Development of a semi-crystalline hybrid polyurethane nanocomposites for hMSCs cell culture and evaluation of body- temperature shape memory performance and isothermal crystallization kinetics

A novel multi‐functional model thermoset and PDA‐coated PU nanocomposite based on graphene and an amphiphilic block copolymer

“…12 Regarding the high-temperature region, the storage modulus of the synthesized for hard segments, which are covalently bonded to the graphene nanoplatelets. 16 The melting temperature (T m ) of the soft domain chains can be determined from a 1-1.5 order of magnitude decline in E' after the plateau region. 9 As indicated by blue arrows in Figure 3A…”

“…For semi-crystalline thermoset PUs, the characteristic crystallization and melting temperatures (T c and T m , respectively) and the crystallization extent are the main factors that affect the stimuliresponsive behavior. 16,17 Crystallization of semi-crystalline polymers is controlled by their configurational order (thermodynamics) and the ability to form crystallite nuclei and its growth (kinetics). Formation of tPU structures highly limits the crystallization of soft segments as the mobility of the segments are limited in the chemical network structure.…”

“…[13][14][15] However, with respect to tPU nanocomposites, the onepot synthesis procedure removes the need for extra processes and the possibility of nanoparticle migration and clustering. 16,17 In recent years, PUs with relatively more complex structures have emerged indicating the attempt to develop biomaterials with a multi-purpose role. 18,19 Preparation of macroporous TPU/hydroxyapatite (HA) nanocomposites modified with Polydopamine (PDA), 20 synthesis of tPUs of PCL/PEG and cellulose nanocrystals (CNCs) 11,12,17 are recent examples of these attempts.…”

“…Besides that, biocompatible PUs are not widely available 13–15 . However, with respect to tPU nanocomposites, the one‐pot synthesis procedure removes the need for extra processes and the possibility of nanoparticle migration and clustering 16,17 . In recent years, PUs with relatively more complex structures have emerged indicating the attempt to develop biomaterials with a multi‐purpose role 18,19 .…”

Synthesis of waterborne polyurethane nanocomposite adhesives of bio‐based polyol from rapeseed cake residual and cellulose nanowhisker

“…Polyurethanes (PUs) are segmented block copolymers of a polyol, also known as soft segment with relatively low glass transition temperature ( T g ), and a urethane linkage, also known as hard segment which possess a higher T g relative to the soft segments 1 . The higher T g of the hard segments (HSs) originates from their chemical composition (R NHC[═O]O R') with high intermolecular hydrogen bonding 2 . The difference in chain dynamics between these two covalently bonded blocks results in a microphase segregation, which renders PUs properties of a filled matrix including high toughness and flexibility 3 .…”