Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Amphiphilic co-polymer network gel films based on tetra-poly(ethylene
  glycol) and tetra-poly({\epsilon}-caprolactone)   In order to allow the simultaneous transport of hydrophilic and hydrophobic
substances, polymeric networks with finely distributed hydrophilic and
hydrophobic components are very suitable. When designing new soft materials
like coatings, in addition to the structure in the volume phase, the structure
at the interface plays a critical role. In this study, two alternating
tetra-arm star polymers poly({\epsilon}-caprolactone) (tetra-PCL-Ox) and
amino-terminated poly(ethylene glycol) (tetra-PEG-NH2) form an amphiphilic
co-polymer network. They serve as a model system for controlling and
understanding the structure-property relationship at the interface of ACN gels.
The correlation between different synthesis strategies for gel films and their
resulting properties will be described. Through various spin coating
techniques, control over film thickness and roughness is achievable and
highlights differences to macroscopic gel samples. Atomic force microscopy
(AFM) measurements reveal the effect of solvents of different polarities on the
swelling ability and surface structure. This correlates with AFM investigations
of the mechanical properties on ACN gel films, demonstrating a strong effect on
the resulting elastic modulus E, depending on the presence or absence of a good
solvent during synthesis. Furthermore, a higher E modulus is obtained in the
presence of the selective solvent water, compared to the non-selective solvent
toluene. This observation is explained through selective swelling of the
tetra-arm star polymers displaying a different hydrophobicity.

25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con