On Polymer Nanocomposites - Progress in Organic and Physical Chemistry: Structures and Mechanisms - page 233

By direct measurements it is established that additives of powders nc-Si have re-
duced a polyethylene transparency in all investigated range of lengths of waves, but
especially strong transmittance decrease (almost in 20 times) is observed in a range
of lengths of waves of 220-400 nm, that is in UV areas. Especially strongly effect of
suppression UV of radiation is expressed in LDPE ¿ lm + 0.5% nc-Si-97 though con-
centration of an additive of silicon in this material is less. It is possible to explain this
fact to that according to experimentally received function of density of distribution of
the size the quantity of particles with the sizes is less 10 nm on volume/weight unit in
a powder nc-Si-97 more than in a powder nc-Si-36.
Direct measurements de¿ ne mechanical characteristics of the received ¿ lms-dura-
bility at a stretching and relative lengthening at disrupture (Table 1). The received re-
sults show that additives of powders of silicon raise durability of ¿ lms approximately
on 20% in comparison with pure polyethylene. Composite ¿ lms in comparison with
pure polyethylene also have higher lengthening at disrupture; especially this improve-
ment is expressed in case of composite PE + 0.5% nc-Si-97. Observable improvement
of mechanical properties correlates with degree of crystallinity of ¿ lms and the aver-
age sizes of crystal blocks in them (Table 2). By results of the X-ray analysis the high-
est crystallinity at LDPE ¿ lm + 0.5% nc-Si-97, and at it the smallest size the crystal
ordered areas that should promote durability and plasticity increase.

KEYWORDS

• Amorphous phase

• Nanocrystalline silicon

• Nanocrystals

• Nanoparticles

• Transmission electron microscopy

ACKNOWLEDGMENT
This work is supported by grants RFBR ʋ 10-02-92000 and RFBR ʋ 11-02-00868
also by grants FCP “Scientific and scientific and pedagogical shots of innovative Rus-
sia”, contract ʋ 2353 from 17.11.09 and contract ʋ 2352 from 13.11.09.

REFERENCES
1. Karpov, S. V. and Slabko, V. V. Optical and Photophysical Properties of Fractally Structured
Metal Sols . Sib. Otd. Ross. Akad. Nauk, Novosibirsk (2003).
2. Varfolomeev, A. E., Volkov, A. V., Godovskii, D. Yu., et al. Pis'ma Zh. Eksp. Teor. Fiz. , 62 , 344
(1995).
3. Delerue, C., Allan, G., and Lannoo, M. J. Lumin ., 80 , 65 (1999).
4. Soni, R. K., Fonseca, L. F., Resto, O., et al. J. Lumin ., 83-84 , 187 (1999).
5. Altman, I. S., Lee, D., Chung, J. D., et al. Phys. Rev. B Condens. Matter Mater. Phys . 63 , 161402
(2001).
6. Knief, S. and von Niessen, W. Phys. Rev. B: Condens. Matter Mater. Phys ., 59 , 12940 (1999).
7. Olkhov, A. A., Goldschtrakh, Ɇ. Ⱥ., and Ischenko, A. A. RU Patent ʋ 2009145013 (2009).