Structure and properties of polynorbornene derivatives: Poly(norbornene dicarboxylic acid dialkyl ester)s and poly(norbornene dimethyl dicarboxylate)s

Palladium(II)-catalyzed addition polymerizations of nadimides with linear alkyl and alicyclic pendant groups

“…As a means of achieving these targets, we reported a series of functionalized PNBs bearing dimethyl carboxylate groups, polymerized by a Pd(II) complex associated with weak SbF À 6 counter ions. As expected, the PNBs bearing dimethyl carboxylate groups showed good solubility in common organic solvents; however, their thermal stability ($360°C at 5% weight loss) and dielectric properties (k = 3.0-3.5) were worse than those seen for the unsubstituted PNB [11]. These deficiencies impelled us to design new kinds of functional NB derivatives.…”

“…In contrast to our Table 1 Results of vinyl polymerization of N-substituted-exo-norbornene-5,6-dicarboximides by palladium-based catalyst. Polymerization conditions: dichloroethane solvent = 6.0 mL; di-l-chloro-bis(6-methoxynorbornene)-palladium complex = 1.5 Â 10 À4 mol (8.0 mg); AgSbF 6 previous work on the polymerization of norbornene-2,3-dimethyl carboxylates [7,11], the PrNDI polymerization yield increases from 58% (at 20°C) to 79% (at 40°C) with the increase of temperature, demonstrating a relatively higher thermal stability of the active centers. The molecular weight of the polyPrNDI increases with the increase in polymerization time and the decrease in temperature, although no notable statistically significant trends were observed.…”

Recent advances in electrochromic polymers

“…The ring-opening metathesis polymerisation (ROMP) method could control the stereoregularity [51] and cis-trans content [52], produce a high molecular weight [53], and allow the formation of block copolymers [54] and terminal functionalities [50]. The ROMP method also offers the possibility of producing polymers with controlled molecular weights and low polydispersity.…”

“…Moreover, the polymerisation of endo-functionalised norbornenes is more difficult than that of exo-functionalised norbornenes because the endo-functionalised norbornene could coordinate more strongly with the catalyst compared with the exo counterpart. Other routes of polymerisation include cationic or radical and vinyl-type polymerisation [53].…”

Terpolymerization of carbon monoxide, styrene, and 4-methylstyrene catalyzed by palladium-rare earth catalyst

“…2 Until recent decades, the copolymer with strictly alternative structure synthesised by CO and styrene obtained by the transition metal catalyst have been mainly discussed. 3,4 However, like many others polymer with the highly stereospecific structure, 5 it results the high melting temperature and brings huge trouble to the product processing. Furthermore, with the noble metal palladium as a main catalyst, the high cost also impedes the industrialization of polyketone synthesis.…”