Mechanical and Thermal Properties of Poly(urethane urea) Nanocomposites Prepared with Diamine-Modified Laponite

Table 1

Mechanical properties and endotherms of PUU nanocomposites.

Nanocomposite composition (mass% Silicate)	NH2 from particle^a (mole%)	Tensile strength (MPa)	Elongation at break^b (%)	Modulus 𝐸100^b (MPa)	𝑇𝑔^c (^∘C)	Endo^d 1 Peak, 𝑇 (^∘C)	Endo^d 2 Peak, 𝑇 (^∘C)
Neat PUU	0	16.7±1.7	501±34	11.1±1.2	−72	192	274
0.5 mass% DAML	0.8	33.0±3.9	604±17	11.7±0.9	−70	192	270
1 mass% DAML	1.7	48.8±1.4	716±40	11.6±1.0	−70	197	265, 277
1.5 mass% DAML	2.6	26.4±2.7	608±37	10.4±1.4	−69	192	273
3 mass% DAML	5.4	16.0±2.1	642±35	10.9±0.8	−68	188	277
1 mass% MAML	0	22.1±3.0	734±21	13.2±1.4	−68	189	271
1 mass% DAMC	1.7	28.4±0.7	751±36	10.3±0.6	−71	189	285

aMole%  -NH₂ groups contributed by particle out of total -NH₂ moles in sample.bError represents a 95% confidence level from at least 3 samples.cSoft segment glass transition temperature.dEndo means endothermic.