Preparation and application of low-molecular-weight poly(vinyl chloride). V. Preparation and characteristics of blended poly(vinyl chloride) by two-step suspension polymerization

Poly(vinyl chloride) (PVC) with relatively broader molecular weight distribution (BMD‐PVC) was prepared by two‐step suspension polymerization: (1) preparation of poly(vinyl chloride) with relatively higher molecular weight (HMW‐PVC) and (2) successive preparation of poly(vinyl chloride) with relatively lower molecular weight (LMW‐PVC) in the presence of the resultant HMW‐PVC and 2‐mercaptoethanol as a chain transfer agent. Some properties of BMD‐PVC were investigated: fusion time, melt viscosity, discoloration time, tensile strength at yield, tensile modulus in tension, and elongation at break. © 1994 John Wiley & Sons, Inc.