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Study on chain extension and modification of poly(lactic acid) by isophorone diisocyanate/polyethylene glycol Zhang Zhao1, a, Fan Guodong*1,b and Yang Haiyan1,c 1Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi'an 710021, China azhangzhao@sust.edu.cn, bfangd@sust.edu.cn, c06yanghaiyan@sust.edu.cn Keywords: poly(lactic acid); polyethylene glycol; isophorone diisocyanate; direct melt copolycondensation; chain extension.
FTIR was used to characterize the chemical structure of polymer and were recorded in the transmittance range of 4000-400 cm-1 using a IR Prestige-21 spectrometer.
Progress in Chemistry Vol. 12(1) (2000), p. 89.( In Chinese) [2] S.

The structure of the samples were characterized by X-ray diffraction (Rigaku D/MAX-RB)with a Cu kα radiation.
Industrial and Engineering Chemistry Research. 2011,50(5): 2659-2664
Journal of Solid State Chemistry. 2011,184(11): 3050-3054.

If we reduce the removal unit in machining, work material may be wiped off at atomic level like chemistry machining [5].
And the removal process will be dominated by the surface atomic structure instead of characteristic of the work material.
There is an important free radical in the colloid called hydroxide radical OH, which possesses strong reacting capacity to catalyze chemistry reaction with surface atom or other radical [7].

In the future, a major direction to the development of polymer composites is finding out the simple structure-property relationship.
Wang, Materials Chemistry and Physics, 92 (2005), 361-365
Manias, Chemistry of Materials, 12 (2000), 2943-2949

The structure of circuit is shown by Figure 2.
Journal of Electroanalytical Chemistry and Interfacial Electrochemistry,2009, 631(1) :10-21
SCIENCE CHINA Chemistry, 2010,53(12):2581-2586.

Membranes prepared from a blend of poly(acrylic acid) and Natural rubber-graft-poly(vinyl alcohol) (PAA/NR-g-PVA) Wilairat Wongthepa , Chaiwat Ruksakulpiwatb and Sittipong Amnuaypanichc* Applied Chemistry Division, Department of Chemistry, Facultry of Science, Khon Kaen University, Khon Kaen, 40002 Thailand.
Under low water concentration (< 30 vol.%), the carboxylic groups of PAA are unassociated; therefore the intra- and intermolecular H-bonding among PAA chains are realized giving compact polymeric networks which causes the difficulty in intruding of ethanol and water molecules into the membrane structure.

Alternatively, because the path is tortuous when water-soluble species in hardened cement pastes are leached by their transport through the porous cementitious structure in response to a chemical potential gradient, this transport is usually slow [5].
Taylor: Cement Chemistry, 2nd Edition (Thomas Telford Publishing, New York, USA, 1997)
Li: The Handbooks for Experimentalist in the Chemistry and Chemical Area (Dalian University of Technology press, Dalian, China, 1996).

Chuanxiong polysaccharide mainly to the antioxidant activity of specific fractions and structure-activity relationship needs further study
(2) Biological materials or biomedical polymer material is formed by the cross by the life sciences, materials science and polymer chemistry Research, it is a functional polymer, the most important and fastest-growing areas, the forefront of polymer science.
The efficiency of flavonoids in polar extracts of lycium chinense mill fruits as free radical scavenger[J].Food Chemistry, 2004, 87(2): 283-288 [2] BONDET V, BRAND -WILLIANS W, BERSET C.

Owing to the physical (prevents adhesion), chemical (enables tribo-chemical reactions) and microstructural (lamellar structure with low shear strength) influence of solid lubricants on a tribological contact of working surfaces, they are effective in reducing friction and wear [6].
Upadhyaya: Materials Chemistry and Physics, Vol. 67 (2001), p1
Kapur, Pradip: Materials Chemistry and Physics, Vol. 67 (2001), p17

The molecular structure of the super-absorbent resin was confirmed by FTIR.
Introduction Super absorbent polymers with a three dimensional cross-linked structures are a new type of functional polymer that has been developed in recent years.
The molecular structure of the super-absorbent resin was confirmed by FTIR.
Results and Discussion Chemical structure of Super-absorbent Resin.The FTIR spectra of super-absorbent resin was shown in Fig.1.
FTIR was used to confirm the molecular structure of the super-absorbent resin.