Stereoregular complex formation with hydrogen bonding between PLLA and PDLA enantiomers is more favorable than single types of PLLA or PDLA.
Nagai, "Infrared spectra of
stereoregular polymethyl methacrylate," Journal of Applied Polymer Science, vol.
NatureWorks' invention is a ring-opening catalyst to make
stereoregular, high-temperature PLA copolymers starting with this mix of D and L lactic acids.
The poly(methacrylic acid) derived from the above PTrMA with a high optical activity was confirmed to be highly isotactic as expected and completely optically inactive, indicating that the
stereoregular polymer could not maintain the helical structure without the bulky triphenylmethyl groups.
Firstly, bacterially synthesized P(3HB) and P(3HB-co-3HV) are completely isotactic
stereoregular polyesters; they have a high tendency to crystallize.
M, Kawakami, Y, Synthesis of
Stereoregular and Optically Active Polysiloxanes Containing l,3-Dimelhyl-l,3-diphenyldisiloxane as a Constitutional Unit," Macromolecules, 33 (6) 1960-1963 (2000)
Because of the
stereoregular structure of the polymer, natural rubber crystallizes when strained or when stored at low temperatures.
Together with his wife, Professor Jacqueline Jozefowicz, Marcel discovered that random copolymers containing the basic chemical function groups of heparin in the right proportion, can also exhibit heparin-like properties -- contrary to conventional theory that supposes only highly organized,
stereoregular surfaces are capable of molecular recognition.
Would people really be turned on by '
stereoregular polymers' and silicon chips?
Stereoregular PLA is crystallizable, such as poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA), whereas atactic poly (D, L-lactide) (PDLLA), randomly copolymerized from racemic lactide, is amorphous while a certain amount of counit is incorporated.
Tretinnikov, "Selective accumulation of functional groups at the film surfaces of
stereoregular poly(methyl methacrylate)s," Langmuir, vol.