD-102) possess different MWs, degrees of functionality and viscosities (Table 15.1). 

Structural epoxy adhesives based on DGEBA (diglycidyl ether of bisphenol A) were cured with poly(amido-amine) and HB products at room temperature for seven days. 

The polyols and isocyanates used in the course of the investigation are fisted in Table 15.2. The methodology used was based on partial replacement of triol (BaycoU BT-1380) with the hyperbranched component in the range 0.5-5 wt.%. The formulations were characterized using bulk and adhesion specimens. 

The shear adhesion strength of the PU formulations was tested by single lap shear joints, according to ASTM D 1002-94 (at a rate of 1.3mmmin ). Peel strength was evaluated by T-Peel (ASTM 1876-95) (at a rate of 254 mm min ). 

Baycoll BT-1380 Bayer (Germany) 50 Branched polypropylene ether triol 

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The incorporation of siloles in polymers is of interest and importance in chemistry and functionalities. Some optoelectronic properties, impossible to obtain in silole small molecules, may be realized with silole-containing polymers (SCPs). The first synthesis of SCPs was reported in 1992.21 Since then, different types of SCPs, such as main chain type 7r-conjugated SCPs catenated through the aromatic carbon of a silole, main chain type cr-conjugated SCPs catenated through the silicon atom of a silole, SCPs with silole pendants, and hyperbranched or dendritic SCPs (Fig. 2), have been synthesized.10 In this chapter, the functionalities of SCPs, such as band gap, photoluminescence, electroluminescence, bulk-heterojunction solar cells, field effect transistors, aggregation-induced emission, chemosensors, conductivity, and optical limiting, are summarized. 

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