## 1 Introduction  
Beyond a doubt, the glass transition temperature (\(T_{\rm g}\)) is one of the most important characteristics of polymers. Since the \(T_{\rm g}\) is the temperature at which a polymer undergoes a transition from a glassy state to an elastic (viscoelastic) state, which results in substantial changes in its physical properties, such as elasticity, strength, and stiffness, it is a critical factor for both polymer processing and applications. As a consequence, the effect of structure, topology (i.e., linear, branched, and crosslinked) and the molecular weight of macromolecules on their \(T_{\rm g}\) has been widely investigated since the beginning of polymer science, technology, and production. One of the recently emerging classes of crosslinked polymers belongs to contexts, which are composed of different polymer chains coupled with chemical bonds to each other (see e.g., Refs. [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73] and references therein. In these macromolecular assemblies, two or more polymer chains, which are mostly immiscible, are crosslinked either by covalent, ionic, or supramolecular bonds. Due to the mobility restriction of the crosslinked macromolecules, conetworks with nanophasic morphology are obtained in the cases of immiscible polymer components [13, 14, 15, 16, 27, 28, 51, 52, 53, 56, 61, 68, 73]. These conetworks usually have a bicontinuous (coconntuous) structure with a broad composition window [13, 14, 28, 53, 61, 73]. Due to the unique bicontinuous nanophase separated structure and component-selective swelling behavior of polymer conetworks, these materials offer advanced applications in various fields, such as sensors [5, 6, 7], self-healing materials [10, 11, 40, 60], membranes [24, 25, 26], drug delivery [33, 34, 35, 61, 62, 63], ophthalmic devices [45, 46], catalyst supports [47, 48, 49], etc. Although the glass transition temperature is a critical property of the amorphous macromolecular materials, not only from fundamental aspects but also from an application point of view, surprisingly, relatively few reports have dealt with the thermal transition behavior of the polymeric components in conetworks, i.e., \(T_{\rm g}\) and/or crystallization and melting temperatures [12, 13, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 70, 71, 72, 73]. Unexpectedly, in two cases, that is, for the poly(N-vinylimidazole)-\(l\)-poly(tetrahydrofuran) (PVIm-\(l\)PTHF) [12] and poly(methyl methacrylate)-\(l\)-polyisobutylene (PMMA-\(l\)PIB) [13] conetworks, a Fox-Flory-type correlation [74] was found between the \(T_{\rm g}\) of the crosslinked polymers, i.e., PVIm and PMMA, and the average molecular weight between crosslinking points (\(M_{\rm c}\)). This means that the \(T_{\rm g}\) decreases with decreasing \(M_{\rm c}\), that is, by increasing crosslinking density, according to the Fox-Flory equation for the \(T_{\rm g}\) dependence of homopolymers on the number average molecular weight (\(M_{\rm n}\)) [74]:  
\[T_{\rm g}=T_{\rm g,\infty}-\frac{K}{M_{\rm n}} \tag{1}\]  
where \(T_{\rm g,\infty}\), represents the glass transition temperature of the polymer with infinite molecular weight, and \(K\) is a constant. In the case of the mentioned examples [12, 13], this correlation is valid by substituting \(M_{\rm n}\) with \(M_{\rm c}\). Furthermore, it was found for the PMMA-\(l\)-PIB networks that the \(K\) value fits well with that of the PMMA homopolymers in the same molecular weight region [13]. These findings fully contradict expectations, because it is well known that increasing the crosslinking density leads to increasing the \(T_{\rm g}\) in polymer networks crosslinked with crosslinkers of low molecular weights [75, 76, 77], on the one hand.