Answer
In triglyceride, phosphate group is not present. While Phospholipid is triglyceride with the phosphate group, so that one end is hydrophilic and the other hydrophobic. The hydrophobic end stays inside the lipid bilayer, and the hydrophilic end stay outside Therefore triglyceridee can not form a lipid bilayer.
Work Step by Step
In triglyceride, phosphate group is not present. While Phospholipid is triglyceride with the phosphate group, so that one end is hydrophilic and the other hydrophobic. The hydrophobic end stays inside the lipid bilayer, and the hydrophilic end stay outside Therefore triglyceridee can not form a lipid bilayer.