Chitosan- and polypropylene-oriented surface modification using excimer laser and their biocompatibility study

Figures & data

Figure 1. Topography of polymers modified by laser radiation. Chitosan (A: non-modified surface, B: modified & non-oriented surface, C: modified & oriented surface), and polypropylene (D: non-modified surface, E: modified & non-oriented surface, F: modified & oriented surface).

Table 1. The amount of RMS (roughness) for polymeric samples.

Sample	Non-modified Chitosan	Modified Chitosan	Modified and oriented Chitosan	Non-modified polypropylene	Modified polypropylene	Modified and oriented polypropylene
RMS (nm)	19.215	112.35	151.214	18.049	22.258	41.283

Table 2. Contact angles of normal and irradiated samples (average).

Sample	Non-modified Chitosan	Modified Chitosan	Modified and oriented Chitosan	Non-modified polypropylene	Modified polypropylene	Modified and oriented polypropylene
Contact angle (deg)	51	36	20	99	76	68

Figure 2. The MTT assay result for rate of proliferation of cells on different samples. Non-modified chitosan and PP, Modified chitosan and PP, Modified & oriented chitosan and PP and Control (TCPS).