Crystal nucleating agents, crystalline polymer composition, methods of manufacture thereof, and articles thereof

A polymer composition having a degree of orientation equal to or greater than 0.01 when measured by a method comprising:

• heating a press-molded test piece having a width of 10 millimeters, a length of 20 mm, and a thickness of 0.7 mm at a temperature 29° C. greater than the melting point of the polymer composition for 3 minutes;
• cooling the press-molded test piece to a temperature 9° C. greater than the melting point of the polymer;
• elongating at a Hencky rate of 1 s−1 for 2 seconds, unless the press -molded test piece is broken, in which case the press-molded test piece is elongated for 1 second;
• maintaining the elongated condition for 300 seconds;
• quenching the press-molded test piece;
• and
• determining a degree of orientation from an azimuthal angle distribution of diffraction intensities corresponding to an a00 plane and a 0b0 plane, when measured by two-dimensional X-ray diffraction, wherein the polymer composition comprises a first polymer comprising
• a first monomer unit derived from a monomer of Formula A:
• (R1SiO1.5)x(R2SiO1.5)y Formula A
• wherein
• R1 is a polymerizable functional group,
• R2 is a non-polymerizable group, and
• x is a positive integer and y is a positive integer, provided that x+y=2n, wherein
• n is an integer greater than or equal to 3;
• and
• a second monomer unit copolymerizable with the first monomer unit;
• wherein the content of the monomer unit of Formula A is 4 wt % of less, based on the total weight of the polymer components of the polymer composition.