Livewire don't send request to bind the textarea

why in this case i cant bind textarea in to the $input livewire don't send any request!?

                            @auth
                                @include('layouts.errors')
                                <form wire:submit.prevent="sendComment">
                                    <div class="form-group my-4">
                                        <label for="comment" class="p-r-mute">leave a comment</label>
                                        <textarea id="comment" wire:model="input" class="form-control" placeholder="type.." rows="4" required></textarea>
                                    </div>
                                    <button type="submit" class="btn-get-primery">send</button>
                                </form>
                            @endauth

class :

class SingleSerial extends Component
{
    public $model;
    public $input;
    public $parent_id = '0';

    public function mount(Series $seriesSlug)
    {
        $seriesSlug->increment('viewCount');
        SEO::setTitle(strip_tags($seriesSlug->title));
        SEO::setDescription(strip_tags(str::limit($seriesSlug->body , 250)));
        SEOMeta::setKeywords(strip_tags($seriesSlug->keyWords));
        OpenGraph::addProperty('type', 'Series');
        OpenGraph::addImage(asset('storage/'.$seriesSlug->imageUrl));
        $this->model = $seriesSlug;
    }

    public function render()
    {
        return view('livewire.single.single-serial' , [
            'comments' =>  $this->model->comments()->where('approved' , 1)->where('parent_id', 0)->latest()->with('comments')->paginate(15)
        ]);
    }
}