A Guiding Principle for Strengthening Crosslinked Polymers: Synthesis and Application of Mobility‐Controlling Rotaxane Crosslinkers

Abstract

Three component mobility controlling vinylic rotaxane crosslinkers with two radically polymerizable vinyl groups (RC_Rs) were synthesized to prove that the mobility of the components of the RC_Rsp laysacrucial role in determining the properties of rotaxane-crosslinked polymers (RCPs). RC_Rs( R= H, Me,o rE t) were obtained from living ringopening polymerization. RCP_Et was prepared using RC_Et, which exhibits the lowest component mobility.T he low component mobility is reflected in inferior mechanical strength and stretching ability in tensile stress tests compared to components with good (R = Me) and high (R = H) mobility. However, RCP_Et exhibited significantly higher stress and strain values than the corresponding covalentlyc rosslinked polymers (CCP_Rs). These results indicate that as uitable component mobility substantially enhances the mechanical strength of RCPs.T his behavior could serve as ag uiding principle for the molecular design of advanced RCs.

Evaluation of the Chemical, Morphological and Dielectric Properties of Supramolecular Networks Consisting of Polyethylene Glycol Polyrotaxanes and Polystyrene/Semi‐Rotaxane with Hydroxypropyl‐β‐Cyclodextrins

“…[ 2–8 ] Nevertheless, these supramolecular materials can be adjusted to respond to different energy sources (electrical, mechanical, light, chemical, or thermal stimuli) that strongly recommend them for a variety of applications, such as smart and stimuli‐responsive materials, capacitors, sensors, and actuators. [ 9–14 ] In addition, the biocompatibility of poly(ethylene glycol) (PEG) and cyclodextrins (CDs) polyrotaxanes has great implications in the field of biomedical applications. [ 15–17 ] This strategy opens new opportunities to obtain a wide variety of such supramolecular networks, which leads to a better tendency to organize into homogeneous surface morphology in the solid state.…”

Implementation of the Pulley Effect of Polyrotaxane in Transparent Bulk Polymer for Simultaneous Strengthening and Toughening

“…Topologically interlocked hydrogels containing slidable crosslink junctions, which can equalize the applied stress under deformation, have attracted lots of attention. [1][2][3] The specific architecture used to be realized by rotaxane [4][5][6][7][8][9][10] or polyrotaxane (PR) components [11][12][13][14][15] assembled from α-cyclodextrins (α-CDs) host and linear macromolecular guest like polyethylene glycol (PEG). Due to the limitation of the complicated synthesis of crown-ether rotaxane, [8] polyrotaxane carrying α-CDs are mostly used.…”

Research on synthesis of polyurethane based on a new chain extender obtained from waste polyethylene terephthalate

“…Surprisingly, a very small weight (7.41 wt%) of BHET chain extender can dramatically increase the tensile strength of polyurethane up to 302% and the elongation of polyurethane up to 18.2%. This enhancement is attributable to the cross-linking network effect and effective cooperative stacking network of hydrogen bonds, [52][53][54] which enhances the mechanical strength and elastic strength of all current polyurethane materials.…”