Angular5 form表单验证

Question

ngOnInit() {

this.form = new FormGroup({
  email: new FormControl('[e-mail]', [Validators.required]),
  password: new FormControl()
});

预想效果

并未出现呀。
也为报错

         <mat-form-field class="full-width" >
          <input matInput type="text"  placeholder="Email" formControlName="email" value="">
        </mat-form-field>